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Journal articles on the topic "Otoliti"
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Jawad, Laith, Pierre Gnohossou, and Ayoko Géraldine Tossou. "Bilateral asymmetry in the mass and size of otolith of two cichlid species collected from Lake Ahémé and Porto-Novo Lagoon (Bénin, West Africa)." Anales de Biología, no. 42 (March 25, 2020): 9–20. http://dx.doi.org/10.6018/analesbio.42.02.
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Asimetría bilateral en la masa y el tamaño de otolitos de dos especies de cíclidos capturados en el lago Ahémé y la laguna de Porto Novo (Benín, África Occidental) Se estudia la asimetría de la masa del otolito sacular en dos especies de peces cíclidos Sarotherodon melanotheron y Coptodon guineensis recolectadas del lago Ahémé y la laguna Porto-Novo, Benín, África occidental. La longitud y el ancho de los otolitos de especímenes adultos de ambas especies se usaron para calcular la asimetría fluctuante en estos dos caracteres. Los resultados muestran que el nivel de asimetría del ancho del otolito es el más importante. La posible causa de la asimetría en estas especies se ha discutido en relación con diferentes contaminantes en el área. Nuestros datos no muestran diferencias significativas, aunque varios estudios demostraron una asimetría más alta en individuos más grandes (de más edad). Saccular otolith mass asymmetry is studied in two cichlid fish species Sarotherodon melanotheron and Coptodon guineensis collected from Lake Ahémé and Porto-Novo Lagoon, Bénin, West Africa. The length and width of otoliths from adult specimens of both species were used to calculate the fluctuating asymmetry in these two characters. The results show that the level of asymmetry of the otolith width is the most important. The possible cause of the asymmetry in these species has been discussed in relation to different pollutants in the area. Our data show no significant difference, although several studies proved a higher asymmetry in larger (older) individuals.
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Umar, Yulianti, Fransine B. Manginsela, and Ruddy D. Moningkey. "Otolith And Growth Pattern Layang Fish, Decapterus Muroadsi Temminck & Schlegel, 1844 In Manado Bay." JURNAL ILMIAH PLATAX 7, no. 1 (October 30, 2018): 27. http://dx.doi.org/10.35800/jip.7.1.2019.21441.
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The aim of this research is to know the distribution of the size of Decapterus muroadsi, to describe otolit that is otolith length (Po), width otolith (Lo), perimeter / otolith circumference (Ko), otolith area (Ao), and determine the relationship of total length and body weight of fish kite Decapterus muroadsi in Manado Bay. The sampling was conducted in August - December 2017 of the gliders obtained during the study of 135 individuals in which males were 87 individuals and 48 female individuals. Distribution of the total length of the globe and the body height of the globe fish 190 mm - 225 mm, weighs 63 grams - 154 grams, the female fish has a total length of 205 mm - 250 mm, and weighst 88 grams - 159 grams. To know the morphometric perimeter otolith left and right perimeter otolith fish taken to be taken as otolith samples of male fish (15 individuals) and females (15 individuals). The results of the comparison analysis were found for the left and right otolith of male trooper with otolith length (Po) 0.796, perimeterr / otolith circumference (Ko) 0.621, and otolith area (Ao) 0.268 and females with 0.027 otolith (Po) 0.057, perimeter / otolith (Ko) 0.231, and otolith area (Ao) 0.858, males and females did not differ significantly between left otolith and right otolite where t-hit <from t-table as for otolith (O2) 2,371 and otolith otolith otolith (Lo) 2,952 differs markedly where t-hit> from t-table. Kites, Decapterus muroadsi used as a sample in the study were 135 individuals divided into 3 parts, namely males and females and combined (males and females). Based on the result of growth pattern analysis on the value of the fish b of the Decapterus muroadsi male has t-hit> t-table (4E - 06> 1,998) and mixed (and female) have t-hit> t-table (4E-06 - 1,997) Therefore H1 is accepted as (allometric) and females have t-hit <t-table (3E-O6-1,679) has a value b where hypothesis H1 is accepted as isometric. Keywords: Decapterus muroadsi, Describing, Otolith, male, females ABSTRAKPenelitian ini bertujuan untuk mengetahui sebaran ukuran ikan layang Decapterus muroadsi, mendeskripsikan otolit yakni panjang otolit (Po), lebar otolit (Lo), perimeter/keliling otolit (Ko), area otolit (Ao), dan menentukan hubungan panjang total dan berat tubuh ikan layang Decapterus muroadsi di Teluk Manado. Pengambilan sampel ini dilakukan pada bulan Agustus – Desember 2017 ikan layang yang di peroleh selama penelitian sebanyak 135 individu di mana jantan 87 individu dan betina 48 individu. Sebaran ukuran panjang total ikan layang dan berat tubuh ikan layang jantan 190 mm – 225 mm, berat 63 gram – 154 gram, ikan layang betina memiliki panjang total 205 mm – 250 mm, dan berat 88 gram – 159 gram, Untuk mengetahui perimeter morfometrik otolit kiri dan kanan perimeter otolit ikan layang yang diambil untuk dijadikan sampel otolit ikan layang jantan berjumlah (15 individu) dan betina (15 individu). Hasil analisis perbandingan ternyata untuk otolit kiri dan kanan ikan layang jantan dengan Panjang otolit (Po) 0,796, perimeterr / keliling otolit (Ko) 0,621, dan area otolit (Ao) 0,268 dan betina dengan Panjang otolit (Po) 0,057, perimeter/keliling otolit (Ko) 0,231, dan area otolit (Ao) 0,858, jantan dan betina tidak berbeda nyata antara otolit kiri dan otolit kanan di mana t-hit < dari t-tabel adapun untuk otolit jantan lebar otolit (Lo) 2,371 dan otolit betina lebar otolit (Lo) 2,952 berbeda nyata di mana t-hit > dari t-tabel. Ikan layang, Decapterus muroadsi yang digunakan sebagai sampel dalam penelitian berjumlah 135 individu yang di bagi dalam 3 bagian yaitu jantan dan betina serta gabungan (jantan dan betina). Berdasarkan hasil analisis pola pertumbuhan terhadap nilai b ikan layang Decapterus muroadsi jantan memiliki t-hit> t-tabel (4E – 06 >1,998) serta campuran (jantan dan betina) memiliki t-hit> t-tabel (4E-06 – 1,997) Maka dari itu H1 di terima sebagai (allometrik) dan betina memiliki t-hit< t-tabel (3E-O6– 1,679) memiliki nilai b dimana hipotesis H1 diterima sebagai isometrik.Kata kunci : Decapterus muroadsi, mendeskripsikan, otolit, jantan, betina
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Curthoys, Ian S., J. Wally Grant, Christopher J. Pastras, Daniel J. Brown, Ann M. Burgess, Alan M. Brichta, and Rebecca Lim. "A review of mechanical and synaptic processes in otolith transduction of sound and vibration for clinical VEMP testing." Journal of Neurophysiology 122, no. 1 (July 1, 2019): 259–76. http://dx.doi.org/10.1152/jn.00031.2019.
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Older studies of mammalian otolith physiology have focused mainly on sustained responses to low-frequency (<50 Hz) or maintained linear acceleration. So the otoliths have been regarded as accelerometers. Thus evidence of otolithic activation and high-precision phase locking to high-frequency sound and vibration appears to be very unusual. However, those results are exactly in accord with a substantial body of knowledge of otolith function in fish and frogs. It is likely that phase locking of otolith afferents to vibration is a general property of all vertebrates. This review examines the literature about the activation and phase locking of single otolithic neurons to air-conducted sound and bone-conducted vibration, in particular the high precision of phase locking shown by mammalian irregular afferents that synapse on striolar type I hair cells by calyx endings. Potassium in the synaptic cleft between the type I hair cell receptor and the calyx afferent ending may be responsible for the tight phase locking of these afferents even at very high discharge rates. Since frogs and fish do not possess full calyx endings, it is unlikely that they show phase locking with such high precision and to such high frequencies as has been found in mammals. The high-frequency responses have been modeled as the otoliths operating in a seismometer mode rather than an accelerometer mode. These high-frequency otolithic responses constitute the neural basis for clinical vestibular-evoked myogenic potential tests of otolith function.
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Mogea, Djusty, Lawrence J. L. Lumingas, and Gybert Mamuaya. "Biometric Analysis of Otolith (Sagitta) for the Stock Separation of Skipjack Tuna Katsuwonus pelamis (Linnaeus, 1758) Landed at Tumumpa Coastal Fisheries Port Manado, North Sulawesi." JURNAL ILMIAH PLATAX 7, no. 2 (July 17, 2019): 401. http://dx.doi.org/10.35800/jip.7.2.2019.24124.
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Skipjack tuna, Katsuwonus pelamis (Linnaeus, 1758) is one of the most important species for Indonesian marine capture fisheries and is the third major species of capture fisheries in the world. This study aims to analyze the biometry of otolith (sagitta) of skipjack tuna caught with ‘soma pajeko’ (mini purse-seine) around FADs in the Sulawesi Sea. A total of 96 individuals of skipjack tuna measuring total length (TL) ranged between 232 and 625 mm and the average of TL was 419.64 mm (SD = 112.78 mm) were successfully taken otolith without defects. The length of otolith (OL) of the skipjack tuna ranged between 2.693 and 5.269 mm with an average of OL was 3.435 mm (SD = 0.602 mm). For both the size and shape indices of the otolith, there were no significant difference between the left and right otoliths for otolith length (OL), otolith perimeter (OP), Form-Factor (FF) and Roundness (Rnd), but asymmetric influences were very significance for otolith width (OW), otolith area (OA), Circularity (Cir), Rectangularity (Rec), Ellipticity (Ell) and Aspect Ratio (AR). There were no significant difference in the mean size and shape indices of the otolith between females and males. The relationship between TL - OL follows the power function: OL = 1.027993 * TL0.198863 (R2 = 13.18%). The low value of R2 seems to be due to the mixing of more than one stock of skipjack tuna in the sample. Separation of observation data in the relationship between TL - OL into two different stocks can increase the value of b or R2. It is possible for skipjack tuna in the Sulawesi Sea to consist of two different stocks. The separation of the two stocks can mainly be determined by the size of the otolith, the size of the otolith of stock 1 is relatively large compared to stock 2. The relationship of ln (TL) - ln (OL) stock 1 and stock 2 were ln (OL) = -2,282 + 0,610 * ln (TL) (n = 53; r = 0.91) and ln (OL) = -2,363 + 0.566 * ln (TL) (n = 43; r = 0.64). It is possible that stock 1 is the stock of the Indian Ocean and stock 2 is the stock of the Western Pacific Ocean. To test this hypothesis, genetic studies are needed.Keywords: otolith biometry, stock separation, Katsuwonus pelamis, Sulawesi SeaABSTRAKIkan cakalang, Katsuwonus pelamis (Linnaeus, 1758) merupakan salah satu spesies yang sangat penting untuk perikanan tangkap laut Indonesia dan merupakan spesies utama urutan ke-3 perikanan tangkap dunia. Penelitian ini bertujuan untuk menganalisis biometri otolit (sagitta) ikan cakalang yang tertangkap dengan ‘soma pajeko’ (mini purse-seine) di sekitar rumpon di Laut Sulawesi. Sejumlah 96 individu ikan cakalang berukuran panjang total (TL) 232 - 625 mm dan rata-rata TL 419,64 mm (SD = 112,78 mm) berhasil diambil otolitnya tanpa cacat. Otolit (kiri) ikan cakalang tersebut berukuran panjang (OL) 2,693 - 5,269 mm dengan rata-rata OL 3,435 mm (SD = 0,602 mm). Baik untuk ukuran maupun indeks bentuk otolit, tidak terdapat perbedaan yang nyata antara otolit kiri dan kanan untuk panjang otolit (OL), keliling otolit (OP), Form-Factor (FF) dan Roundness (Rnd), tetapi pengaruh asimetris untuk lebar otolit (OW), luas otolit (OA), Circularity (Cir), Rectangularity (Rec), Ellipticity (Ell) dan Aspect Ratio (AR) sangat nyata. Tidak terdapat perbedaan yang nyata rata-rata ukuran maupun indeks bentuk otolit antara betina dan jantan. Hubungan TL - OL mengikuti fungsi perpangkatan: OL = 1,027993*TL0,198863 (R2 = 13,18%). Rendahnya nilai R2 ini nampaknya disebabkan karena bercampurnya lebih dari satu stok ikan cakalang dalam sampel. Pemisahan data amatan dalam hubungan TL – OL menjadi dua stok yang berbeda dapat menaikkan nilai b maupun R2. Ikan cakalang yang terdapat di Laut Sulawesi ada kemungkinan terdiri dari dua stok yang berbeda. Pemisahan kedua stok tersebut terutama dapat ditentukan lewat ukuran otolitnya, stok 1 berukuran otolit relatif besar dibandingkan dengan stok 2. Hubungan ln(TL) – ln(OL) stok 1 dan stok 2 berturut-turut adalah ln(OL) = -2,282 + 0,610*ln(TL) (n = 53; r = 0,91) dan ln(OL) = -2,363 + 0,566*ln(TL) (n = 43; r = 0,64). Ada kemungkinan stok 1 merupakan stok Samudra Hindia dan stok 2 merupakan stok Samudra Pasifik Barat. Untuk menguji hipotesis ini diperlukan kajian secara genetik.Kata kunci: biometri otolit, pemisahan stok, Katsuwonus pelamis, Laut Sulawesi
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Taliawo, Rofino, Fransine B. Manginsela, and Nego E. Bataragoa. "Otolith Morphometrics of Selar Crumenophthalmus From Kema Strait." JURNAL ILMIAH PLATAX 6, no. 1 (January 31, 2018): 98. http://dx.doi.org/10.35800/jip.6.1.2018.18905.
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Otolith or ear stone of fish, known as a result of biomineralization which takes place in the body of the fish. In some studies, otolith used to estimate age and stock structure of the fish. The otolith was categorized into three types called sagitta, lagena and utrikulus and the most widely studied. This study was designed to describe the characteristics of the otolith of S. crumenophthalmus by implementing six index form descriptors.Tthe study also dimed at determinition the relationship of fish length and otolith length as well as otolith width . Linear regression approch was used to analyse the relationship of fish length and whole characteristics otolith . Those parameters were analysed using Excel and application R program ( the package the FSA ). The results show that otolith S.crumenophthalmus sagitta has 6 descriptor indicees thatt are as follow: 1) the irregular surface (from factor < 1), 2) comparison against a full round (roundness ≠ 1), no 3) (full circle-shaped circularity: 21), 4) do not form a perfect square (R ≠ 1) and 5 axis) changes of 28-29 and 6) form a somewhat elongated (aspect ratio > 1). The value index otolith form is showed ellipse.Based on the results of the analysis, the otolith left and right (length, width, perimeter, and area) otolith males S. crumenophthalmus has no different. Same alsois found on the case of males otolith, left and on right (long) females otolith S. crumenophthalmus does not differ except the width of the otolith, the area and perimeter size of a different otolith real. The relationship between the length size and width dimensions of otolith with the total length of the fish has a linear relationship. The second parameter of the linear relationship is marked by the determination coefficient values on otolith length varies between 0,56-0,62 and its width ranged from 0.49 to 0.69. For female fish, otolith lenght detemination coefficient varies between 0.27 and 0.25 to its width ranges from 0.15 to 0.19.Key words: S.crumenophthalmus, otolith Morfometrik, Gulf of Kema AbstrakOtolit atau batu telinga ikan dikenal sebagai hasil dari biomineralisasi yang berlangsung dalam tubuh ikan. Pada beberapa studi, otolit digunakan untuk mengestimasi umur ikan serta struktur stok. Dari tiga (3) organ otolit (sagitta, utrikulus dan lagena), yang paling banyak diteliti adalah otolit sagitta.Penelitian yang dilakukan bertujuan untuk mendeskripsikan karakter otolit ikan Selar crumenophthalmus (yang mengunakan 6 deskriptor indeks bentuk) dan menentukan hubungan panjang tubuh ikan dengan panjang otolit serta lebarnya.Hubungan ukuran otolit terhadap panjang total ikan dianalis mengunakan persamaan regresi linier sederhana. Alat yang digunakan untuk menganalisis bentuk serta hubungan otolit menggunakan aplikasi Excel serta program R package FSA.Dari hasil analisis, otolit sagitta ikan Selar crumenophthalmus memiliki 6 deskriptor indeks yang hasilnya adalah : 1) permukaan yang tidak teratur (from factor < 1), 2) perbandingan terhadap bulat penuh (roundness ≠1), 3) tidak berbentuk lingkaran penuh (circularity: 21), 4) tidak membentuk persegi sempurna (R≠1) dan 5) perubahan sumbu sebesar 28-29 serta 6) bentuk agak memanjang (aspect ratio >1). Dari nilai indeks bentuk tersebut, otolit Selar crumenophthalmus menunjukan bentuk yang elips.Berdasarkan hasil analisis, otolit kiri dan kanan (panjang, lebar, , perimeter area /luas) otolit jantan Selar crumenophthalmus tidak berbeda nyata. Sama halnya dengan otolit jantan, kiri dan kanan (panjang) otolit betina Selar crumenophthalmus tidak berbeda nyata, namun lebar otolit, area serta perimeter otolit berbeda nyata.Hubungan antara dimensi ukuran panjang dan lebar otolit dengan panjang total ikan memiliki hubungan linier. Hubungan linear kedua parameter tersebut ditandai dengan nilai koefisien determinasi pada panjang otolit ikan jantan bervariasi antara 0, 56- 0, 62 dan lebarnya berkisar antara 0,49 sampai 0,69. Untuk ikan betina, koefisien deteminasi panjang otolit bervariasi antara 0,25 sampai 0,27 dan lebarnya berkisar antara 0,15 sampai 0,19.Kata kunci: Selar crumenophthalmus, Morfometrik otolit, Teluk Kema
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Curthoys, Ian S. "Concepts and Physiological Aspects of the Otolith Organ in Relation to Electrical Stimulation." Audiology and Neurotology 25, Suppl. 1-2 (September 25, 2019): 25–34. http://dx.doi.org/10.1159/000502712.
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Background: This paper discusses some of the concepts and major physiological issues in developing a means of electrically stimulating the otolithic system, with the final goal being the electrical stimulation of the otoliths in human patients. It contrasts the challenges of electrical stimulation of the otolith organs as compared to stimulation of the semicircular canals. Electrical stimulation may consist of trains of short-duration pulses (e.g., 0.1 ms duration at 400 Hz) by selective electrodes on otolith maculae or otolithic afferents, or unselective maintained DC stimulation by large surface electrodes on the mastoids – surface galvanic stimulation. Summary: Recent anatomical and physiological results are summarized in order to introduce some of the unique issues in electrical stimulation of the otoliths. The first challenge is that each otolithic macula contains receptors with opposite polarization (opposing preferred directions of stimulation), unlike the uniform polarization of receptors in each semicircular canal crista. The puzzle is that in response to the one linear acceleration in the one macula, some otolithic afferents have an increased activation whereas others have decreased activation. Key Messages: At the vestibular nucleus this opposite receptor hair cell polarization and consequent opposite afferent input allow enhanced response to the one linear acceleration, via a “push-pull” neural mechanism in a manner analogous to the enhancement of semicircular canal responses to angular acceleration. Within each otolithic macula there is not just one uniform otolithic neural input to the brain – there are very distinctly different channels of otolithic neural inputs transferring the neural data to the brainstem. As a simplification these channels are characterized as the sustained and transient systems. Afferents in each system have different responses to stimulus onset and maintained stimulation and likely different projections, and most importantly different thresholds for activation by electrical stimulation and different adaptation rates to maintained stimulation. The implications of these differences are considered.
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Bahri, Saiful, Lawrence J. L. Lumingas, and Fransine B. Manginsela. "Otolith biometry analysis of betong fish, Selar crumenophthalmus (Bloch, 1793) (Teleostei: Carangidae) in Manado Bay, North Sulawesi." JURNAL ILMIAH PLATAX 6, no. 2 (October 8, 2018): 124. http://dx.doi.org/10.35800/jip.6.2.2018.21075.
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This study aims to examine whether there are differences in the size and shape of otolith both between sexes and between the sampling times of bigeye scad Selar crumenophthalmus in Manado Bay, North Sulawesi. Most of the otolith sizes and the otolith shape indices do not show any significant differences between left and right, some of which show statistically significant differences such as the otolith length and the indices of the roundness, ellipticity and aspect ratio of female fish at August 2017 and otolith length, otolith width and otolith perimeter of male fish at November 2017. The otolith sizes and shape indices do not differ between sexes but differ between sampling times ie August 2017 and November 2017. Otolith sizes such as length, width, area and perimeter and shape indices such as circularity and rectangularity can be used as indicators of stock determination. Other shape indices of otolith such as form factor, roundness, ellipticity and aspect ratio are not well used as stock determination. Most of the samples showed a negative allometric growth pattern, except in the sample of female fish sampled in November 2017 which showed an isometric growth pattern for all otolith size variables. There is no statistically significant difference in the regression line of the otolith sizes - total length between sexes, but there is a statistically very significant difference in the regression line between sampling times (months) where the otolith size is greater in November 2017 or in other words at the same length of fish, otolith sizes bigger in November 2017 than in August 2017. The otolith sizes and their relationship with the total length of the fish can be used for determining (separating) the stock of bigeye scad Selar crumenophthalmus. There is a possibility that the sample for August 2017 is a different stock with samples from November 2017.Key words: Selar crumenophthalmus, otolith, morphometry, stock identification, Manado Bay ABSTRACTPenelitian ini bertujuan untuk menguji apakah terdapat perbedaan ukuran dan bentuk otolit baik antar seks maupun antar waktu pengambilan sampel ikan selar betong Selar crumenophthalmus di Teluk Manado Sulawesi Utara. Sebagian besar ukuran serta indeks bentuk otolit tidak menunjukkan perbedaan yang nyata antara kiri dan kanan, beberapa di antaranya menunjukkan perbedaan yang nyata secara statistik misalnya ukuran panjang otolit serta indeks bentuk otolit ‘roundness’, ‘ellipticity’ dan ‘aspect ratio’ pada ikan betina Agustus 2017 dan ukuran panjang otolit, luas otolit dan keliling otolit pada ikan jantan November 2017. Ukuran dan indeks bentuk otolit tidak berbeda antar jenis kelamin tetapi berbeda antar waktu sampling yakni Agustus 2017 dan November 2017. Ukuran otolit seperti panjang, lebar, luas dan keliling otolit serta indeks bentuk seperti ‘circularity’ dan ‘rectangularity’ dapat digunakan sebagai indikator penentu stok. Indeks bentuk otolit lainnya seperti ‘form factor’, ‘roundness’, ‘ellipticity’ dan ‘aspect rasio’ kurang baik digunakan sebagai variable penentu stok. Sebagian besar sampel menunjukkan pola pertumbuhan alometri negatif, kecuali pada sampel ikan betina yang disampling pada November 2017 yang memperlihatkan pola pertumbuhan isometrik untuk semua variabel ukuran otolit. Tidak terdapat perbedaan garis regresi ukuran otolit - panjang total antar seks, tetapi terdapat perbedaan yang sangat nyata garis regresi tersebut antar waktu sampling (bulan) di mana ukuran otolit lebih besar pada bulan November 2017 atau dengan kata lain pada panjang ikan yang sama, ukuran otolit lebih besar pada bulan November 2017 dibandingkan dengan pada bulan Agustus 2017. Ukuran otolit serta hubungan regresi dengan panjang total ikannya dapat digunakan untuk penentuan (pemisahan) stok ikan selar betong Selar crumenophthalmus. Ada kemungkinan sampel bulan Agustus 2017 merupakan stok yang berbeda dengan sampel bulan November 2017.Kata kunci: Selar crumenophthalmus, otolit, morfometri, identifikasi stok, Teluk Manado
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Payan, Patrick, Anaick Edeyer, Hélène de Pontual, Gil Borelli, Gilles Boeuf, and Nicole Mayer-Gostan. "Chemical composition of saccular endolymph and otolith in fish inner ear: lack of spatial uniformity." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 277, no. 1 (July 1, 1999): R123—R131. http://dx.doi.org/10.1152/ajpregu.1999.277.1.r123.
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Fish otoliths provide a record of age, growth, and environmental influences. In both trout and turbot, spatial chemical investigation of the endolymph surrounding the otolith (sagitta) showed a lack of uniformity. Proteins, [Formula: see text], and Mg2+ were significantly more concentrated in the proximal (facing the macula) than distal zone, whereas the opposite was observed for K+ and total CO2(totCO2). Na+ concentration ([Na+]) was 20% higher in the proximal zone in trout but not in turbot. Total Ca and Cl− contents were uniformly distributed in both species. We propose that the endolymphatic gradients of protein and totCO2 concentration within the endolymph are involved in the otolithic biocalcification process. Microchemical analyses of otolith sections by wavelength dispersive spectrometry showed a lack of spatial uniformity in the K/Ca and Na/Ca ratios, whereas the Sr/Ca ratio was uniform. There is a clear relationship between endolymph and otolith [K+], but the interpretation of the results for [Na+] needs further investigation. Thus the lack of uniformity in the otolith composition must be taken into account when investigating otolith microchemistry.
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Jawad, Laith, and Kélig Mahé. "Fluctuating Asymmetry in Asteriscii Otoliths of Common Carp (Cyprinus carpio) Collected from Three Localities in Iraqi Rivers Linked to Environmental Factors." Fishes 7, no. 2 (April 15, 2022): 91. http://dx.doi.org/10.3390/fishes7020091.
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Otoliths, calcified structures in the inner ears, are used to estimate fish age, and their shape is an efficient fish stock identification tool. Otoliths are thus very important for the management and assessment of commercial stocks. However, most studies have used left or right otoliths, chosen arbitrarily without evaluation of the difference between these otoliths. In this study, the asteriscii otoliths from 263 common carp (Cyprinus carpio; Linnaeus, 1758) were sampled in three Iraqi rivers to test the potential asymmetry and the geographical effect on otolith growth from three measurements (length, width and weight), and on shape from two shape indices (ellipticity and form-factor). Among all asteriscii otolith features, there was significant fluctuating asymmetry between fish length and every otolith descriptor. At one fish length, the size and/or the shape of otoliths could be different between two individuals and/or between left and right asteriscii otoliths for the same individual. Moreover, the relationship between fish length and otolith shape/growth was significantly dependent on the studied geographical area and, more especially, the environmental effects as the water temperature and pH. Finally, the relationships between fish length and otolith shape indices showed that the otolith evolves into the elliptical shape during the life of the fish. To use the otolith shape, it is essential to take into account the developmental stage of individuals to integrate the ontogenetic effect. Our results highlight the importance of verifying potential otolith asymmetry, especially for the asteriscii otoliths (lagenar otoliths) before their use in fisheries research.
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Milošević, Dragana, Ana Pešić, Zdravko Ikica, Tamara Mitrović, and Nikola Paskaš. "Biometry of the sagittal otoliths for three demersal fish species from the Eastern Adriatic Sea (Montenegro)." Acta Adriatica 62, no. 2 (December 22, 2021): 171–82. http://dx.doi.org/10.32582/aa.62.2.5.
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The otolith morphology, biometry and otolith size and fish length relationship of three demersal fish species: red mullet Mullus barbatus, common pandora Pagellus erythrinus and hake Merluccius merluccius were examined. Based on otoliths relative sizes P. erythrinus and M. merluccius have Large otoliths, while M. barbatus has Small sagittal otoliths. The relationships between otolith variables and fish somatic growth were described by a linear function. All relationships were statistically highly significant (p<0.001). Otolith length (OL) was found to be the variable most strongly related to fish size, with 61.2 – 95.3 % of the variability, while otolith weight had the lowest coefficient of determination (r2). No differences were found neither between left and right otoliths, nor between male and female otoliths in these relationships. For all species studied the relationships of otolith length, height and weight against total fish length were all found to have positive allometry, indicating that the accretion of otoliths is relatively faster than increase in fish body size. The shape indices of form factor (FF), roundness (RD), aspect ratio (AR), circularity (C), rectangularity (R) and ellipticity (E) were calculated and the relationships between otolith length (OL) and shape indices were determined.
Dissertations / Theses on the topic "Otoliti"
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Stagioni, Marco <1974>. "Identificazione di possibili unita' di stock di Anguilla anguilla mediante analisi microchimica e morfometrica degli otoliti." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7015/1/Stagioni_Marco_tesi.pdf.
Full textAbstract:
L’anguilla europea, è una specie eurialina catadroma con un complesso ciclo biologico: l’area di riproduzione, unica, si trova molto distante da quella di distribuzione. La specie necessita di una gestione dello stock a fini conservazionistici. Il problema è europeo: lo stock è unico, distribuito in Europa e nell’Africa settentrionale, si riproduce in Atlantico ed è panmittico. C’è preoccupazione per il declino del reclutamento e delle catture di adulti. Lo scopo del progetto è di individuare possibili unità di stock nella penisola italiana. La ricerca è basata sullo studio degli otoliti mediante analisi morfometrica e microchimica. I contorni degli otoliti sono sottoposti ad analisi ellittica di Fourier per individuare eventuali gruppi. Gli otoliti sono stati levigati per effettuare: letture d’età, indagini microstrutturali al SEM delle fasi larvali, analisi microchimiche LA-ICP-MS del nucleo, studiarne l’origine e valutare l’ambiente di sviluppo. Le indagini morfometriche mostrano evidenti pattern ontogenetici, ma non legati ocorrelati alla località, sesso o anno di nascita. Le indagini microstrutturali hanno evidenziano l’alto contenuto organico nucleare, un pattern comune di crescita ed eventi chiave delle fasi larvali, con una media di 212 anelli giornalieri. La microchimica rivela che le larve si sviluppano in acque salate fino alla metamorfosi, poi migrano verso acque meno salate. Le analisi su campioni nati nello stesso anno, evidenziano due gruppi: individui di rimonta naturale e individui di ripopolamento. I profili nucleo bordo evidenziano la permanenza a salinità intermedie degli adulti. L’attività di ricerca si è dimostrata proficua dal punto di vista tecnico con la messa a punto di protocolli innovativi e con forti ricadute sulla riduzione dei tempi e costi d’analisi. Il debole segnale di possibili unità di stock andrà verificato in futuro mediante analisi più dettagliate discriminando meglio la storia di ogni singolo individuo.The European eel is euryhaline catadromous with a complex life cycle: spawning area, unique, is far from that of distribution. The species needs a stock management and its conservation. The problem is European: the stock is unique, distributed in Europe and North Africa, spawning in Atlantic Sea and is panmictic. There is concern about the decline of recruitment and catches of adults. The purpose of the project is to identify possible units of stock in the Italian peninsula. The research is based on the study of otoliths by morphometric and microchemical analyses . The otoliths contours are analyzed by elliptic Fourier function to discover any groups. Otoliths were polished to make: ageing, SEM microstructural investigations of larval stages, LA-ICP-MS microchemical analysis of the core to study the origin and along a transect core to edge to evaluate the development environment. Morphometric investigations show obvious ontogenetic pattern, but no location, gender or year of birth correlation. The microstructural investigations showed high organic content in the core, a common pattern of growth and key events of the larval stages, with an average of 212 daily rings. The microchemical reveals that the larvae develop into salt water until metamorphosis, then migrate to waters less salty. Analyses of samples born in the same year, showed two groups: wild and restocked. The profiles confirm that the adult stay in brackishwater. The development of innovative protocols and improved technics have guaranteed a strong reduction of time and cost of analysis. The weak signal of possible stock units will be further tested through more detailed analysis discriminating about the life history of each individual.
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Stagioni, Marco <1974>. "Identificazione di possibili unita' di stock di Anguilla anguilla mediante analisi microchimica e morfometrica degli otoliti." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7015/.
Full textAbstract:
L’anguilla europea, è una specie eurialina catadroma con un complesso ciclo biologico: l’area di riproduzione, unica, si trova molto distante da quella di distribuzione. La specie necessita di una gestione dello stock a fini conservazionistici. Il problema è europeo: lo stock è unico, distribuito in Europa e nell’Africa settentrionale, si riproduce in Atlantico ed è panmittico. C’è preoccupazione per il declino del reclutamento e delle catture di adulti. Lo scopo del progetto è di individuare possibili unità di stock nella penisola italiana. La ricerca è basata sullo studio degli otoliti mediante analisi morfometrica e microchimica. I contorni degli otoliti sono sottoposti ad analisi ellittica di Fourier per individuare eventuali gruppi. Gli otoliti sono stati levigati per effettuare: letture d’età, indagini microstrutturali al SEM delle fasi larvali, analisi microchimiche LA-ICP-MS del nucleo, studiarne l’origine e valutare l’ambiente di sviluppo. Le indagini morfometriche mostrano evidenti pattern ontogenetici, ma non legati ocorrelati alla località, sesso o anno di nascita. Le indagini microstrutturali hanno evidenziano l’alto contenuto organico nucleare, un pattern comune di crescita ed eventi chiave delle fasi larvali, con una media di 212 anelli giornalieri. La microchimica rivela che le larve si sviluppano in acque salate fino alla metamorfosi, poi migrano verso acque meno salate. Le analisi su campioni nati nello stesso anno, evidenziano due gruppi: individui di rimonta naturale e individui di ripopolamento. I profili nucleo bordo evidenziano la permanenza a salinità intermedie degli adulti. L’attività di ricerca si è dimostrata proficua dal punto di vista tecnico con la messa a punto di protocolli innovativi e con forti ricadute sulla riduzione dei tempi e costi d’analisi. Il debole segnale di possibili unità di stock andrà verificato in futuro mediante analisi più dettagliate discriminando meglio la storia di ogni singolo individuo.The European eel is euryhaline catadromous with a complex life cycle: spawning area, unique, is far from that of distribution. The species needs a stock management and its conservation. The problem is European: the stock is unique, distributed in Europe and North Africa, spawning in Atlantic Sea and is panmictic. There is concern about the decline of recruitment and catches of adults. The purpose of the project is to identify possible units of stock in the Italian peninsula. The research is based on the study of otoliths by morphometric and microchemical analyses . The otoliths contours are analyzed by elliptic Fourier function to discover any groups. Otoliths were polished to make: ageing, SEM microstructural investigations of larval stages, LA-ICP-MS microchemical analysis of the core to study the origin and along a transect core to edge to evaluate the development environment. Morphometric investigations show obvious ontogenetic pattern, but no location, gender or year of birth correlation. The microstructural investigations showed high organic content in the core, a common pattern of growth and key events of the larval stages, with an average of 212 daily rings. The microchemical reveals that the larvae develop into salt water until metamorphosis, then migrate to waters less salty. Analyses of samples born in the same year, showed two groups: wild and restocked. The profiles confirm that the adult stay in brackishwater. The development of innovative protocols and improved technics have guaranteed a strong reduction of time and cost of analysis. The weak signal of possible stock units will be further tested through more detailed analysis discriminating about the life history of each individual.
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D'Angelo, Maria Carolina. "Analisi dell'accrescimento giornaliero della Sardina pilchardus nel Canale di Sicilia." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8283/.
Full textAbstract:
Lo studio effettuato riguarda l’accrescimento giornaliero della Sardina pilchardus, (Walbaum, 1792) tramite la lettura degli anelli di crescita giornaliera negli otoliti. Nel Mediterraneo centrale il lavoro svolto è il primo di questo tipo su S. pilchardus. Il campionamento è avvenuto durante la campagna oceanografica "Anchevatir 2012", 69 otoliti sono stati estratti da esemplari con lunghezza totale compresa tra 7 ed 12.5 cm e successivamente sottoposti ad inclusione, sezionamento e levigatura per la realizzazione di sezioni sottili. Sull’intero campione è stata stimata l’età con due metodi: lettura degli anelli giornalieri sotto microscopio e conteggio dei microincrementi tramite analisi d’immagine. L’età stimata è compresa tra i 90 e 230 giorni, tuttavia la maggior parte degli individui presenta un’età tra i 120 e 150 giorni. Inoltre è stata determinata la data di nascita degli esemplari, avvenuta tra Dicembre 2011 e Febbraio 2012. In seguito è stata condotta un’analisi della media dell’ampiezza degli incrementi per descrivere i pattern di crescita giornaliera: l’andamento risultante è crescente con il procedere dell’età fino a circa il 50° giorno, poi si stabilizza fino al 150°, infine i valori medi decrescono. La backcalculation ha permesso di stimare il tasso di accrescimento giornaliero della lunghezza del corpo. Sono state analizzate tre serie distinte per data di nascita (Dicembre 2011, Gennaio 2012 e Febbraio 2012); queste hanno mostrato pattern di accrescimento analogo. La crescita iniziale stimata è di 0.2 mm/d, raggiunge 0.6 mm/d intorno al 40° giorno, ed oltre il 100° si è osservato un decremento nell’accrescimento giornaliero, soprattutto nella serie di Dicembre. Le differenze più rilevanti nei pattern delle tre serie mensili sono state riscontrate nei valori medi fra Dicembre e Febbraio. L’analisi della temperatura media superficiale ha permesso di ipotizzare che questa crescita maggiore degli individui nati in Febbraio sia collegata all’aumento di temperatura registrato da Marzo in poi. Tale risultato suggerisce che le condizioni ambientali e quindi i ritmi metabolici e d’accrescimento nei mesi successivi a Febbraio sono più favorevoli rispetto ai mesi invernali.
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D'Addelfio, Fabio. "Analisi morfometrica classica ed EFA (Elliptic Fourier Analysis) degli otoliti del genere Mullus in Alto - Medio Adriatico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9546/.
Full textAbstract:
L’obiettivo del presente lavoro di tesi è stato quello di analizzare i campioni di otoliti delle due specie del genere Mullus (Mullus barbatus e Mullus surmuletus) per mezzo dell’Analisi Ellittica di Fourier (EFA) e l’analisi di morfometria classica con gli indici di forma, al fine di verificare la simmetria tra l’otolite destro e sinistro in ognuna delle singole specie di Mullus e se varia la forma in base alla taglia dell’individuo. Con l’EFA è stato possibile mettere a confronto le forme degli otoliti facendo i confronti multipli in base alla faccia, al sesso e alla classe di taglia. Inoltre è stato fatto un confronto tra le forme degli otoliti delle due specie. Dalle analisi EFA è stato possibile anche valutare se gli esemplari raccolti appartenessero tutti al medesimo stock o a stock differenti.
Gli otoliti appartengono agli esemplari di triglia catturati durante la campagna sperimentale MEDITS 2012. Per i campioni di Mullus surmuletus, data la modesta quantità, sono stati analizzati anche gli otoliti provenienti dalla campagna MEDITS 2014 e GRUND 2002. I campioni sono stati puliti e analizzati allo stereomicroscopio con telecamera e collegato ad un PC fornito di programma di analisi di immagine.
Dalle analisi di morfometria classica sugli otoliti delle due specie si può sostenere che in generale vi sia una simmetria tra l’otolite destro e sinistro. Dalle analisi EFA sono state riscontrate differenze significative in tutti i confronti, anche nel confronto tra le due specie. I campioni sembrano però appartenere al medesimo stock.
In conclusione si può dire che l’analisi di morfometria classica ha dato dei risultati congrui con quello che ci si aspettava. I risultati dell’analisi EFA invece hanno evidenziato delle differenze significative che dimostrano una superiore potenza discriminante. La particolare sensibilità dell’analisi dei contorni impone un controllo di qualità rigoroso durante l’acquisizione delle forme.
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Traina, Anna <1979>. "Contributo allo studio del chimismo degli otoliti di Dicentrarchus labrax di allevamento : l’otolite come possibile tracciante ambientale." Doctoral thesis, Università Ca' Foscari Venezia, 2011. http://hdl.handle.net/10579/1102.
Full textAbstract:
In questo lavoro è stata studiata la composizione chimica di otoliti di Dicentrarchus labrax di allevamento al fine di verificare il possibile impiego degli otoliti come traccianti ambientali. Gli esemplari sono stati campionati da due allevamenti siciliani con caratteristiche diverse: l’allevamento “Ittica di Trappeto” situato nel Golfo di Castellammare (costa Nord) e l’allevamento “Sicilttica” di Licata (costa sud). Il primo è un tipo di allevamento off-shore in cui le gabbie sono poste lontano dalla costa e soggette ad un elevato idrodinamismo. Al contrario, il secondo impianto è di tipo in-shore in cui le gabbie si trovano all’interno dell’area portuale in cui il ricambio di acqua è sicuramente molto più limitato. In particolare, tramite ICP-AES (Inductively Coupled plasma Atomic Emission Spettrometry) sono state determinate le concentrazioni dei seguenti elementi: Sr, Fe, Mg, Ba, Cd, Mn e Zn; e tramite ICP-MS (Inductively Coupled plasma Mass Spectrometry) il gruppo dei Lantanidi (La,Ce, Pr, Nd, Sm, Eu, Gd, Tb, Gy, Ho, Er, Tm, Yb, Lu). Inoltre sono stati analizzati campioni d’acqua e di mangime prelevati nei due allevamenti. I risultati mostrano che le concentrazioni di Sr all’interno degli otoliti non differiscono significativamente nelle spigole dei due allevamenti distribuendosi in un simile intervallo. Fe, Mg, Mn e Cd mostrano invece concentrazioni maggiori a Licata mentre lo Zn è l’unico elemento che registra valori superiori negli otoliti dell’allevamento di Trappeto. L’analisi chimica dei mangimi mostra una maggiore concentrazione di Fe, Mg, Mn e Zn nei campioni di Licata. Le acque di Trappeto risultano arricchite soprattutto in Fe e Zn rispetto a quelle di Licata. Dai risultati ottenuti si può ipotizzare che il fenomeno di uptake degli elementi Fe, Mg, Mn e Cd all’interno degli otoliti sia influenzato sia alla elevata concentrazione degli stessi nell’acqua di mare o nei mangimi utilizzati e da possibili variazioni tipo endogeno dovuta all’eccessivo tasso metabolico nei pesci allevati. Tutti gli elementi studiati, tranne lo Sr sembrerebbero quindi essere influenzati dai parametri chimico-fisici che regolano le masse d’acqua all’interno dell’allevamento. Diversamente, la distribuzione di Sr all’interno dell’otolite, è probabilmente principalmente controllata dalla preferenziale incorporazione nei siti del Ca e quindi alla struttura dell’aragonite. L’ elevata concentrazione di Zn, all’interno degli otoliti di Trappeto può essere spiegata con sorgenti antropiche provenienti dagli insediamenti industriali (distilleria) che insistono nel Golfo di Castellammare e che scaricano i propri reflui a mare. Lo studio delle distribuzione dei lantanidi ha evidenziato che gli otoliti di Trappeto mostrano un “seawater-like pattern” suggerendo il possibile utilizzo dell’otolite come proxy per lo studio della chimica dei lantanidi in acqua di mare, inoltre le anomalie di Ce hanno dato indicazioni sulle condizioni ossigenazione dei due allevamenti. Lo studio della chimica dell’otolite ha consentito di distinguere gli esemplari provenienti dai due allevamenti (Licata e Trappeto) suggerendo che la distribuzione degli elementi in tracce nei carbonati biogenici, possa costituire un valido tracciante ambientale. Tale studio si inserisce all’interno di una più ampia tematica di ricerca sullo studio degli otoliti considerati importanti indicatori della “life history” di specie ittiche. Riteniamo comunque importante effettuare ulteriori approfondimenti mirati a verificare la possibile relazione tra le variabili dell’acqua (salinità, temperatura e chimismo dell’ambiente), la composizione mangimistica e la composizione chimica dell’otolite anche al fine di poter utilizzare gli stessi otoliti come discriminante per il monitoraggio delle condizioni ambientali d’allevamento.In this work we studied the chemical composition of otoliths of cultured Dicentrarchus labrax in order to verify the possible use of otoliths as environmental tracers. Specimens were sampled from two Sicilians farms with different characteristics: the farm "Ittica Trappeto" located in the Gulf of Castellammare (North Coast) and “ Sicilttica "Licata (South Coast). The first is an off-shore farm where the tanks are placed far from the coast, in a area characterized by high hydrodynamism. The second one is an in-shore farm where the tanks are located inside the port where the water is certainly much more limited. Particularly, we analyzed concentrations of Sr, Fe, Mg, Ba, Cd, Mn and Zn using ICP-AES (Inductively Coupled Plasma Atomic Emission Spettrometry); ICP-MS (Inductively Coupled plasma Mass Spectrometry) were used for determination of Rare Elements (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, GY, Ho, Er, Tm, Yb, Lu). Were also analyzed samples of water and food from the two farms. Results show that concentrations of Sr in the otoliths have a similar range of distribution and not significantly differ between the two farms. Fe, Mg, Mn and Cd show, however, higher concentrations in Licata and Zn is the only element witht an higher values in the otoliths from Trappeto. Chemical analysis of food shows an higher concentration of Fe, Mg, Mn and Zn in samples of Licata. Trappeto water is enriched mainly in Fe and Zn than that of Licata. Our results may suggest that the uptake in the otoliths of elements such Fe, Mg, Mn and Cd is influenced either from the high concentration of them in sea water or in the food and from an higher metabolic rate of cultured fishes. All the elements, except Sr, seems to be influenced by physical-chemical parameters that control water properties in the farm. On the contrary, distribution of Sr within otolith, is probably controlled by the preferential incorporation into the Ca sites, and so in the then the Aragonite structure. Elevated concentration of Zn in the otoliths of Trappeto can be explained by the anthropogenic sources. Indeed in the Gulf of Castellammare there is a industrial sites (distillery) that release their waste into the sea. The study of distribution of Rare Elements showed that the "seawater-like pattern of otoliths of Trappeto suggest the possible use of otolith as a proxy for the study of the chemistry of Rare Elements in seawater. Furthermore Ce anomalies gave indications of oxygenation conditions in the two farms. The study of chemistry of otoliths allowed to distinguish the specimens among the two farms (Licata and Trappeto) suggesting that the distribution of trace elements in biogenic carbonates, may be a useful environmental tracer. This study is part of a broader research on the study of the otoliths considered as important indicators of the “life history” of fish species. We believe, however, that further studies are required with the aim to verify the possible relationship between the variables of water (salinity, temperature and chemistry of the environment), food composition and chemical composition of otolith also in order to use the same otoliths for monitoring environmental conditions for breeding.
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Alia, Andrea. "Struttura di età del genere Mullus in Alto-Medio Adriatico mediante lettura di otoliti e frequenze di taglia." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9600/.
Full textAbstract:
Scopo di questo studio è la determinazione delle strutture di età delle specie Mullus barbatus e Mullus surmuletus, pescate in Alto-Medio Adriatico durante le campagne di ricerca MEDITS e GRUND mediante la lettura degli anelli stagionali degli otoliti e delle frequenze di taglia. I campioni di otoliti sono stati prima estratti e poi lavati con sonicatore e acquisiti al computer. Sono state successivamente prese le misure dei radius ed è stata fatta una prima lettura degli anelli. Un subcampione è stato poi scelto per applicare altri due metodi di lettura degli anelli: la bruciatura e la colorazione, preceduta dal taglio dell’otolite. Sono stati poi levigati e lucidati gli otoliti dei giovanili per un conto degli annuli giornalieri. L’analisi dati, svolta tramite il software Rstudio, ha permesso di calcolare non solo le strutture di età, ma anche di osservare le distribuzioni dei campioni per classi di profondità e latitudine, confrontare le strutture di taglia e calcolare le chiavi di età-lunghezza, l’accrescimento somatico con le relazioni lunghezza-peso e l’equazione di Von Bertalanffy e l’accrescimento dell’otolite tramite i rapporti radius-taglia e radius-età e il tasso di incremento dei radius. Infine sono stati anche confrontati i tre metodi di lettura degli anelli al fine di stabilirne il migliore. Le due specie hanno mostrato una grande maggioranza di individui di 1 e 2 anni, soprattutto nella zona settentrionale e centrale dell’area di studio a profondità entro i 100 m. Differenze specifiche sono poi state trovate nel confronto tra le strutture di taglia e le relazioni lunghezza-peso e per il tasso di accrescimento K dell’equazione di Von Bertalanffy. Alta poi è la correlazione tra la misura dei radius e la taglia e l’età. Diverso è anche il tasso degli incrementi dei radius tra primo-secondo anno e secondo-terzo anno.
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Marziliano, Lucia. "Gli otoliti dei Triglidae (Teleostei, Scorpaeniformes): un approccio innovativo allo studio comparativo della forma e della struttura cristallina." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2411/.
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Angileri, Paolo Maurizio Maria. "Struttura di età di nasello (Merluccius merluccius, Linnaeus, 1758) in alto-medio Adriatico mediante analisi degli otoliti e frequenza di taglia." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8090/.
Full textAbstract:
The aim of present study is to define the general framework of Merluccius merluccius population structure, to estimate the growth rate and to assess the recruitment dynamics of juveniles from Northern and Central Adriatic, through otoliths analysis.
The otoliths of hake specimens collected during the MedITS trawl survey in the 2012 in GSA 17, were cleaned and 102 otoliths out of 506 were embedded, sectioned, grindined and polished to obtain frontal and sagittal sections. The whole sample were analysed under stereomicroscope and optical microscope, with camera and connected to PC provided of an image analyses program.
The frequency analysis of size classes and age revealed that the species is dominated by hake with >200mm TL and > one year old. The fish average size of M. merluccius at the end of the first year of life is about 199 mm TL. Allometrics analyses between fish TL and Feret (major axis), MiniFeret (minor axis), Area, Perimeter, showed a direct proportionality among lengths.
Among the 88 otoliths sections analysed, the number of daily increments read ranged from 86 to 206, within 55 and 175mm TL range. The age estimate ranged from about 2-3 to 9 months and the growth rate from 20.99 to 27.15mm TL. The hatch-date distribution, obtained by back calculation, showed that the hatching occurs in November-March.
In conclusion, strong preventive measures are needed for hake adults because the success of this species seems to be linked to deep water ecosystem protection where big spawners dwell.
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Akin, Faith W. "Otolith Assessment." Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/2434.
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Mapp, J. "Morphometric otolith analysis." Thesis, University of East Anglia, 2015. https://ueaeprints.uea.ac.uk/59388/.
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Fish otoliths have long played an important role in sustainable fisheries management. Stock assessment models currently used rely on species specific age profiles obtained from the seasonal patterns of growth marks that otoliths exhibit. We compare methods widely used in fisheries science (elliptical Fourier) with an industry standardised encoding method (MPEG7 - Curvature-Scale-Space) and with a recent addition to shape modelling techniques (time-series shapelets) to determine which performs best. An investigation is carried out into transform methods that retain size-information, and whether the boundary encoding method is impacted be otolith age, performing tests over three 2-class otolith datasets across six discrete and concurrent age groups. Impact of segmentation methods are assessed to determine whether automated or expert segmented methods of boundary extraction are more advantageous, and whether constructed classifiers can be used at different institutions. Tests show that neither time-series shaplets nor Curvature-Scale-Space methods offer any real advantage over Fourier transform methods given mixed age datasets. However, we show that size indices are most indicative of fisheries stock in younger single-age datasets, with shape holding more discriminatory potential in older samples. Whilst commonly used Fourier transform methods generally return best results; we show that classification of otolith boundaries is impacted by the method of boundary segmentation. Hand traced boundaries produce classifiers more robust to test data segmentation methods and are more suited to distributed classifiers. Additionally we present a proof of concept study showing that high energy synchrotron scans are a new, non-invasive method of modelling internal otolith structure, allowing comparison of slices along near infinite numbers of virtual complex planes.
Books on the topic "Otoliti"
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1960-, Secor David H., Dean John M. 1939-, Campana Steven E. 1955-, Miller Anne B, Belle W. Baruch Institute for Marine Biology and Coastal Research., and International Symposium on Fish Otoliths: Research and Application (1st : 1993 : Hilton Head, S.C.), eds. Recent developments in fish otolith research. Columbia, S.C: Published for the Belle W. Baruch Institute for Marine Biology and Coastal Research by the University of South Carolina Press, 1995.
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Otoliths. 13 Pages: Otoliths. Edited by Mark Young. Rockhampton/Home Hill, Queensland, Australia: Otoliths, 2006.
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Fieled, Adam. Otoliths: 13 pages. Edited by Mark Young and Otoliths. Rockhampton/Home Hill, Queensland, Australia: Otoliths, 2006.
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Young, Mark, and Otoliths, eds. Otoliths: 11 pages. Rockhampton/Home Hill, Australia: Otoliths, 2019.
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Smale, Malcolm J. Otolith atlas of southern African marine fishes. Grahamstown, South Africa: J.L.B. Smith Institute of Ichthyology, 1995.
Find full textBook chapters on the topic "Otoliti"
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Tona, Yosuke, and Akiko Taura. "Otolith." In Regenerative Medicine for the Inner Ear, 67–74. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54862-1_8.
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Khalil, Michael. "Otolith." In Encyclopedia of Evolutionary Psychological Science, 1–2. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-16999-6_988-1.
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Khalil, Michael. "Otolith." In Encyclopedia of Evolutionary Psychological Science, 5648–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-19650-3_988.
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Thorrold, Simon R., and Stephen E. Swearer. "Otolith Chemistry." In Reviews: Methods and Technologies in Fish Biology and Fisheries, 249–95. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-5775-5_8.
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Sans, A., C. J. Dechesne, and D. Demêmes. "The Mammalian Otolithic Receptors: A Complex Morphological and Biochemical Organization." In Otolith Function and Disorders, 1–14. Basel: KARGER, 2000. http://dx.doi.org/10.1159/000059109.
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Brandt, T. "Otolithic Vertigo." In Otolith Function and Disorders, 34–47. Basel: KARGER, 2000. http://dx.doi.org/10.1159/000059110.
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Berthoz, A., and D. Rousie´. "Physiopathology of Otolith-Dependent Vertigo." In Otolith Function and Disorders, 48–67. Basel: KARGER, 2000. http://dx.doi.org/10.1159/000059111.
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O¨dkvist, L. "Clinical and Instrumental Investigational Otolith Function." In Otolith Function and Disorders, 68–76. Basel: KARGER, 2000. http://dx.doi.org/10.1159/000059112.
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Van Nechel, Ch, M. Toupet, and I. Bodson. "The Subjective Visual Vertical." In Otolith Function and Disorders, 77–87. Basel: KARGER, 2000. http://dx.doi.org/10.1159/000059113.
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Wiener-Vacher, S. "Clinical Application of the Off Vertical Axis Rotation Test (OVAR)." In Otolith Function and Disorders, 88–97. Basel: KARGER, 2000. http://dx.doi.org/10.1159/000059114.
Full textConference papers on the topic "Otoliti"
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Schoenmaekers, Catho, Chloë De Laet, Ludmila Kornilova, Dmitrii Glukhikh, Steven Moore, Hamish MacDougall, Ivan Naumov, et al. "The effect of spaceflight on the otolith-mediated ocular counter-roll." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.122.
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The otoliths of the vestibular system are seen as the primary gravitational sensors and are responsible for a compensatory eye torsion called the ocular counter-roll (OCR). The OCR ensures gaze stabilization and is sensitive to a lateral head roll with respect to gravity and the Gravito-Inertial Acceleration (GIA) vector during e.g., centrifugation. This otolith-mediated reflex will make sure you will still be able to maintain gaze stabilization and postural stability when making sharp turns during locomotion. To measure the effect of prolonged spaceflight on the otoliths, we measured the OCR induced by off-axis centrifugation in a group of 27 cosmonauts before and after their 6-month space mission to the International Space Station (ISS). We observed a significant decrease in OCR early post-flight, with first- time flyers being more strongly affected compared to frequent or experienced flyers. Our results strongly suggest that experienced space crew have acquired the ability to adapt faster after G-transitions and should therefore be sent for more challenging space missions, e.g., Moon or Mars, because they are noticeably less affected by microgravity regarding their vestibular system.
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Grant, W. "Otolith biomechanics." In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1988. http://dx.doi.org/10.1109/iembs.1988.94645.
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Grant, J. Wallace, and William A. Best. "Otolith Biomechanics." In Intersociety Conference on Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1988. http://dx.doi.org/10.4271/881074.
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Jadeed, R., A. Aljaber, J. Ilgner, and M. Westhofen. "Otolith dysfunction in bilateral vestibulopathys." In Abstract- und Posterband – 90. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Digitalisierung in der HNO-Heilkunde. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1686410.
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Cao, F., and R. Fablet. "Automatic morphological detection of otolith nucleus." In Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004. IEEE, 2004. http://dx.doi.org/10.1109/icpr.2004.1334602.
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"OTOLITH IMAGE ANALYSIS BY COMPUTER VISION." In International Conference on Bio-inspired Systems and Signal Processing. SciTePress - Science and and Technology Publications, 2008. http://dx.doi.org/10.5220/0001067204900497.
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Soria, Jose Antonio, Kamal Nasreddine, Vicenc Parisi-Baradad, Lluis Ferrer-Arnau, and Abdesslam Benzinou. "Otolith shape classification for fish stock discrimination." In 2014 First International Image Processing, Applications and Systems Conference (IPAS). IEEE, 2014. http://dx.doi.org/10.1109/ipas.2014.7043302.
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Okeke, Marie-Urlima, Sonya T. Smith, and Werner Graf. "A Computational Model of Vestibular Fluid Response to Human Body Rotation." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-67035.
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A computational model was developed to study the response of vestibular fluid to body motions, relating eye movement to vestibular displacement. The response in the semicircular canals (SCCs) and otolith organs were approximated as a torsional pendulum and a forced wave equation, respectively. The results of the math model were found to be consistent with results found in previous models. The results of the model will also be compared to those found experimentally using VALUS, a rotational platform updated to be used for vestibular testing.
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Zelanko, Paula, and Dave Keller. "OTOLITH MICROCHEMISTRY AS A NOVEL INDICATOR OF FRACK WATER POLLUTION." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-285378.
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Fablet, R., N. Le Josse, and A. Benzinou. "Automatic fish age estimation from otolith images using statistical learning." In Proceedings of the 17th International Conference on Pattern Recognition, 2004. ICPR 2004. IEEE, 2004. http://dx.doi.org/10.1109/icpr.2004.1333821.
Full textReports on the topic "Otoliti"
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Grissett, James D. Mathematical Model for Interaction of Canals and Otoliths in Perception of Orientation, Translation, and Rotation. Fort Belvoir, VA: Defense Technical Information Center, December 1993. http://dx.doi.org/10.21236/ada280897.
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Myrenås, Elin. Utvärdering av ålyngelutsättningar – Svenska väst- och sydkustområden. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2022. http://dx.doi.org/10.54612/a.11hagsqss7.
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Sverige har sedan 2009 tillämpat en ålförvaltningsplan där en av förvaltningsåtgärderna är stödutsättningar av glasålar i svenska vatten. Dessa ålar importeras från länder där det anses finnas ett överskott av ankommande glasål. Sedan ålförvaltningens början har alla utsatta ålar märkts med strontium och vi kan därför idag skilja på naturligt rekryterade ålar och stödutsatta ålar genom en strontiumanalys av deras otoliter. På väst- och sydkusten finns det två provfiskeprogram där ål har samlats in och strontiumanalyserats. Dessa program inbegriper fiske med ryssja vid en lokal utanför Stenungsund och med elfiske vid 24 olika lokaler vid grunda kustområden eller i mindre vattendrag (fallfälla och nettingfälla i ett fåtal fall). Av de totalt 1118 ålar som analyserats var 9 % av utsatt härkomst och de påvisades endast vid fyra lokaler. Dessa ligger alla i närheten av Orust och Tjörn där det har pågått utsättningar sedan 2010. Ålar som sattes ut de första åren efter att utsättningarna påbörjades i detta område har fångats kontinuerligt i provfisket sedan dess vilket kan vara ett tecken på att utsatta ålar stannar kvar i området de sätts ut i. Senare utsättningar har däremot inte påträffats i samma utsträckning. Det finns tidigare studier som visar att en hög densitet av ål i ett område kan leda till högre mortalitet. Det finns däremot inget som tyder på någon skillnad i kondition eller tillväxt mellan naturligt rekryterade och utsatta ålar bland de som analyserats i denna studie. Det finns därför inte några tecken idag på varför ål som satts ut senare inte fångas i provfisket eller varför andelen utsatt ål är låg jämfört med naturliga rekryter trots stora utsättningar i detta område. På majoriteten av de fiskade lokalerna har inga märkta ålar påträffats trots att hundratusentals ålar har satts ut i vattendrag som mynnar ut på den svenska väst- och sydkusten. En anledning kan vara att många av dessa utsättningar har skett i sjöar en bit inåt land och att dessa ålar inte har haft någon anledning att byta uppväxtmiljö och ännu inte har blivit gamla nog att söka sig ut mot havet för att leka.
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Jacobson, Philip, Håkan Wickström, Susanne Tärnlund, Maja Reizenstein, and Josefin Sundin. Ålen i Fardume träsk – sammanställning över data från 1980-2022. Department of Aquatic Resources, Swedish University of Agricultural Sciences, 2023. http://dx.doi.org/10.54612/a.52399ldqvh.
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Denna rapport sammanställer information om projektet Ålen i Fardume träsk, som startade 1980 på Gotland med syftet att undersöka både ekologiska och ekonomiska resultat av ålutsättningar. Då projektet varit igång sedan 1980 har flera aktörer varit inblandade, och data har lagrats i pärmar och digitalt på olika hårddiskar, servrar och databaser genom åren. Syftet med denna rapport är därför att redogöra vad som gjorts inom projektet sedan 1980 fram till idag (2022), för att ge en bakgrund till det arbete som gjorts, vilka studier som publicerats med data från platsen och vilket data som idag finns tillgängligt. Denna syntes är nödvändig för att möjliggöra framtida användning av insamlad data från ålprojektet vid Fardume träsk. Totalt har ca 101 000 ålindivider satts ut i Fardume träsk, 1980 sattes det ut ca 53 000 individer och 1989 sattes det ut ytterligare ca 48 000 individer. Det introducerade ålbeståndets utveckling har sedan följts upp kontinuerligt via en fälla som fångar utvandrande ål från Fardume träsk i Bångån. Fällan har varit drift sedan 1980 och det samlas fortfarande in ål här vilket idag finansieras via SLU Aqua och länsstyrelsen Gotland. Fällan i Bångån har genererat utvandringsdata (antal fångade ålar per år) samt individdata då ål samlats in från fällan för individprovtagning i laboratorium. Totalt har det publicerats åtta vetenskapliga artiklar baserat på data från Fardume träsk, den första publicerades 1986 och den sista 2003. Sedan 2003 har inga vetenskapliga artiklar publicerats med data från Fardume träsk. Otoliter från ål från Fardume träsk har använts för att utveckla och validera åldersläsning av ål då de har en känd ålder (utsatta antingen 1980 eller 1989). Data från Fardume träsk gicks igenom av personal på SLU Aqua under 2020 och 2021 då det fanns flera frågetecken kring datakvalitén och var data lagrades. Sammanställningarna visade att fångstdata från fällan i Bångån behöver ses över och jämföras med fältprotokoll (främst efter 1995) men det går att använda data idag för att säga att det bör ha fångats minst 14 914 individer i fällan under 1980-2022. Individdata finns idag sparade i två separata Excel-filer samt i SLU Aquas databas Sötebasen, dessa filer behöver ses över, kombineras, kontrolleras så att inte samma individ förekommer flera gånger och sedan lagras på en beständig plats innan det kan användas i forskningssyfte. Det finns idag 26 år med data från Fardume träsk som inte använts i någon (för oss) känd vetenskaplig artikel eller rapport. Data från fällan i Bångån skulle kunna användas för att utvärdera hur stor andel av utsättningen som återfångats vilket kan användas för att skatta hur mycket ål som producerats på en känd sjöareal, möjliggöra nya studier gällande utvandringsstorlekar, kondition, tillväxt, parasitering med mera. Individdata skulle kunna användas för att följa tillväxtmönster, överlevnad, könsfördelning, konditionsfaktorer och storleksstrukturen för den ål som vandrat ut från Fardume träsk via Bångån samt för att utvärdera hur länge utsatt ål stannar i ett system efter en utsättning.