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Journal articles on the topic 'Crab shells'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Arce, Elsah, and Guillermina Alcaraz. "Plasticity of shell preference and its antipredatory advantages in the hermit crab Calcinus californiensis." Canadian Journal of Zoology 91, no. 5 (2013): 321–27. http://dx.doi.org/10.1139/cjz-2012-0310.

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The preference of the hermit crab Calcinus californiensis Bouvier, 1898 among six shell species and different shell sizes was evaluated in the presence of the swimming crab Arenaeus mexicanus (Gerstaecker, 1856), a natural predator of this species. In a second experiment, the survival benefit of the shell choice made under predation threat was examined by exposing hermit crabs occupying three different shell species (including the most and least preferred shells of two fits) to a free swimming crab predator. The preference for shell species was similar in the absence and presence of the predat

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2

Turra, Alexander, and Fosca P. P. Leite. "Shell utilization patterns of a tropical intertidal hermit crab assemblage." Journal of the Marine Biological Association of the United Kingdom 82, no. 1 (2002): 97–107. http://dx.doi.org/10.1017/s0025315402005210.

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The shell selection and utilization patterns of three sympatric hermit crab populations (Clibanarius antillensis, C. sclopetarius, and C. vittatus) and shell availability were studied in a tropical intertidal low energy area. Shell availability (except for C. antillensis) was low and the hermit crabs showed overlap in size (mainly C. sclopetarius and C. vittatus). The influence of shell availability and selection on shell use was dependent on crab species. Clibanarius antillensis used mainly shells of Cerithium atratum, the most available shell species, while Clibanarius sclopetarius and C. vi

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3

Rodrigues, GFB, CS Ballarin, A. Fransozo, and FW Amorim. "Structural patterns of a coastal hermit crab-gastropod shell interaction network: new insights from a unique relationship." Marine Ecology Progress Series 640 (April 23, 2020): 117–26. http://dx.doi.org/10.3354/meps13288.

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Hermit crabs are ideal organisms for assessing how species that share resources can coexist, as these crustacean species have an intimate relationship with gastropod shells and therefore compete for this particular resource. There is compelling evidence that hermit crabs do not interact with gastropod shells randomly, but few studies have investigated the community-level interactions between hermit crabs and shells. Here we used network analyses to present the first community-level assessment of the structure of a hermit crab-shell interaction network in a coastal region in southeastern Brazil

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LaBarbera, Michael, and Rachel Ann Merz. "Postmortem changes in strength of gastropod shells: evolutionary implications for hermit crabs, snails, and their mutual predators." Paleobiology 18, no. 4 (1992): 367–77. http://dx.doi.org/10.1017/s0094837300010940.

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Calliostoma ligatum shells inhabited by hermit crabs were weaker than shells inhabited by snails collected at the same locality. When shells of C. ligatum were loaded repetitively to 80% of their predicted failure load, hermit crab-inhabited shells showed an immediate drop in shell strength followed by a progressive further loss of shell strength over the next 18 days. Snailinhabited C. ligatum shells exhibited a decrease in strength after 9 days, but returned to initial values within 18 days of loading.Hermit crabs thus bear shells significantly weaker than they were when borne by the gastrop

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Annisa, R. Marwita Sari Putri, and Aidil Fadli Ilhamdy. "Characterization of Briquette from Crab Shell (Portunus pelagicus) with The Addition of Pati Adhesive." Marinade 2, no. 01 (2019): 59–65. http://dx.doi.org/10.31629/marinade.v2i01.1257.

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Briquettes is a solid fuel that can be used as an alternative energy source which has a certain shape. This study aims to determine the effect starch adhesive material on the characteristics of briquettes from crab shells waste. the percentage used between the crab shells and the adhesive were 85%: 15%, 80%: 20%, 75%: 25% and 70%: 30%, with the size of the powder sieve 40 mesh. Mixed crab shells powder and starch produces water content of 4.34-5.25%, where the value is in conformity with the desired moisture content SNI. The addition of adhesive on crab shell briquettes generates density value

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Hossain, Abul, and Fereidoon Shahidi. "Upcycling Shellfish Waste: Distribution of Amino Acids, Minerals, and Carotenoids in Body Parts of North Atlantic Crab and Shrimp." Foods 13, no. 17 (2024): 2700. http://dx.doi.org/10.3390/foods13172700.

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The snow/pink crab (Chionoecetes opilio) and Northern shrimp (Pandalus borealis) are widely distributed in the North Atlantic Ocean. During processing/consumption, about 80% of the harvest is discarded as processing waste, which is a rich source of protein, chitin, minerals, and carotenoids. This study, for the first time, investigated the proximate composition and individual amino acids, minerals, and carotenoids from different body parts (carapace, shoulder, claw, tip, and leg) of snow crabs and shrimp shells. Shrimp proteins were found to be abundant and well-balanced in their amino acid co

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7

Arce, E., and A. Córdoba-Aguilar. "The right choice: predation pressure drives shell selection decisions in the hermit crab Calcinus californiensis." Canadian Journal of Zoology 96, no. 5 (2018): 454–59. http://dx.doi.org/10.1139/cjz-2017-0023.

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Several prey species use refuges to avoid predation. Prey need to abandon and shift between refuges. However, during such shifting, prey can be vulnerable to predators. We hypothesize that predator presence may induce prey to make mistakes in choosing their refuge. We tested this by inducing the hermit crab Calcinus californiensis Bouvier, 1898 to shift to a new empty gastropod shell (three different species: Columbella Lamarck, 1799, Nerita scabricosta Lamarck, 1822, and Stramonita biserialis (Blainville, 1832)) in the absence and presence of Eriphia squamata Stimpson, 1860, which is an effic

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8

Floeter, S. R., R. C. Nalesso, M. M. P. Rodrigues, and A. Turra. "Patterns of shell utilization and selection in two sympatric hermit crabs (Anomura: Diogenidae) in south-eastern Brazil." Journal of the Marine Biological Association of the United Kingdom 80, no. 6 (2000): 1053–59. http://dx.doi.org/10.1017/s0025315400003118.

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The present study evaluated shell utilization and preference of two sympatric hermit crab species, Calcinus tibicen and Clibanarius antillensis, from Ilha Galheta de Dentro, Vitória Bay, south-eastern Brazil. Distribution of individuals and use and availability of shells were estimated in the field, where micro-habitat and shell partitioning were demonstrated between the two species of crabs. Calcinus occurred in higher numbers in the infralittoral fringe and shallow subtidal, while Clibanarius was found mainly in the midlittoral zone. The crabs used shells of different architectures and sizes

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9

Rittschof, D., C. M. Kratt, and A. S. Clare. "Gastropod predation sites: the role of predator and prey in chemical attraction of the hermit crab Clibanarius vittatus." Journal of the Marine Biological Association of the United Kingdom 70, no. 3 (1990): 583–96. http://dx.doi.org/10.1017/s0025315400036602.

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Gastropod shells are essential to most hermit crabs. Shell availability limits hermit crab populations. Shells provide protection and the degree of shell-fit controls crab growth and fecundity. Crabs locate new gastropod shells from a distance under water by molecules released from gastropod flesh during predation events. Here we test the hypothesis that the salivary glands of the predatory gastropod are the source of enzymes that digest muscle proteins and release peptide attractants. We describe the anatomy of both the acinous salivary glands and the tubular accessory salivary glands of Busy

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Chávez-Solís, Carlos Enrique, and Guillermina Alcaraz. "Hiding time of the hermit crab Calcinus californiensis: observations from different shell types." Canadian Journal of Zoology 93, no. 7 (2015): 559–65. http://dx.doi.org/10.1139/cjz-2014-0312.

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Hermit crabs respond to predators by hiding in their shells. However, retraction may cause the crab to lose hold of the rock and fall through the water column, and the crab may land with the shell aperture in a different orientation. When the shell is aperture down, hermit crabs return to activity by moving their bodies forward and placing their legs on the ground. In contrast, when the shell is aperture up, crabs need to perform a righting maneuver by extending part of their bodies out of the shell, which makes them more vulnerable to predation. The main goal of this study was to examine the

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Laidre, Mark E., and Rebecca Trinh. "Unlike terrestrial hermit crabs, marine hermit crabs do not prefer shells previously used by conspecifics." Crustaceana 87, no. 7 (2014): 856–65. http://dx.doi.org/10.1163/15685403-00003320.

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Gastropod shells represent an essential resource for hermit crabs (Decapoda, Anomura). In many cases, hermit crabs acquire used shells from conspecifics who previously occupied the shell. Terrestrial hermit crabs (Coenobita compressus H. Milne Edwards, 1836) strongly prefer used shells. Here we test whether marine hermit crabs (Pagurus samuelis (Stimpson, 1857)) also exhibit a preference for used shells by providing them with matched pairs of (1) a used shell (previously occupied by either the choosing crab itself or by a conspecific) versus (2) a brand new shell (freshly derived from a predat

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Sampaio, Sara R., and Setuko Masunari. "Characterization of the occupied shells by the hermit crab Clibanarius vittatus (Decapoda, Diogenidae) at Baixio Mirim tideflat, Guaratuba Bay, southern Brazil." Anais da Academia Brasileira de Ciências 82, no. 4 (2010): 833–42. http://dx.doi.org/10.1590/s0001-37652010000400005.

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A characterization of the occupied shells by the hermit crab Clibanarius vittatus was carried out. Hermit crabs were collected in the intertidal zone, during the low spring tide monthly from April 2005 to March 2006. They were sexed and their cephalothoracic shield length (CL) was measured. Shells were identified, dried, weighed and the aperture length (AL) and width (AW) were measured. 1187 crabs were collected (949 males, 216 females and 22 intersexes), which occupied 12 species of gastropod shells. Stramonita haemastoma, Olivancillaria urceus and Dorsanum moniliferum made up 96.55% of the t

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Billock, Wendy L., and Stephen G. Dunbar. "Influence of motivation on behaviour in the hermit crab, Pagurus samuelis." Journal of the Marine Biological Association of the United Kingdom 89, no. 4 (2008): 775–79. http://dx.doi.org/10.1017/s0025315408002543.

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Both the need for shelter and the need for food can be motivations that alter animal behaviour. We tested the hypothesis that the hermit crab, Pagurus samuelis, deprived of food, shells, or both will respond differently from control hermit crabs when presented with food and shells concurrently. We measured the number of contacts made with both food and shells, and time elapsed until hermit crabs either began feeding or inserted into shells. We interpreted making few contacts and initiating behaviour quickly to be an indication of short decision time and high motivation; whereas, making many co

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Sant'Anna, Bruno S., Cilene M. Zangrande, Alvaro L. D. Reigada, and Marcelo A. A. Pinheiro. "Shell utilization pattern of the hermit crab Clibanarius vittatus (Crustacea, Anomura) in an estuary at São Vicente, State of São Paulo, Brazil." Iheringia. Série Zoologia 96, no. 2 (2006): 261–66. http://dx.doi.org/10.1590/s0073-47212006000200018.

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We evaluated the gastropod shell utilization pattern of the hermit crab Clibanarius vittatus (Bosc, 1802) at Pescadores Beach in São Vicente, State of São Paulo, Brazil. Specimens were collected monthly from May 2001 through April 2003, in the intertidal zone at low tide. The crabs were weighed and their carapace shield length measured. All gastropod shells were identified and had their shell biometric parameters (total length and aperture length) measured (mm) and weighed (g). A total of 2,344 hermit crabs (644 males, 1,594 females, 45 ovigerous females and 61 individuals in intersex), using

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15

HERREID, CLYDE F., and ROBERT J. FULL. "Locomotion of Hermit Crabs (Coenobita Compressus) on Beach and Treadmill." Journal of Experimental Biology 120, no. 1 (1986): 283–96. http://dx.doi.org/10.1242/jeb.120.1.283.

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Coenobita compressus (H. Milne Edwards) walk forward on six legs using analternating tripod gait similar to that of insects. The first walking leg provides thedriving force for locomotion aided secondarily by the second walking leg, while thechelipeds act largely as supports. The left appendages are longer and heavier than theright, and they extend further laterally from the midline during their stride, thus compensating for the asymmetry of the crab which has a dextrally coiled shell and anabdomen displaced to the right. The abdomen is normally carried off the ground, but it is dragged when t

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Ayres-Peres, Luciane, Aline Ferreira Quadros, and Fernando L. Mantelatto. "Comparative analysis of shell occupation by two southern populations of the hermit crab Loxopagurus loxochelis (Decapoda, Diogenidae)." Brazilian Journal of Oceanography 60, no. 3 (2012): 299–310. http://dx.doi.org/10.1590/s1679-87592012000300003.

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The present study aimed to comparatively verify the relation between the hermit crabs and the shells they use in two populations of Loxopagurus loxochelis. Samples were collected monthly from July 2002 to June 2003, at Caraguatatuba and Ubatuba Bay, São Paulo, Brazil. The animals sampled had their sex identified, were weighed and measured; their shells were identified, measured and weighed, and their internal volume determined. To relate the hermit crab's characteristics and the shells' variables, principal component analysis (PCA) and a regression tree were used. According to the PCA analysis

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Nekvapil, Fran, Iolanda-Veronica Ganea, Alexandra Ciorîță, et al. "Wasted Biomaterials from Crustaceans as a Compliant Natural Product Regarding Microbiological, Antibacterial Properties and Heavy Metal Content for Reuse in Blue Bioeconomy: A Preliminary Study." Materials 14, no. 16 (2021): 4558. http://dx.doi.org/10.3390/ma14164558.

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The compliance of crab shells traditionally used as a complex natural product for agricultural soil amendment with modern biofertilizers’ quality and safety requirements was investigated. Shells waste from the Blue crab, Callinectes sapidus and the Green crab, Carcinus aestuarii were tested for macronutrients, heavy metals, bacteria content, and antimicrobial properties. Such information is crucial for further utilization of the biogenic powders for any composite formulation in added-value by-products. The calcium carbonate-rich hard tissue yield was 52.13% ± 0.015 (mean ± S.D.) and 64.71% ± 0

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Walker, Sally E. "Preservational constraints and ecological opportunities: the role of shell-inhabiting organisms in the fossil record." Paleontological Society Special Publications 6 (1992): 302. http://dx.doi.org/10.1017/s2475262200008625.

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Biological parameters, in addition to physical parameters, are important in determining past ecology, taphonomy and the effects of human intervention. Research conducted on a Recent community of gastropods and two late Pleistocene fossil assemblages from Puerto Penasco, Mexico, reveal a complex pattern of interrelationships among gastropod shell users. First, shell representation is biased in the intertidal of Puerto Penasco, Mexico, because of a complex mosaic of secondary shell occupants. Hermit crabs (five species) represent almost half (47%) of the intertidal gastropod shell resource avail

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Cicero, Diogo Lins de Oliveira, Maria Siqueira Quirino Ana, Andrade da Silva Erasmo, et al. "Shell choice and occupation by the hermit crab (Crustacea: Diogenidae) in laboratory environment." International Journal of Aquatic Biology 6, no. 2 (2018): 61–65. https://doi.org/10.5281/zenodo.3402532.

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The Neotropical hermit crabs’ behaviour is rarely studied, although it is an important tool for the conservation of these invertebrates. In this context, the present study aimed to describe the hermit crab ethogram on its behaviour in the choice and dispute by shells. 60 specimens of hermit crabs were collected that were occupying mollusc shells Cerithium atratum, in sandstone reefs. In the laboratory, 30 hermit crabs were removed from their host shells by heating, the rest remained in their shells. The specimens were submitted to five experimental tests: (I) behaviour, (II) shell disput

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Fachry, Mardiana E., and Alpiani Alpiani. "Literature review: Economic value of utilization of crab shell waste (Case study of PT. Toba Surimi Industri in Tanjungpinang City, Riau Island Province)." Akuatikisle: Jurnal Akuakultur, Pesisir dan Pulau-Pulau Kecil 5, no. 2 (2021): 49–52. http://dx.doi.org/10.29239/j.akuatikisle.5.2.49-52.

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Writing this scientific paper aims to determine the economic value of the potential waste of crab shells produced by PT. Toba Surimi Industry in Tanjungpinang City, Riau Islands Province. The company has not utilized crab shell waste. In contrast, crab shell waste can provide economic value that provides a lot of additional value. Crab shell waste can be processed into chitosan, which has many functions in various sectors, both in the fisheries, automotive and health industries, and other sectors. Chitosan is produced from the chitin substance contained in crab shells through deproteination, d

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Torjman, Brooke Z., and Erika V. Iyengar. "Hefting Heavy Shells: Sustenance Demands Caused by Various Abodes of the Hermit Crab Pagurus granosimanus." Hydrobiology 3, no. 2 (2024): 74–84. http://dx.doi.org/10.3390/hydrobiology3020006.

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Marine hermit crabs inhabiting different species of shells in the rocky intertidal may receive varied benefits and costs. Thick shell walls, sculpture, and certain silhouettes may increase protection against crushing predators and waves, but also the energy cost for bearing such a shell. To determine the relative energy demands on Pagurus granosimanus supporting one of three different species of shells commonly inhabited in nature, we measured the consumption of food by free-roaming, size-matched individuals after four days of food deprivation in the laboratory. Surprisingly, while all hermit

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Frameschi, I. F., L. S. Andrade, V. Fransozo, L. C. Fernandes-Góes, and A. L. Castilho. "Shell occupation by the hermit crab Dardanus insignis (Decapoda, Diogenidae) from the north Coast of São Paulo state, Brazil." Brazilian Journal of Biology 75, no. 4 suppl 1 (2015): 35–44. http://dx.doi.org/10.1590/1519-6984.00614.

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Abstract The pattern of shell occupation by the hermit crab Dardanus insignis (Saussure, 1858) from the subtropical region of southeastern coast of Brazil was investigated in the present study. The percentage of shell types that were occupied and the morphometric relationships between hermit crabs and occupied shells were analyzed from monthly collections conducted during two years (from January 1998 to December 1999). Individuals were categorized according to sex and gonadal maturation, weighed and measured with respect to their cephalothoracic shield length (CSL) and wet weight (CWW). Shells

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Trivedi, J. N., S. Arya, and K. D. Vachhrajan. "GASTROPOD SHELL UTILIZATION PREFERENCES OF HERMIT CRAB Clibanarius zebra (DANA, 1852) (DIOGENIDAE: ANOMURA)." TAPROBANICA 5, no. 1 (2013): 12–18. http://dx.doi.org/10.47605/tapro.v5i1.85.

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The aim of the present study was to characterize the patterns of gastropod shell utilization by the hermit crab Clibanarius zebra from four different sites along the Saurashtra coast, Gujarat state, India. A total of 404 individuals of hermit crab were captured (223 males, 147 females and 34 ovigerous females), occupying 22 species of gastropod shells. Maximum species diversity of shells occupied by the crab was observed at Veraval. Amongst all the shell species identified, Cerithium scabridum (36.88 %) was highly occupied by the crab species followed by Astra stellata (11.39 %), Turbo interco

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Cerrano, Carlo, Giorgio Bavestrello, Stefania Puce, and Michele Sarà. "Biological Cycle of Podocoryna Exigua (Cnidaria: Hydrozoa) from a Sandy Bottom of the Ligurian Sea." Journal of the Marine Biological Association of the United Kingdom 78, no. 4 (1998): 1101–11. http://dx.doi.org/10.1017/s0025315400044350.

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The genus Podocoryna is characterized by species living on shells usually inhabited by hermit crabs; but the mutual benefits of this association are not well understood.This study, besides describing the biological cycle of the hydroid Podocoryna exigua, brings new information on the relationship between hydroid and the hermit crab Diogenes pugilator, especially concerning their trophic strategies.The hydroid shows a seasonal cycle with a minimum density during summer and an increase during autumn and winter, reaching the highest value in spring. The production of medusae is almost constant du

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Ratri, Alliffia Balqis Candharaning. "PEMANFAATAN LIMBAH CANGKANG KEPITING SEBAGAI BAHAN PENAMBAHAN PAKAN TERNAK BERKALSIUM TINGGI DALAM TINJAUAN MODERASI BERAGAMA." Transformatif : Jurnal Pengabdian Masyarakat 2, no. 1 (2021): 101–24. http://dx.doi.org/10.22515/tranformatif.v2i1.3145.

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Crab creation is often found in Pantai Beringin Village, Sulamu District, Kupang Regency, East Nusa Tenggara. In one day, Pantai Beringin Village is able to collect 200 kilograms of crabs, on the other hand, 150 kilograms or 75% of the total are shells. Crab shells that are not used become waste that has been piled up for years and even thrown away. Meanwhile this village has a crab shell grinding machine, but it is not operational. Meanwhile, crab shells have as much as 70% chitin, so they are very good to use as a basic ingredient for making animal feed. Chitin, like an addictive feed, can a

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Nirmal, T., P. M. Nuzaiba, Alexandre R. Da Silva, et al. "Plasticity in shell selection behaviour by the endemic hermit crab Diogenes alias (Anomura, Diogenidae) from the northeastern Arabian Sea, India." Crustaceana 93, no. 9-10 (2020): 1135–52. http://dx.doi.org/10.1163/15685403-bja10038.

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Abstract Selection of gastropod shells as shelter by hermit crabs in controlled experiments would provide useful information on the utility of these shells in nature. In this study, shell size and species preferences of Diogenes alias from the northeastern Arabian Sea were quantified by free choice experiments. Males of D. alias, prefer Indothais lacera and Tibia curta, when choice was given; no differences were found for other demographic groups. All hermit crabs occupied larger shells than the shells they occupied in nature. The best correlation was observed between internal volume, weight,

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Suárez-Rodríguez, Monserrat, Karla Kruesi, and Guillermina Alcaraz. "The shadow of the shell: a cue for a new home." Journal of the Marine Biological Association of the United Kingdom 99, no. 5 (2019): 1165–69. http://dx.doi.org/10.1017/s0025315419000122.

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AbstractHermit crabs use different senses to search for and find shells. In most cases, chemical cues have been proven to act as a very efficient way of finding new shells. However, in intertidal environments, the water transports chemical signals in different directions and velocities may make it harder to track the source of the cue, so visual stimuli may be a more precise source of information. The hermit crab Calcinus californiensis shows a preference for the biconical shells of Stramonita biserialis, although the crabs may also use the less preferred shell of Nerita scabricosta. We were i

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Pratama, G., A. Munandar, D. Surilayani, et al. "Characteristics of crab shells and green mussel shells as potential chitosan material from Karangantu, Banten, Indonesia." IOP Conference Series: Earth and Environmental Science 1137, no. 1 (2023): 012033. http://dx.doi.org/10.1088/1755-1315/1137/1/012033.

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Abstract Shells are a waste of crab (Portunus pelagicus) and green mussels (Perna viridis) waste in Karangantu. That is a problem for the environment with a large number. One solution is to use it as a raw material for chitosan. This study aims to see the potential of crab shells and green mussel shells as well as raw materials for chitosan biomaterials. This research used shell waste of P. pelagicus and P. viridis (3 replications). The stages of the method of this research include the preparation of raw materials, manufacture of chitosan, and analysis product. Parameters measured in this stud

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Niswar, Muhammad, Zahir Zainuddin, Yushinta Fujaya, and Zagita Marna Putra. "An Automated Feeding System for Soft Shell Crab." Indonesian Journal of Electrical Engineering and Computer Science 5, no. 3 (2017): 564. http://dx.doi.org/10.11591/ijeecs.v5.i3.pp564-568.

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<p>Soft shell crab farming has been practiced in south-east Asian countries such as Indonesia. Soft shell crabs are harvested when they have just molted to prevent their shells from being hardened. An issue arises when feeding the crabs. Farmers need to feed the crabs 5% food of their body weight. However, farmers sometimes provide incorrect amounts of food to the crabs. If farmers feed the crab exceeding the required amounts of food, it causes food wastage and dirty water in the crabs’ cage. On the other hand, less amounts of food causes slow growth and molting of the crabs. In this stu

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Paraktuk, Azer Kalak, Tamrin Mallawangeng, and Eka Yuniarto. "Analisis Kuat Tekan Dan Kuat Tarik Belah Beton Dengan Menggunakan Cangkang Kepiting Dan Cangkang Kerang Sebagai Pengganti Parsial Semen." Jurnal Penelitian Teknik Sipil Konsolidasi 3, no. 1 (2025): 11–19. https://doi.org/10.56326/jptsk.v3i1.4381.

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The use of concrete materials in the world of construction has become the main choice because of its strength and durability. However, the use of concrete also has negative impacts on the environment, such as carbon dioxide emissions and the use of large amounts of energy. Therefore, using organic waste such as crab shells and oyster shells can help reduce waste and promote recycling practices. In this research, a normal concrete compressive strength design of 25 MPa was used with the aim of research to obtain the effect of using crab shells and clam shells as a partial replacement for cement.

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Komilus, Connie Fay, Nurul Ashikin Mohamad-Zuki, Nur Hamna Aminudin, Aidil Ikhwan Redhwan, and Nurul Aina Nadhirah Mohd-Khairulnizam. "Effects of Crab Shell Waste as Feed on Growth Performance and Colouration of Siamese Fighting Fish (Betta splendens)." Malaysian Applied Biology 52, no. 5 (2023): 213–20. http://dx.doi.org/10.55230/mabjournal.v52i5.fisas10.

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Betta splendens, Siamese fighting fish exhibit behavior, coloration, and morphology that make them popular aquarium fish in aquaculture. Coloration for this fish requires high-quality feeds rich in carotenoids. Crab shells, mostly dumped as agro-waste by the seafood industry contain carotenoids and protein that can be an alternative for carotenoids in fish feed. The objectives of this study were to analyze the proximate composition and carotenoid content in feed and determine the effect of crab shells as feedstuff on the growth performance and coloration of Betta splendens. A 40-day feeding tr

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MIFTAHUR ROHMI, RIA ASHARI, and HANDRI JURYA PARMI. "ANALISIS TINGKAT MINAT MASYARAKAT TERHADAP PEMANFAATAN CANGKANG RAJUNGAN DAN RUMPUT LAUT SEBAGAI OLAHAN KERUPUK." Jurnal Ilmiah Bahari 3, no. 02 (2022): 21–29. http://dx.doi.org/10.46601/jib.v3i02.216.

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ABSTRAK Masyarakat kurang memperhatikan tingkat minat masyarakat terhadap produk olahan kerupuk yang berbahan dasar cangkang rajungan dan rumput laut. Cangkang Rajungan mengandung industri pasteurisasi atau pengalengan rajungan, cangkang rajungan memiliki 19,97% kalsium dan 1,81% fosfor. Metode penelitian ini menggunakan metode eksperimen dan data dianalisis dengan Analisa Variansi (ANOVA) dengan taraf 5%. Hasil uji organoleptik menunjukkan bahwa penilaian panelis terhadap produk kerupuk rumput laut cangkang rajungan memberikan pengaruh berbeda nyata pada rasa, kerenyahan, dan arom

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Bick, Andreas. "Polychaete communities associated with gastropod shells inhabited by the hermit crabs Clibanarius erythropus and Calcinus tubularis from Ibiza, Mediterranean Sea." Journal of the Marine Biological Association of the United Kingdom 86, no. 1 (2006): 83–92. http://dx.doi.org/10.1017/s0025315406012884.

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Shells inhabited by hermit crabs are unique microhabitats with an abundant epi- and endofauna. Using polychaetes as an example, communities associated with the whelk Stramonita haemastoma, the hermit crabs Clibanarius erythropus and Calcinus tubularis, as well as empty, damaged shells were investigated. No polychaete community was associated with live S. haemastoma: only 30% of the investigated gastropods harboured polychaetes. Hermit crab-occupied shells supported polychaete communities dominated by Spirorbidae in the case of Clibanarius erythropus and by small Sabellidae, Spirobranchus polyt

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Wiratnaya, I. Gede Eka, Ida Bagus Deny Prayudi, and Hans Kristian Nugraha. "Differences in Calcium Carbonate, Collagen and BMP-2 between Lutjanus campechanus Extract and Brachyura Sp. Extract." International Journal of Health Sciences and Research 13, no. 1 (2023): 107–10. http://dx.doi.org/10.52403/ijhsr.20230115.

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Calcium is a mineral the body needs to maintain bone density and prevent musculoskeletal diseases. One of the basic ingredients that are easy to find are snapper bones and crab shells. Lutjanus campechanus species will be used for snapper bones and Brachyura species crab shells will be made into a powder extract, then an assessment will be carried out on each sample to measure calcium carbonate levels using EDTA, collagen levels using PicrosiriusRed, and BMP-2 levels. by using MyBioSource. Furthermore, snapper bone and crab shell extracts which have higher levels of calcium carbonate, collagen

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Tran, My Ngoc Diem, and Lan Thi Thanh Le. "The food composition in the Scylla paramamosain's stomach growing in the mangrove forest and industrial farming at Can Gio district, Ho Chi Minh City." Science and Technology Development Journal - Natural Sciences 2, no. 5 (2019): 35–39. http://dx.doi.org/10.32508/stdjns.v2i5.775.

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Mud crab (Scylla paramamosain) farming is widely developed in Can Gio, however the economic value is not so high because buyers always prefer the crabs which are caught in the mangrove. The hypothesis is that whether there are differences in the food composition between two crab types (farming and mangrove) or not. So, the research was conducted at Can Gio mangrove forest to analyze the stomach content of S. paramamosain. The results were the food ingredients in S. paramamosain in Can Gio including snail shells, crab shells, animal materials, leaves, sand and unidentified materials. The snail

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Walker, S. E. "Criteria for recognizing marine hermit crabs in the fossil record using gastropod shells." Journal of Paleontology 66, no. 4 (1992): 535–58. http://dx.doi.org/10.1017/s0022336000024410.

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Hermit crabs have left a rich fossil legacy of epi- and endobionts that bored or encrusted hermit crab-inhabited shells in specific ways. Much of this rich taphonomic record, dating from the middle Jurassic, has been overlooked. Biological criteria to recognize hermitted shells in the fossil record fall within two major categories: 1) massive encrustations, such as encrusting bryozoans; and 2) subtle, thin encrustations, borings, or etchings that surround or penetrate the aperture of the shell. Massive encrustations are localized in occurrence, whereas subtle trace fossils and body fossils are

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Fantucci, MZ, R. Biagi, and FL Mantelatto. "Shell occupation by the endemic western Atlantic hermit crab Isocheles sawayai (Diogenidae) from Caraguatatuba, Brazil." Brazilian Journal of Biology 68, no. 4 (2008): 859–67. http://dx.doi.org/10.1590/s1519-69842008000400023.

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The aim of this study was to characterize the pattern of shell occupation by the hermit crab Isocheles sawayai Forest and Saint-Laurent, 1968, from the Caraguatatuba region. The percentage of shell types that were occupied and the morphometric relationships between hermit crabs and occupied shells were analyzed from systematized collections that were conducted monthly from July 2001 to June 2003. A total of 373 individuals were captured (297 males, 41 non-ovigerous females, 25 ovigerous females and 10 intersexes), occupying 17 species of gastropod shells. Stramonita haemastoma (Linnaeus, 1767)

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Moraes, Sávio Arcanjo Santos Nascimento, Valéria Fonsêca Vale, Carlos Eduardo Rocha Duarte Alencar, and Fúlvio Aurélio Morais Freire. "PAGURIZED GASTROPOD SHELLS IN A NORTHEAST BRAZILIAN COASTAL LAGOON AT THE SEA-ESTUARY INTERFACE." Oecologia Australis 26, no. 03 (2022): 445–60. http://dx.doi.org/10.4257/oeco.2022.2603.04.

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Gastropods are known for the presence of calcareous shells, even after their death. The diversity of this resource can be reflected in the local diversity of living gastropods. These shells are used by hermit crabs as protection and against desiccation. Coastal lagoons are biodiversity hotspots and the site of recruitment of continent-sea connectivity, and their diversity is sometimes altered by connectivity events with adjacent areas. Therefore, we sought to make a list that evaluates the seasonal variation of diversity and demonstrates the pattern of shell use by hermit crab species. The sam

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Ando, Takamichi, and Michio Imafuku. "BEHAVIOUR AND MORPHOLOGY OF PAGURID HERMIT CRABS (DECAPODA, ANOMURA) THAT LIVE IN TUSK SHELLS (MOLLUSCA, SCAPHOPODA)." Crustaceana 72, no. 2 (1999): 129–44. http://dx.doi.org/10.1163/156854099503221.

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AbstractBehaviour and morphology of the hermit crab, Pagurus imafukui, which occupies tusk shells in nature, were investigated. A positive correlation was found between the shield length of the crab and the width of the tusk shell. The uropods were nearly symmetrical, with an average asymmetry index of 0.04, such in contrast with a value of 0.28 for Pagurus filholi, that naturally occupies dextral shells. P. imafukui showed a weak preference for tusk shells over dextral shells. The crabs walked in a parallel pattern, while they adopted a cross pattern when forced to enter dextral shells or wer

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Rahman, Laode Abdul, Syahrul Syariman, and Arman Setiawan. "Analisis Penggunaan Cangkang Kepiting Bakau Scylla Serrata Sebagai Subtitusi Parsial Semen Terhadap Kuat Tekan Dan Kuat Lentur Beton Dengan Bahan Tambah Superplasticizer." Jurnal Penelitian Teknik Sipil Konsolidasi 3, no. 1 (2025): 50–57. https://doi.org/10.56326/jptsk.v3i1.4371.

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Agricultural waste such as crab shells has the potential to pollute the surrounding environment. Crab shells contain calcium carbonate (CaCO3) which will react with calcium hydroxide in cement, forming a solid compound called calcium silicate hydrate (CSH). This research examines the use of mud crab (Scylla Serrata) shell waste as a partial substitute for cement in making concrete, with the addition of a superplasticizer. The percentage of crab shells used is 0%, 10%, and 20%, as well as 2% superplasticizer. The research results showed a decrease in the compressive strength of concrete with cr

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Alcaraz, Guillermina, and Karla Kruesi. "Niche overlap and resource partitioning between two intertidal hermit crab species." Journal of the Marine Biological Association of the United Kingdom 99, no. 1 (2017): 135–42. http://dx.doi.org/10.1017/s0025315417001850.

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The gastropod shell influences important aspects of the hermit crab's life; however, the shells are commonly a limited resource. Therefore, different hermit crab species that coexist in intertidal areas are commonly involved in intraspecific and interspecific competition for shells. We assess if differences in shell preference, exploitation ability, or competition by interference can explain the partitioning of shells between the coexisting species Calcinus californiensis and Clibanarius albidigitus. Clibanarius preferred shells of Nerita funiculata among the six gastropod shells tested, while

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Kumalasari, Ratih, Eko Hanuddin, and Makruf Nurudin. "Increasing Growth and Yield of Shallot Using Nano Zeolite and Nano Crab Shell Encapsulated NK Fertilizer in Entisols and Inceptisols." PLANTA TROPIKA: Jurnal Agrosains (Journal of Agro Science) 10, no. 2 (2022): 140–51. http://dx.doi.org/10.18196/pt.v10i2.12945.

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Nanotechnology can be used to produce slow-release fertilizers. Zeolite and crab shells are materials that can be used as fertilizer encapsulation. This study aimed to compare the effects of nano zeolite and crab shells for encapsulation of nitrogen- potassium fertilizers tested on Entisols and Inceptisols soil on the growth and yield of shallots. The research method used a completely randomized design with three factors. The factors were soil type (Entisol and Inceptisol), coating materials (nano-zeolite and nano-crab shell), and NK fertilizer doses (125:50, 250:100, 375:150, and 500:200). Th

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Biagi, Renata, Andrea L. Meireles, and Fernando L. Mantelatto. "Bio-ecological aspects of the hermit crab Paguristes calliopsis (Crustacea, Diogenidae) from Anchieta Island, Brazil." Anais da Academia Brasileira de Ciências 78, no. 3 (2006): 451–62. http://dx.doi.org/10.1590/s0001-37652006000300006.

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In southern Atlantic studies on hermit crab biology are scanty considering the local biodiversity. In this way, some population features of Paguristes calliopsis Forest and Saint Laurent, 1968 such as size frequency distribution, sex ratio and shell occupation in the natural environment were studied. Specimens were collected by means of scuba methods in the infralittoral area of the Anchieta Island. A total of 116 individuals were analyzed. Size measurements (minimum; maximum; mean shield length ± sd, respectively) were 0.8; 4.5; 2.76 ± 0.79 mm for males and 2.28 ± 0.36 mm for females. The sex

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Osemba, Martin Ouma, Mary Muriuki-Hutchins, Samuel Karenga, and Godfrey Keru. "Production of Chitosan from Crab Shells." International Journal of Advanced Research 7, no. 1 (2024): 244–50. http://dx.doi.org/10.37284/ijar.7.1.2193.

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The amino polysaccharide of chitin polymer happens to be the most commonly known polymer. Chitosan as a derivative of chitin is obtained through demineralization and deacetylation. Owing to the special properties of chitin and chitosan for instance their bio-compatibility, bio-biodegradability, non-toxicity and also capability to form films, have resulted in their suitability in chemical and thermal conductivity applications. In the field of nanotechnology, chitosan-based materials are currently being widely applied. The purpose of this review is to synthesize and characterize chitosan obtaine

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Bayuseno, A. P., A. I. Prasetya, R. Ismail, B. Setiyana, and J. Jamari. "REUSE OF WASTE CRAB SHELLS FOR SYNTHESIS OF CALCIUM CARBONATE AS A CANDIDATE BIOMATERIAL." Rasayan Journal of Chemistry 15, no. 01 (2022): 523–28. http://dx.doi.org/10.31788/rjc.2022.1516640.

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The crab shell (Portunus Pelagicus) wastes are constituted of major calcium carbonate (account for 70 wt. %) and have the potential to reuse as a starting biomaterial for precipitated calcium carbonate (PCC) products. The purpose of the present work was to synthesize PCC powder using crab shells based on the gas-solid-liquid carbonation route. In this experiment, crab shell powder was prepared by washing, drying, and subsequent grinding. The resulting powder was then calcined at 900 ℃ for 5 h before being used for the synthesis of the PCC product. Later, the calcined crab shell powder was diss

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Sari, Intan Permata, Esti Mulatsari, Esti Mumpuni, and Agus Purwanggana. "The Demineralization Optimization for Chitosan Synthesis from Crab Shell Waste (Portunus pelagicus)." JOPS (Journal Of Pharmacy and Science) 7, no. 2 (2024): 73–77. http://dx.doi.org/10.36341/jops.v7i2.4653.

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Chitosan, gelatin, albumin, and sodium alginate are examples of natural polymers that are often utilized as a basis material for polymeric nanoparticles. The deacetylation of chitin molecules produces the formation of chitosan. Chitin, protein, CaCO3, MgCO3, and astaxanthin pigment are all found in crab shells. Crab shell is an undervalued potential waste. Despite the fact that copious crab shell waste can be used to produce raw materials and industrial products. According to the findings of Mohadi et al (2014), chitosan was extracted with a yield of 70.71% and a deacetylation degree of 76.6%.

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Rezkiawan, Runal, Muhammad Niswar, and Amil Ahmad Ilham. "DETEKSI KEPITING MOLTING MENGGUNAKAN TEKNIK KLASIFIKASI MACHINE LEARNING." J-ENSITEC 8, no. 01 (2022): 599–610. http://dx.doi.org/10.31949/jensitec.v8i01.1909.

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Soft crab is an export product where foreign demand is much higher than production. In the production of soft crabs, it is done by keeping the crabs individually in a crab box which is placed in the pond until they molt. Molting is a natural process of molting, i.e. removing the old tough skin for growth purposes. Shortly after molting, the new crab shells are still very soft and will harden again after water absorption occurs. Therefore it is important to monitor molting crabs to help farmers in the cultivation of soft shell crabs. The number of crab datasets is 1060 which consists of 1000 tr

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Syamsiah, Syamsiah, Ratno Achyani, and Heni Irawati. "STUDI PEMANFAATAN CANGKANG KEPITING (Scylla sp.) UNTUK FILTER AIR TANAH DI KOTA TARAKAN." Jurnal Borneo Saintek 6, no. 1 (2023): 14–23. http://dx.doi.org/10.35334/borneo_saintek.v6i1.4199.

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The city of Tarakan has the potential of ground water for clean water needs. But for its use, it nedds to be treated first so that the quality is in accordance with the required quality standards. Crab shell (Scylla sp.) waste is used as a filtration technology for water treatment. The purpose of this research was to study the effetiveness of using crab shells as a ground water filter in Tarakan City. The research method used in this study was an experimental method with a complete random design (RAL). Repetition was done three times. The material used was crab shell with a filter level of 30,

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Krieger, Jakob, Marie K. Hörnig, and Mark E. Laidre. "Shells as ‘extended architecture’: to escape isolation, social hermit crabs choose shells with the right external architecture." Animal Cognition 23, no. 6 (2020): 1177–87. http://dx.doi.org/10.1007/s10071-020-01419-7.

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AbstractAnimals’ cognitive abilities can be tested by allowing them to choose between alternatives, with only one alternative offering the correct solution to a novel problem. Hermit crabs are evolutionarily specialized to navigate while carrying a shell, with alternative shells representing different forms of ‘extended architecture’, which effectively change the extent of physical space an individual occupies in the world. It is unknown whether individuals can choose such architecture to solve novel navigational problems. Here, we designed an experiment in which social hermit crabs (Coenobita

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Zhang, Luting, Peiyuan Sun, Xiaochi An, Xingxing Wang, Siying Li, and Bin Lian. "Vaterite Synthesized by Waste Liquid of Extracting Chitin from Crab Shells and the Mineral Loading for Doxorubicin Hydrochloride." Minerals 12, no. 12 (2022): 1608. http://dx.doi.org/10.3390/min12121608.

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To effectively treat the environmental pollution caused by discarded crab shell, chitin was extracted from discarded crab shells by a combined chemical and biological process. The chitin extraction waste liquid was used to culture bacteria to synthesize biogenic vaterite (BV). The mineral morphology and physico-chemical properties of BV were characterized, and the loading characteristics and adsorption mechanism of doxorubicin hydrochloride (DOX) were investigated. The results showed that chitin could be extracted from crab shells using a combination of chemical and biological methods, and the

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