Academic literature on the topic 'Esox – Reproduction'
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Journal articles on the topic "Esox – Reproduction"
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Kristan, Jiri, Azin Mohagheghi Samarin, Oleksander Malinovskyi, and Tomáš Policar. "Gamete management for artificial reproduction of northern pike Esox lucius (Linnaeus, 1758)." Aquaculture 528 (November 2020): 735575. http://dx.doi.org/10.1016/j.aquaculture.2020.735575.
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Bry, C., J. F. Batisse, and G. Neveu. "Survival of pike (Esox lucius L.) broodstock in relation to type of reproduction." Aquaculture 83, no. 3-4 (December 1989): 387–95. http://dx.doi.org/10.1016/0044-8486(89)90049-5.
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Weber, Michael J., and Michael L. Brown. "Application of a robust design occupancy model for assessing fish recruitment." Canadian Journal of Fisheries and Aquatic Sciences 76, no. 4 (April 2019): 561–68. http://dx.doi.org/10.1139/cjfas-2018-0083.
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Fish recruitment is complex, regulated by environmental factors that induce high mortality early in life. Additionally, age-0 fish can be difficult to sample, making recruitment difficult to detect. We used a robust design occupancy model to evaluate the effects of biotic (age-0 and adult common carp (Cyprinus carpio), bluegill (Lepomis macrochirus), walleye (Sander vitreus), and northern pike (Esox lucius) relative abundance, prey availability, age-0 carp length) and abiotic (water level, temperature) factors on age-0 carp occupancy, detection, and extinction in 13 lakes in South Dakota, USA, for July–April 2008–2010. Age-0 carp occupancy decreased with increasing adult carp abundance and increased with increasing water levels. Age-0 carp detection probability was high during summer (>0.75) but decreased in fall and spring (0.34). Most lakes were occupied in July but overwinter extinction probability was high (59%), resulting in 51% occupancy probability by April. Other environmental factors were not supported, suggesting they had little effect on reproduction and survival. Our results indicate reproduction was universally successful but difficult to detect and that overwinter mortality often resulted in recruitment failure.
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Hontela, Alice, Joseph B. Rasmussen, and Gaston Chevalier. "Endocrine Responses as Indicators of Sublethal Toxic Stress in Fish from Polluted Environments." Water Quality Research Journal 28, no. 4 (November 1, 1993): 767–80. http://dx.doi.org/10.2166/wqrj.1993.042.
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Abstract Development of new methods for detection of sublethal toxic effects of pollutants in aquatic organisms has become a focus of interest in ecotoxicology. The endocrine response to pollutants is an integral part of the homeostatic physiological processes activated in response to environmental stressors including pollutants. Changes in concentrations of hormones, particularly those regulating vital functions such as osmoregulation, energy metabolism, reproduction, or growth, may have potential as early warning indicators of toxic stress in fish. We review the recent literature in fish endocrine toxicology and illustrate the use of hormonal indicators in detection of acid stress in the brook trout. Salvelinus fontinalis, from lakes in the Canadian Shield, and of general toxic stress in the pike, Esox lucius, and the perch, Perca flavescens, from the St. Lawrence River system polluted by a mixture of chemicals.
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Möller, Sören, Helmut M. Winkler, Andreas Klügel, and Stefan Richter. "Using otolith microchemical analysis to investigate the importance of brackish bays for pike ( Esox lucius Linnaeus, 1758) reproduction in the southern Baltic Sea." Ecology of Freshwater Fish 28, no. 4 (March 20, 2019): 602–10. http://dx.doi.org/10.1111/eff.12478.
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Plourde-Lavoie, Patrick, Marc Archer, Karine Gagnon, and Pascal Sirois. "Les variations de niveau du lac Saint-Jean : effets sur la reproduction des poissons dans les habitats en milieux humides riverains." Le Naturaliste canadien 142, no. 1 (November 22, 2017): 66–77. http://dx.doi.org/10.7202/1042015ar.
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Le lac Saint-Jean a vu son régime hydrologique considérablement modifié depuis sa transformation en réservoir en 1926. Cet article examine les effets de la gestion du niveau du lac pour la fraie de la perchaude (Perca flavescens) et du grand brochet (Esox lucius). Une analyse des niveaux des eaux des 100 dernières années a permis de mettre en évidence une réduction des écarts entre les niveaux printaniers et estivaux, qui contribue vraisemblablement à diminuer la taille et la qualité des sites de reproduction, et un retardement de l’atteinte du niveau maximal au printemps par rapport au régime naturel. L’utilisation de données historiques de températures du lac et des milieux humides riverains a permis d’estimer les périodes de fraie de 1991 à 2015 et de mettre en évidence les conséquences des bas niveaux au printemps sur l’accessibilité des milieux humides. À présent, ces habitats ne sont généralement que partiellement inondés lors de la fraie des 2 espèces. Nous recommandons d’adopter une gestion du lac Saint-Jean qui vise à devancer l’atteinte des hauts niveaux printaniers et à maximiser les écarts entre les niveaux printaniers et estivaux, tout en maintenant un niveau stable au printemps pour permettre l’éclosion des oeufs de poissons et assurer la survie des jeunes stades de vie.
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Edeline, Eric, Thrond O. Haugen, Finn-Arne Weltzien, David Claessen, Ian J. Winfield, Nils Chr Stenseth, and L. Asbjørn Vøllestad. "Body downsizing caused by non-consumptive social stress severely depresses population growth rate." Proceedings of the Royal Society B: Biological Sciences 277, no. 1683 (November 18, 2009): 843–51. http://dx.doi.org/10.1098/rspb.2009.1724.
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Chronic social stress diverts energy away from growth, reproduction and immunity, and is thus a potential driver of population dynamics. However, the effects of social stress on demographic density dependence remain largely overlooked in ecological theory. Here we combine behavioural experiments, physiology and population modelling to show in a top predator (pike Esox lucius ) that social stress alone may be a primary driver of demographic density dependence. Doubling pike density in experimental ponds under controlled prey availability did not significantly change prey intake by pike (i.e. did not significantly change interference or exploitative competition), but induced a neuroendocrine stress response reflecting a size-dependent dominance hierarchy, depressed pike energetic status and lowered pike body growth rate by 23 per cent. Assuming fixed size-dependent survival and fecundity functions parameterized for the Windermere (UK) pike population, stress-induced smaller body size shifts age-specific survival rates and lowers age-specific fecundity, which in Leslie matrices projects into reduced population rate of increase ( λ ) by 37–56%. Our models also predict that social stress flattens elasticity profiles of λ to age-specific survival and fecundity, thus making population persistence more dependent on old individuals. Our results suggest that accounting for non-consumptive social stress from competitors and predators is necessary to accurately understand, predict and manage food-web dynamics.
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Jurajda, Pavel, Michal Janáč, Kevin Roche, Libor Mikl, Luděk Šlapanský, Ivo Krechler, Zdeněk Adámek, Zdenka Jurajdová, and Karel Halačka. "Fish Communities of Five Drinking Water Reservoirs in the Morava River Basin." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 66, no. 3 (2018): 655–63. http://dx.doi.org/10.11118/actaun201866030655.
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While fish communities have been studied in Czech reservoirs for decades, monitoring has increased since implementation of the EU Water Framework Directive (2000/60/EC). Despite this, many smaller drinking water reservoirs have yet to be surveyed. Between May and July 2016, we undertook a pilot‑study examining the fish communities of five Moravian reservoirs (Ludkovice, Bojkovice, Hubenov, Nová Říše and Landštejn). Fish were sampled using boat electrofishing along the littoral zone and Nordic gill nets in the pelagic zone. Both methods were evaluated separately and combined as CPUE and relative abundance and biomass ( %). Nineteen fish species and one hybrid were recorded, with roach Rutilus rutilus dominating overall by abundance, but carp Cyprinus carpio, pike Esox lucius and wels Silurus glanis dominating by biomass in electrofishing samples. Predatory species represented up to 60 % of biomass in the combined sample, with an F/C index ranging from 0.5–3, implying a high abundance of predators. Electrofishing tended to underestimate the abundance of bleak and ruffe, while gill nets underestimated the biomass of predatory species. In some reservoirs, the abundance of pike and wels was high (though it is difficult to say if these fish were stocked or the result of natural reproduction). In others (e.g. Landštejn), zander Sander lucioperca were not registered by either sampling method, despite intensive stocking. Overall, gill netting alone appears inadequate for gaining a true picture of the fish community in reservoirs and we suggest a combination of electrofishing and gill netting in future.
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Lebeau, Bernard. "Oocyte recruitment and spawning chronology in pike, Esox lucius, and muskellunge, Esox masquinongy." Canadian Journal of Zoology 69, no. 8 (August 1, 1991): 2194–201. http://dx.doi.org/10.1139/z91-306.
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During the reproductive cycle, the progression of oogenesis differs markedly between northern pike, Esox lucius Linnaeus, and muskellunge, Esox masquinongy Mitchill. Both species have group-synchronous ovaries but have different oocyte recruitment strategies. Pike is a single spawner, developing eggs in a single clutch annually, whereas muskellunge is a fractional spawner, producing two clutches of eggs per year. During the spawning period in large female muskellunge, oocyte counts indicate that the second clutch of eggs is equally important to the first. An event portrait of the spawning period for muskellunge is provided, whereby arrival of adults to a spawning site, egg yield, and hatching success agree with the fractional spawner concept. A hypothesis of the temporal sequence of evolutionary relationships in recruitment of oocytes for esocoid fishes is presented. The reproductive strategy of muskellunge belongs to a common esocoid ancestor, whereas that in pike is derived and unique. The significance of this divergence in closely related species remains consistent with the ecological theory that evolution of reproductive strategies is adaptive to diverse environmental conditions.
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Crossman, E. J. "Reproductive Homing in Muskellunge, Esox masquinongy." Canadian Journal of Fisheries and Aquatic Sciences 47, no. 9 (September 1, 1990): 1803–12. http://dx.doi.org/10.1139/f90-205.
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The number and nature of muskellunge moving to and from spawning grounds are extensively documented. Individual spawning muskeliunge in Stony Lake, Ontario are considered to home annually to specific spawning grounds and to specific areas (spawning sites) within spawning grounds. Some individuals were caught in the same location, or a nearby location, in as many as 7 yr. There is some evidence for discrete populations with apparent reproductive isolation and no interchange in summer. Dispersal from spawning grounds to summer home ranges seems to be limited in regard to direction and area of the lake. Recapture of fish on spawning grounds suggests an obligatory return to a limited number of "traditional" spawning grounds and may extend our knowledge of the groups of fishes exhibiting this type of directed movement. The results also have serious implications for muskellunge in regard to management, shoreline development, and genetic contamination by fish culture activities.
Dissertations / Theses on the topic "Esox – Reproduction"
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Bry, Christian. "Reproduction contrôlée du brochet (Esox lucius) et dynamique des jeunes stades en petits étangs : aspects zootechniques et écologiques." Lyon 1, 1992. http://www.theses.fr/1992LYO10292.
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En premiere partie, sont presentes la biologie, la gestion en milieu naturel et les methodes d'elevage du brochet. L'outil experimental principal est constitue par une batterie d'etangs de 300 m#2, localisee dans le departement de la somme. La seconde partie demontre l'interet de separer les fratries de jeunes brochets et propose une methode originale de reproduction-pregrossissement, la reproduction naturelle amenagee. Les productions, en nombre (2-3 juveniles de 2-3 g/m#2) et biomasse (50-70 kg/ha), obtenues avec cette technique ne different pas significativement de celles des mises en charge classiques basees sur des embryons libres. De plus, le taux de survie des reproducteurs est plus eleve apres reproduction naturelle qu'apres utilisation en ecloserie. Des precisions techniques relatives a la mise en uvre de cette methode sont apportees a l'intention des utilisateurs potentiels. La troisieme partie analyse la dynamique des jeunes stades en etang. Les taux de mortalite sont plus eleves au cours de certaines etapes du pregrossissement, sans que l'on puisse parler de veritables periodes critiques. Les vitesses de croissance aux differents stades sont particulierement elevees, et la biomasse peut atteindre 180 kg/ha. Il est possible de relier la taille des jeunes au regime thermique des etangs. Le regime alimentaire comporte d'abord des microcrustaces de plus petite dimension superieure a 150 micrometres, avec une preference pour les copepodes, ainsi que pour les cladoceres de grande taille. Les proies suivantes sont des larves de chironomides et des macrocrustaces. Malgre une variabilite inter-etangs de la teneur en zooplancton et de la composition des contenus stomacaux, l'evolution ontogenetique du regime alimentaire obeit a une certaine reproductibilite, dans le temps comme dans l'espace. Le cannibalisme, observe uniquement entre juveniles, est fonction de la densite larvaire initiale. Les brochets cannibales selectionnent des brochets-proies de taille relative importante (66% en moyenne) et les ingerent tete la premiere. En quatrieme partie, une reflexion d'ensemble est engagee sur la reproduction naturelle amenagee, les facteurs de regulation des effectifs de jeunes brochets, et l'interet des etangs experimentaux
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Souchon, Yves. "Reproduction du brochet (Esox lucius,L. 1758) et développement des brochetons en Dombes : éléments d'optimisation des modes de gestion extensive." Lyon 1, 1985. http://www.theses.fr/1985LYO10514.
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Manelphe, Jean. "Reproduction naturelle aménagée du brochet (Esox lucius) en petits étangs : suivi biologique et aspects économiques de la production de juvéniles." Toulouse, INPT, 1989. http://www.theses.fr/1989INPT022A.
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La reproduction naturelle amenagee du brochet (esox lucius l. ) est une methode permettant de produire, en petits etangs et selon une formule extensive, des juveniles destines au milieu naturel ou aux etangs de polyculture. La fiabilite technique globale de cette methode ayant ete prealablement etablie, ce travail en aborde certains aspects biologiques et economiques. Dans une premiere partie, des resultats experimentaux, obtenus de 1985 a 1988 dans les petits etangs de l'esociculture du paraclet (somme), sont rapportes: des taux d'embryonnement eleves (80% en moyenne) sont generalement observes en reproduction naturelle, l'incidence de la temperature de l'eau sur la survie embryonnaire s'avere limitee tandis que celle des macroinvertebres predateurs apparait plus importante (taux de mortalite moyens incombant respectivement a ces deux facteurs: 8% et 34%), aucun des facteurs precedemment mentionnes ne semble en mesure de provoquer l'extinction de la fratrie, le taux de survie du stade ovocyte au stade embryon en fin de resorption est en moyenne de 46%, l'evolution de differents parametres (survie, biomasse, structure de la fratrie et regime alimentaire) a ete etudiee au cours de la phase de pregrossissement jusqu'au stade 15 g (a titre indicatif, les biomasses produites sont de l'ordre de 80 kg/ha au stade 2 g et atteignent 200 kg/ha aux stades 10-15 g). Les differents elements recueillis permettent de decrire la cinetique de la survie du stade ovocyte au stade juvenile de 15 g. Dans une deuxieme partie, une evaluation economique basee sur les donnees de quatre esocicultures montre qu'une rentabilite interessante peut etre escomptee, malgre l'heterogeneite des sites et de comportement des investisseurs (revenu agricole moyen: 20000 f 1986/ha terrain/an). L'ensemble des resultats obtenus conforte la robustesse de la methode et permet d'en expliquer certains points de variabilite
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Souchon, Yves. "Reproduction du Brochet (Esox lucius, L. 1758) et développement des prochetons en Dombes éléments d'optimisation des modes de gestion extensive." Grenoble : ANRT, 1985. http://catalogue.bnf.fr/ark:/12148/cb37595184d.
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PLAŇANSKÝ, Tomáš. "Odběr spermatu pomocí katetru a jeho využití při výtěru štiky obecné (Esox lucius L.)." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-375935.
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The aim of this diploma thesis is to compare quality of northern pike sperm collected by different methods. First method is collection of stripped sperm by abdominal massage of the belly. Second method is collection of stripped sperm with special catheter to eliminate sperm contamination by urine. The last method is collection of testicular sperm. Differently collected sperm was evaluated and compared its quality. The main observed parameters were sperm volume, spermatozoa concentration, spermatozoa motility and velocity and osmolality of seminal fluid. Sperm samples were used for eggs fertilization. In fertilized eggs, the fertility of eggs and larvae hatching rate were observed.
Books on the topic "Esox – Reproduction"
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Procel Aguiño, Julio Hugo, Jorge Aleghery Merchán Villamar, Johnny Wimper Potes Duque, Ketty Angélica Romero Batallas, Fabricia Georgina Macías Cedeño, Johanna América Linares Rivera, Andrés Gonzalo Cevallos Andrade, Gloria Herlinda Bravo Loor, Rafael Bolívar Maldonado Manzano, and Christian Heinz Linares Rivera. Fundamentos teórico-prácticos y riesgos de la GÍNECO-OBSTETRICIA. Mawil Publicaciones de Ecuador, 2020, 2020. http://dx.doi.org/10.26820/978-9942-826-36-7.
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Nuestra juventud generalmente es recordada por los constantes cambios de humor, percepción particular de las cosas, emoción de vivir la vida al máximo, disfrute del primer amor, salidas con los amigos, para compartir múltiples vivencias, entre otras tantas cosas que tardaríamos mucho tiempo en describirlas. La juventud es libertad, edad donde se percibe los no compromisos, las ganas de descubrir nuevas aventuras o situaciones. . Dentro de todo esto, nuestra primera relación o la primera vez que se hizo un contacto físico con la persona que se ama. La sensación con que se empezaban a descubrir la vida sexual. En esa etapa, se era muy vulnerable, y por supuesto, por nuestra inocencia e inmadurez no lo sabíamos. En algunos momentos se caminó sobre el filo cortante de poder traspasar a la relación sexual sin tomar en cuenta las consecuencias de esos actos. Muchos de nosotros contamos con el apoyo, asesoramiento y consejos de nuestros padres. Gracias a esta libertad y al enfrentar temas que para su tiempo eran tabú, nuestros padres tocaron la fibra que antes era imposible en nuestra sociedad. Esas conversaciones tuvieron éxito por ello hoy en día podemos decir que pudimos pasar el peligro de una enfermedad de transmisión sexual o de un embarazo no deseado gracias al uso de los preservativos que muy bien nos informó nuestra familia. Lamentablemente, muchos de nuestros amigos cercanos no pudieron pasar esa prueba sexual y cayeron, por decirlo de alguna manera, en el embarazo no deseado o en el padecimiento de alguna enfermedad de transmisión sexual como el virus del papiloma humano, tan común en nuestra sociedad. Ellos no contaron con la asesoría sobre prevención y sus vidas cambiaron drásticamente. Muchos no pudieron culminar sus estudios por la obligación de convertirse en padres y madres de familia a temprana edad. Hoy, por supuesto, son personas de bien que luchan día a día por mantener a sus hijos e inculcarle los valores que no pudieron gozar en su tiempo. Es por ello se considera que la familia, la escuela y demás medio y organizaciones constituyen la punta de lanza para prevenir todo lo concerniente a aquellas situaciones que vulneren la salud sexual y reproductiva. Son los padres quienes deben llevar esta batuta e inculcarles a sus hijos los cuidados que se deben tener para cualquier momento de la vida. Aunado al pilar de la sociedad se encuentran muchas organizaciones, que buscan prevalecer esa prevención y los derechos de los individuos en la sociedad. Una de ellas es la medicina a través de la gíneco-obstetricia. Esta ciencia busca siempre, a través de métodos científicos, diagnosticas, tratar y controlar todo lo referente al aparato reproductor femenino desde la sexualidad, la fecundación y el nacimiento de un ser vivo. Esta rama de la medicina es la permite identificar las causas, los efectos y los síntomas que puedan tener las mujeres en relación a la salud sexual y reproductiva. La importancia de una constante visita al médico es fundamental para tener una mejor calidad de vida. De aquí la importancia de este libro la cual engloba, en cierto modo, los aspectos más importantes del desarrollo sexual y reproductivo de la mujer y da como protagonismo e importancia su significado en la sociedad como ser humano, así como también los eventos que implica su etapa reproductiva.
Book chapters on the topic "Esox – Reproduction"
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"Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists." In Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists, edited by Timothy D. Simonson. American Fisheries Society, 2017. http://dx.doi.org/10.47886/9781934874462.ch32.
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<em>Abstract</em>.—Wisconsin’s Muskellunge <em>Esox masquinongy </em>populations support important recreational and tribal fisheries. The objective of this study was to determine if temporal trends in Muskellunge populations and fisheries were consistent with overall management goals of sustaining viable populations and providing a trophy fishery. Indices of population abundance, angler use, and size-structure in Wisconsin lakes were tested for linear temporal trends from 1980 to 2015. Estimates of abundance of Muskellunge remained relatively unchanged through time. Likewise, angler effort and success changed little, as measured by access-point creel surveys, but tournament angler success improved, as measured by catches of Muskellunge by contest participants, who are presumably more intensive Muskellunge anglers. Available information suggests that restrictive fishing regulations, combined with voluntary release of legal-sized Muskellunge, reduced annual harvest and exploitation to low levels, thereby increasing size-structure of Wisconsin Muskellunge populations, compared with the 1980s. Although specific waters may still experience high harvest, low abundance, low size structure, or low angler success, the current status of Wisconsin’s Muskellunge fishery appears strong compared to the 1980s, and overall goals of sustaining populations and providing trophy fishing are being met. The relative influence of stocking versus natural reproduction needs further consideration.
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"Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists." In Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists, edited by Kyle D. Battige, James S. Diana, and David C. Rowe. American Fisheries Society, 2017. http://dx.doi.org/10.47886/9781934874462.ch23.
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<em>Abstract</em>.—The identification, protection, and restoration of spawning habitat for Muskellunge <em>Esox masquinongy </em>in Green Bay, Lake Michigan are vital steps for re-establishing a self-sustaining population. This study was designed to locate spawning areas, document and model spawning habitat preferences, assess natural recruitment, and determine if suitable habitat was found throughout Green Bay (Fox River, lower Green Bay, Menominee River, and Little Sturgeon Bay). Radio transmitters were inserted into the oviduct of mature female Muskellunge prior to spawning and expelled transmitters were later located using radio telemetry to identify spawning locations. Between 2009 and 2010, 26 of 37 (70%) implanted transmitters were located as deposited at spawning locations. Using identified spawning locations, habitat selection was estimated for key environmental variables, and MaxEnt (maximum entropy) was utilized to model Muskellunge spawning habitat in the Menominee River, as it was the only study area where natural reproduction was documented. Menominee River Muskellunge showed significant preferences for spawning in areas with shallow bottom slopes (5%), with medium-to-high submerged aquatic vegetation coverage (>33%), where coarse woody debris was present, and where dominant substrates were sand or cobble. MaxEnt modeling predicted a ~2.5 magnitude greater likelihood of spawning at an average spawning location compared to an average background location. Comparisons of available habitat among study areas showed the Menominee River contained more spawning habitat with preferred characteristics. Results from this study are important steps in identifying spawning habitat as a potential limiting factor to successful Muskellunge reintroduction and models could be used to locate suitable areas to stock and guide delineation of critical spawning habitat to designate for protection.
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"PROTOCOLS FOR THE CRYOPRESERVATION OF SALMONIDAE SEMEN, Lota lota (GADIDAE) and Esox lucius (ESOCIDAE)." In Methods in Reproductive Aquaculture, 395–406. CRC Press, 2008. http://dx.doi.org/10.1201/9780849380549-29.
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"Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists." In Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists, edited by John M. Casselman, Jonah L. Withers, and Thomas J. Howson. American Fisheries Society, 2017. http://dx.doi.org/10.47886/9781934874462.ch1.
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<em>Abstract</em>.—Sustainability of trophy Muskellunge <em>Esox masquinongy </em>populations and fisheries was examined from Muskies, Inc. catch data (335,954) from 43 years (1971–2013), along with more than 35 years (late 1970s–2013) of trophy Muskellunge data and cleithra (2,633) submitted to the Cleithrum Project. Catch has increased substantially over the past five decades, but harvest has been greatly reduced because of increased size limits (e.g., in Ontario, set by using growth potential) and voluntary catch and release of legal-sized fish promoted by organized Muskellunge anglers. The Cleithrum Project exemplifies cooperative interaction; although fewer samples have been submitted in recent years, length, weight, and age have increased significantly. Pivotal change occurred in the mid-1990s (means for late 1970s–1994, total length 108.7 cm, total weight 9.7 kg, age 11.6 years; 1995–2013, 121.0 cm, 13.4 kg, 15.1 years). A predictive mortality rate–longevity relationship was used on the Cleithrum Project age data to estimate mortality rate of trophy Muskellunge. Annual mortality rate (<EM>A</EM>) of trophy Muskellunge usually ranged from 16% to 26% and corresponded to maximum ages of 24 to 14 years. Estimated annual mortality of the oldest Muskellunge increased slightly over the past 35 years—13.0% to 14.3%, with a decrease in maximum age from 30 to 27 years. Mortality was high to the mid-1990s but has decreased subsequently, even though angling pressure has increased. Size and mean age of trophy Muskellunge have increased substantially (10.2 to 15.8 years) with associated decreases in annual mortality (<EM>A</EM>, 31.0% to 21.9%), indicating an increase in the mature population and reproductive potential. To ensure sustainable trophy Muskellunge populations, fish younger than 15 years should not be exposed to fishing mortality and older fish should not have a fishing mortality rate that exceeds the rate of natural mortality (<EM>F ≯</EM> <EM>M</EM>). Management for large size (older age) by using excessive size limits, in combination with catch and release, can have unexpected outcomes because older fish are increasingly sensitive to stress (e.g., viral hemorrhagic septicemia [VHS] mortalities). If Muskellunge populations are managed for high reproductive capacity (protecting fish to larger size and older age), they will be more reproductively resilient, producing larger year-classes, better sustaining trophy populations and fisheries.
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"Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists." In Muskellunge Management: Fifty Years of Cooperation Among Anglers, Scientists, and Fisheries Biologists, edited by Jonathan R. Meerbeek and Derek P. Crane. American Fisheries Society, 2017. http://dx.doi.org/10.47886/9781934874462.ch46.
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<em>Abstract</em>.—Managers seldom sample sufficient numbers of Muskellunge <em>Esox masquinongy </em>to develop population specific weight–total length (TL) models and often rely on existing models to predict Muskellunge weight. However, substantial variation exists among these models and managers and anglers may be forced to report inaccurate Muskellunge weight estimates. We used TL, maximum girth, pectoral girth, sex, and adult female reproductive status data obtained from 869 anesthetized adult Muskellunge collected from three natural lakes in Iowa between 2012 and 2015 to identify the most important variables for estimating Muskellunge weight. We also compared the predictive performance of our model to five popular models for estimating Muskellunge weight using test data from Iowa Muskellunge and data from an outside population. Stepwise model selection identified a model including terms for TL, maximum girth, and pectoral girth as having the lowest Bayesian information criterion value; however, post hoc analyses of model accuracy found that a two-variable model including terms for TL and maximum girth was negligibly different from the three-variable model. Therefore, we selected the TL–maximum girth model as the best model and for use in additional analyses of model accuracy. Of the six models compared, our model and the Casselman and Crossman (1986) model performed well across the range of weights tested using the Iowa test data set; on average, estimated weights were within 2.7–5.5% of measured weights. All other models either grossly under- or overestimated Muskellunge weight. Model accuracy for all tested models decreased substantially when tested using data from the Georgian Bay Muskellunge population, especially for fish greater than 30 lb [13.6 kg]. Although our model and the Casselman and Crossman (1986) model will provide managers with weight estimates that are suitable for use in most fishery-management applications, they may not be suitable for anglers attempting to determine if angled Muskellunge are of record weight. In populations where extreme morphological differences may occur or robust weight–TL models need to be developed, we recommend that population specific models be developed to estimate Muskellunge weight.
Conference papers on the topic "Esox – Reproduction"
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Martí Testón, Ana. "IMAGINANDO LOS LUGARES E IDEALIZANDO EL ARTE A TRAVÉS DE LA FOTOGRAFÍA E INTERNET." In I Congreso Internacional sobre Fotografia: Nuevas propuestas en Investigacion y Docencia de la Fotografia. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/cifo17.2017.6763.
Full textAbstract:
La reproducción fotográfica de los objetos incluidos en los museos y las colecciones de arte es una práctica habitual que ha venido siendo utilizada desde el nacimiento de la fotografía en 1839. Igualmente, y de manera similar, en el siglo XIX se popularizó el uso de la fotografía para registrar los viajes de los exploradores decimonónicos, con la intención de mostrar aquellos lugares inaccesibles a la mayoría de la sociedad del momento. Desde el nacimiento de la fotografía, ésta ha sido considerada como una herramienta ideal para clasificar la realidad y establecer testimonios de las experiencias vividas. Aquel impulso decimonónico de localizar, registrar y controlar el patrimonio sigue presente en nuestra sociedad. Los museos están digitalizando sus colecciones compulsivamente con la intención de hacerlas más accesibles a la sociedad. Desde 2008, la mayoría de museos y archivos han gastado y están gastando grandes cantidades de dinero y tiempo en digitalizar sus colecciones. Grandes proyectos como Google Art Project o Europeana pretenden acercar la cultura a la sociedad eliminando determinadas barreras físicas a través de internet. Sin embargo, estas iniciativas están lejos de demostrar que sirvan por sí mismas de incentivo real para aumentar el interés de la sociedad por este patrimonio. Probablemente, la causa de este impulso registrativo sea la necesidad común de generar un imaginario visual colectivo que nos sirva para entender nuestra cultura. Esa ambición de transmitir el conocimiento y acercar estos lugares y objetos a la sociedad, ha logrado que se produzca una gran cantidad de imágenes que hoy en día están conservadas en museos y archivos de todo el mundo. Pero aquellos lugares lejanos que fueron registrados por las cámaras de los calotipistas durante el siglo XIX aparecieron representados en las fotografías mediante escenas idealizadas. Probablemente, los viajeros románticos mostraron aquellos lugares bajo su ideal colonialista. Del mismo modo, la reproducción insaciable de determinadas obras de arte y monumentos en postales o libros, no han hecho más que incidir en la creación de esos iconos idealizados. Tratados como símbolos, se han consagrado en los idearios de la sociedad. Actualmente, utilizamos Internet para acceder a las colecciones de los museos y trasladarnos mentalmente a aquellos lugares idealizados, así como para compartir en las redes sociales las fotografías de nuestras experiencias vividas, tanto de los viajes como de las visitas a museos. No obstante, la gran diferencia que existe entre el siglo XIX y la actualidad estriba en que en el presente estamos sobre saturados de imágenes. Esa misma capacidad reproductiva de la fotografía ha logrado que nos saturemos perdiendo así esa capacidad de idealización.