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Induction of female monosex polyploid Yellow perch (Perca flavescens) and production of monosex stocks in order to increase efficiency of Yellow perch aquacultureMiller, Mackenzie E. January 2020 (has links)
No description available.
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Sex Reversal in Yellow Perch (Perca flavescens) to Produce Functional Neomale Sperm DonorsTowne, Kristen Marie January 2016 (has links)
No description available.
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Novel aspects of bighead carp sperm storage and larval/juvenile rearing to address control of invasive Asian carp in the USAFisher, Kevin J. January 2020 (has links)
No description available.
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Analýza ichtyofauny České republiky se zaměřením na invazivní druhy / Analysis of ichtyofauna of the Czech Republic focused on alien speciesGoldstein, David January 2012 (has links)
This thesis analyzes the ichthyofauna in Czech Republic in historical terms, i.e. how was the data on the occurrence of native species of fishes and lampreys collected. Particular attention is given to species alien to this territory - the following species are elaborated in more detail: Carassius auratus, Ameiurus nebulosus, Pseudorasbora parva, Ctenopharyngodon idella, Hypophthalmichthys molitrix, Aristichthys nobilis, Gasterosteus aculeatus, Coregonus maraena,Coregonus peled, Acipeneser baerii, Acipeneser stellatus, Acipenser gueldenstaedtii. The history of the introductions, the current situation in the Czech Republic and the impact on native ichthyofauna are listed (a more detailed evaluation of invasiveness is included for Carassius auratus, Pseudorasbora parva). Finally, the efforts to enrich the local ichthyofauna by introducing new species are generally evaluated.
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Sustentabilidade ambiental do cultivo intensivo de Til?pias (Oreochromis niloticus) em tanques-rede e a capacidade de suporte de quatro reservat?rios em uma regi?o semi-?rida tropicalRocha, Elinez da Silva 28 August 2006 (has links)
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Previous issue date: 2006-08-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Intensive production of til?pias, in cages or net tanks, has been proposed as an alternative to increase fish production, that would generate income and offer animal protein in different tropical and subtropical countries. However, this system of production enriches the aquatic environment with nutrients, principally nitrogen and phosphor derived from the dejections of the metabolism of food and eventual food surpluses consumed by the fishes; the alimentation of the fishes in this production modality is dependent on fish food. The emission of these nutritions in levels above the limit that the system is capable metabolize can provoke a phenomenon called eutrofization, putting in risk the quality of water for public and for fish production activities. In this context the work had as a goal to evaluate the tr?fico state of the four reservoirs for intensive production of tilapias in net-tanks, in other words, he maximum fish production that the reservoirs are able to hold, keeping the desired quantity of nutrient concentrations in water for public use. The results of the four ecosystems in the Boqueir?o de Parelhas reservoir showed that it s possible to have an intensive production of tilapias in net tanks, in this environment the annual average concentration of phosphor, was below the considered critical limits to deflagrate the process of eutrofization in semi-arid regions. The carrying capacity of the Boqueir?o de Parelhas reservoir depends on the conversion of the feeding facts and phosphor content in the food but it should vary between 100 and 300 tons per year over a variation in the conversion feeding factor of 1,7 to 2,0:1 and a variation in the P in the food of 0,7 to 0,9% / O cultivo intensivo de til?pias, em gaiolas ou tanques-rede, tem sido proposto como uma alternativa para aumentar a produ??o pesqueira, a gera??o de renda e a oferta de prote?na animal em diversos pa?ses tropicais e subtropicais. No entanto, esse sistema de produ??o enriquece o ambiente aqu?tico com nutrientes, principalmente o nitrog?nio e o f?sforo, oriundos dos dejetos do metabolismo do alimento e com eventuais sobras de alimentos n?o consumidos pelos peixes; uma vez que a alimenta??o dos peixes nessa modalidade de cultivo ? extremamente dependente do aporte de ra??o. A emiss?o desses nutrientes em n?veis acima do limite que o sistema ? capaz de metabolizar pode provocar o fen?meno da eutrofiza??o, comprometendo a qualidade da ?gua do manancial para o abastecimento p?blico e para a pr?pria atividade de piscicultura. Diante deste contexto, este trabalho teve como objetivo avaliar o estado tr?fico de quatro reservat?rios em uma regi?o semi-?rida tropical e estimar a capacidade de suporte dos reservat?rios para o cultivo intensivo de til?pias em tanques-rede, ou seja, a produ??o m?xima de peixes que os reservat?rios s?o capazes de sustentar mantendo as concentra??es de nutrientes na ?gua dentro dos limites considerados desej?veis para reservat?rios destinados ao abastecimento p?blico. Os resultados demonstram que dos quatro ecossistemas estudados, apenas no reservat?rio de Boqueir?o de Parelhas ? poss?vel o cultivo intensivo de til?pias em tanques-redes, uma vez que neste ambiente a concentra??o m?dia anual de f?sforo, esteve abaixo do limite considerado cr?tico para deflagrar o processo de eutrofiza??o em reservat?rios de regi?es semi-?ridas. A capacidade de suporte do reservat?rio Boqueir?o de Parelhas depende do fator de convers?o alimentar do peixe e do conte?do de f?sforo na ra??o mas deve variar entre cerca de 100 e 300 toneladas de peixe por ano assumindo uma varia??o no fator de convers?o alimentar de 1,7 a 2,0:1 e uma varia??o no conte?do de P na ra??o de 0,7 a 0,9%
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Estratégia alimentar e densidade de estocagem para acarádisco (Symphysodon aequifasciata) / Feeding strategy and stocking density for discus fish (Symphysodon aequifasciata)BEERLI, Eduardo Lopes 29 May 2009 (has links)
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Previous issue date: 2009-05-29 / Four diets were tested to verify the effect of beef heart as feed enhancer for discus
fish, studding the growth, weight gain, survivor, consumption, water quality and
economic performance variables. Is was utilized 12 aquariums, distributed in 4
treatments and 3 replications. The treatments were: T1- 100% ration (42%PB); T2-
75% ration and 25% beef heart; T3- 50% ration and 50% beef heart and T4- 25%
ration and 75% beef heart. The diets were feed until fish s satiation, twice by day,
at 8:00h and 17:00h. After each feed time, 40% of water was changed. Each
aquarium contained 20 fishes, totalizing 240 discus fishes. The following water
quality parameters were available: pH, dissolved oxygen, temperature and
ammonia. There wasn`t effect of treatments on survivor. The dry matter
consumption was higher in 50% and 75% of beef heart diets, and better growth
and weight gain were obtained, but 50% of beef heart were at a low price, and
were considered the best diet. The relative condition factor (Kn) analysis indicate
better body condition of fishes according beef heart was higher in tested diets. The
economic performance shows that 75% of beef heart obtain lower cost index, but
50% of beef heart obtain higher partial liquid income. However beef heart diets
turn water cloudy, the analyzed water quality parameters keep suitable for fishes.
The conclusion is that beef heart is efficient as feed enhancer for discus fish and
that 50% of beef heart with 50% of ration provide better performance and higher
economic gain. / Foram elaborados dois experimentos para obter dados zootécnicos que auxiliem
a produção comercial do acará-disco (Symphysodon aequifasciata), com os
seguintes objetivos: a) verificar a eficácia da adição de coração de boi como
estimulador de consumo, sobre as variáveis de desempenho, sobrevivência,
consumo, qualidade de água e desempenho econômico; b) avaliar o efeito da
densidade de estocagem sobre o desempenho do acará-disco e obter
informações econômicas para determinar qual a melhor densidade para cultivo
desta espécie em aquários. No primeiro experimento foram utilizados 12 aquários,
com 20 peixes, totalizando 240 acará-disco, divididos em quatro tratamentos e
três repetições. Os tratamentos foram: T1- 100% ração (42%PB); T2- 75% ração
e 25% coração de boi; T3- 50% ração e 50% coração de boi e T4- 25% ração e
75% coração de boi. As dietas foram fornecidas aos peixes até a saciedade, duas
vezes por dia, nos horários de 8:00h e 17:00h. Os tratamentos com 50% e 75%
de coração de boi proporcionaram crescimento e ganho de peso
significativamente superior, entretanto a dieta com 50% de coração de boi foi mais
econômica, sendo considerada a melhor. O segundo experimento recebeu a dieta
com 25% ração e 75% coração de boi. As dietas foram fornecidas aos peixes até
a saciedade, duas vezes por dia, nos horários de 8:00h e 17:00h. Foram testadas
densidades de 8, 12, 16 e 20 peixes/aquário. Os resultados foram submetidos a
análises de regressão e a densidade calculada que proporcionaria maior
desempenho seria de 17,5 peixes/aquário.
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Assisted Reproduction Techniques’ Effects on Sperm Physiology of the Freshwater Fish, Sauger (Sander canadensis)Blawut, Bryan Joseph January 2020 (has links)
No description available.
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Aging Juvenile Gulf Sturgeon From the Apalachicola River System, FloridaMoran, Kate Anne 25 May 2018 (has links)
No description available.
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IsotopeLadrick, Alice 21 August 2012 (has links)
No description available.
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Assessment of Site-Fidelity and Straying in Lake Erie Steelhead TroutBudnik, Richard R. 24 April 2017 (has links)
No description available.
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