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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Selected experiments on growth and food conversion efficiency of bluegill, Lepomis macrochirus

Kaufman, Donald G. January 1973 (has links)
Experiments were conducted to determine the effect of aquarium volume and feeding regimen on growth in length and weight and on food conversion efficiency by bluegill fed rations of mealworms. Two 30 day periods were utilized for each study. Part one, which examined the effect of aquarium volume on growth extended from January 20 to February 18 and from March 27 to April 25, 1972. Part two, which examined the effect of multiple feedings compared with single feedings on growth, ran from May 30 to June 28 and from July 1 to July 30, 1972. The studies were conducted in a controlled environment aquarium. Food consumption, growth and food conversion by individual fish in each experiment were monitored closely. All conditions with the exception of the testable variable were held as constant as possible. Water quality was monitored and judged to be within acceptable limits for fish culture.Aquarium volumes of 5, 10 and 15 liters did not affect growth in length and weight or food conversion efficiency of individually held bluegill.A 30 day daily regimen of one feeding compared with three feedings of a constant ration of mealworms resulted in significantly greater length, weight and conversion efficiency for multiple-fed male bluegill. After 60 days length and weight were not significantly different but conversion efficiency was significantly greater for multiple-fed male bluegill.
2

The food habits of the alewife in Indiana waters of Lake Michigan in 1970

Rhodes, Raymond J., 1946- January 1971 (has links)
Food habits of the alewife, Alosa pseudoharenous, were studied in Indiana waters of Lake Michigan at 10 m (32.8 ft.) stations o transects at Burns Ditch and Michigan City from June to October, 1970. Organisms in stomachs were expressed as percent of the total volume, percent frequency of occurrence, and percent composition.Food selectivity of the alewife was studies at the 10 m station on Michigan City transect. Plankton samples were taken concurrently with fish samples and percent composition of various food items in plankton and stomach samples were compared to elucidate selection with an electivity index.The occurrence of copepods and cladocerans in alewife stomachs from Burns Ditch and Michigan City transects was similar; however, Michigan City alewife stomachs had three more cladoceran species than Burns Ditch samples. Oligochaetes were not present in any Michigan City stomach samples, and Pontoporeia affinis was not found in any Burns Ditch samples. When comparing these two sample sites, the alewife food habit differences may be due to difference in substrate, water quality, and the influence of the Burns Ditch river mouth.Based upon frequency of occurrence and percent volume, zooplankton comprised the largest portions of food in adult alewife (140 mm [5.5 in.] and greater) alewife stomach samples taken from June to October in 10 m of water on Michigan City transect. Cladoceran occurrence and percent volume in alewife stomachs increased monthly from June to September and October. Cyclops bicuspidatus, the major food item contributing to copepod percent volume in alewife stomachs, generally declined from July to October.Alewife size, for fish ranging from 140-169 mm (5.5-6.6 inc.) and 170-189 m (6.7-7.4 in.) did not appear to influence percent volume and frequency of occurrence of major food items consumed. Food selectivity of the two size groups was also similar for planktonic food species examined.Alewives ranging from 140-189 mm selected positively for the female Cyclops bicuspidatus while copepodites were always negatively selected. During October, large cladocerans, Leptodora and Daphnia, were positively selected. Although Diaptomus spp. Were similar in size to the female Cyclops, it was always negatively selected. The alewife selection for Bosmina longirostris was strongly negative in June, July, and October, but ws near random in August and September. Since the B. longirostris density in August and September was relatively high, the near random E values may indicate random filter feeding by the alewife. Prey size, mobility, and density appear to be major influences on adult alewife food selection.
3

Review of food safety policy in Hong Kong : challenges brought by ciguatera on the safe consumption of live reef fish /

Yeung, Lau-kong. January 2006 (has links)
Thesis (M. Sc.)--University of Hong Kong, 2006.
4

Frequência alimentar e níveis de proteína no desempenho e na primeira maturação sexual em Rhamdia quelen criados em tanque-rede

Ribeiro, Raphaela Rezende [UNESP] 04 June 2012 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:28:27Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-06-04Bitstream added on 2014-06-13T20:58:12Z : No. of bitstreams: 1 ribeiro_rr_me_botfmvz.pdf: 370485 bytes, checksum: 1c93b70938565887e570cdb0eedc44ae (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Universidade Estadual Paulista (UNESP) / A influência de fatores ambientais, o manejo alimentar e a qualidade da ração são determinantes na formação de reprodutores e no manejo reprodutivo, podendo influenciar nos custos de insumos e na qualidade dos alevinos produzidos. O presente estudo teve como finalidade avaliar o desenvolvimento gonadal do Rhamdia quelen em tanque-rede até a primeira maturação sexual com diferentes níveis de proteína e frequências alimentares, verificando a influência desta fase no crescimento dos peixes cultivados. O experimento foi realizado de agosto a novembro de 2011 em viveiro escavado com renovação diária de 5%. O delineamento foi o inteiramente casualizado no modelo fatorial, com duas frequências alimentares (3 e 24 vezes/dia) no período noturno e com dois níveis de proteína (28 e 32% PB) com ingredientes de origem vegetal. Foram utilizados 864 jundiás com peso médio de 45 gramas, distribuídos em 24 tanques-rede. A maturação gonadal avançou à medida que o fotoperíodo e a temperatura aumentaram do mês agosto até novembro. As fêmeas alcançaram sua primeira maturação sexual com 72,6 g (±18,4) e comprimento de 20,2 cm (±2,1) e os machos alcançaram sua primeira maturação sexual com 70,3 g (±25,8) e comprimento de 19,5 cm (±1,9). A frequência alimentar influenciou na maturação sexual de fêmeas de Rhamdia quelen / The influence of environmental factors, feeding management and feed quality are crucial in the establishment of breeding and reproductive management, it can influence the costs and quality of fingerlings produced. The present study was to evaluate the development of gonadal of Rhamdia quelen raised in cages until the first maturity with different levels of protein and feeding frequency, and the influence of this phase on the growth. The experiment was conducted from August to November 2011 in earth pond with water daily renewal of 5%. The design was completely randomized in factorial design with two feeding frequencies (3 and 24 times / day) at night and two protein levels (28 and 32% CP) with ingredients of plant origin. We used 864 silver catfish with an average weight of 45 grams, distributed in 24 cages. The maturation developed as the photoperiod and temperature increased during the months August to November. The females reach their sexual maturity with 72.6 g (± 18.4) and length of 20.2 cm (± 2.1) and males reached their sexual maturity with 70.3 g (± 25.8) and length of 19.5 cm (± 1.9). The sexual maturation of Rhamdia quelen female was influenced by feeding frequency
5

Particulate and filter feeding in the threadfin shad,Dorosoma petenense (Günther), at different light intensities

Holanov, Stephen Howard, 1951- January 1977 (has links)
No description available.
6

Shrimp processing waste as a pigment source for rainbow trout (Salmo gairdneri)

Steel, Ronald Edward 10 May 1971 (has links)
Graduation date: 1971
7

Chemical and physical alterations of frozen whitefish and bovine skeletal muscles

Awad, Ahmed Ali, January 1967 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
8

Food habits of brook trout in relation to the abundance of diel drift invertebrates in the Little Colorado River

McClain, John Rex, 1948- January 1976 (has links)
No description available.
9

Parâmetros bioquímicos e enzimáticos para jundiá (Rhamdia quelen) alimentados em alta e baixa frequência com diferentes níveis de proteína

Sousa, Paula Novelli Ramalho de [UNESP] 25 June 2012 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:27:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-06-25Bitstream added on 2014-06-13T19:35:44Z : No. of bitstreams: 1 sousa_pnr_me_botfmvz.pdf: 337337 bytes, checksum: 7a71ded50004a8af9f381a8ecefa04d3 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Universidade Estadual Paulista (UNESP) / Nas várias atividades agropecuárias o manejo alimentar adequado é fundamental para se alcançar o melhor desempenho produtivo, assim como o correto balanceamento dos nutrientes oferecidos. O objetivo deste trabalho foi avaliar a influência dos níveis de proteína na ração e do número de ofertas de alimento ao dia sobre os parâmetros metabólicos e atividade das enzimas do metabolismo proteico, associados ao índice lipossomático (ILS) de 864 jundiás de 45g cultivados em tanque-rede. Os peixes foram alimentados por 60 dias com dieta contendo dois níveis de proteína (28 e 32%) e duas frequências de alimentação (três e 24 vezes ao dia), com seis repetições reproduzidas no tempo. Dois peixes de cada tanque foram abatidos no início, meio e final do trabalho para as análises bioquímicas. A atividade da enzima aspartato aminotransferase (AST) aumentou durante o tempo dos ensaios para a dieta com 28% de proteína e maior frequência. O aumento da concentração de glicose no sangue com a diminuição da proteína na dieta para a frequência alimentar de três vezes ao dia, assim como para a maior frequência com a dieta de 32% de proteína aos 30 dias, associadas à diminuição da atividade enzimática (AST) sugere que com a maior frequência o aumento da proteína dietética não é necessário para suprir as demandas metabólicas. Houve tendência de diminuição do glicogênio hepático para os peixes alimentados mais vezes ao dia com a dieta contendo 32% de proteína ao final do experimento, sendo a glicogenólise responsável pela manutenção dos níveis de glicose. Os níveis de proteínas plasmáticas foram maiores para os peixes alimentados com maior nível de proteína e menor frequência alimentar. A maior frequência pode melhorar o aproveitamento da ração com menor nível de proteína, direcionando a proteína da dieta para suprir as demandas proteicas e energéticas / The proper feeding management is important to achieve the best productive performance at the various agricultural activities, as well as the correct nutrients balance offered is indispensable. This study aimed at evaluating the influence of dietary protein levels and the number of food offerings per day on the metabolic parameters and the activity of protein metabolism enzymes, along with the liposomatic index (LSI) of 864 silver catfish of 45g grown in cages. The fish were fed 60 days with a diet containing two protein levels (28 and 32%) and two feeding frequencies (three and 24 times a day), with six replicates per treatment reproduced in time. Two fish per cage were slaughtered at the beginning, middle and end of the experiment for biochemical analysis. The aspartate aminotransferase enzyme activity (AST) increased during the experimental time for the diet with 28% protein level and higher feeding frequency. The increase in blood glucose concentration for the lower dietary protein level and the feeding frequency of three times a day as for to higher frequency with the diet of 32% protein at 30 days, associated with decreased enzyme activity (AST) proposes that increased dietary protein level is not required to meet the metabolic demands. There was a tendency of decreased hepatic glycogen for fish fed 24 times a day with the diet containing 32% protein at the end of the experiment, therefore glycogenolysis was responsible for maintaining glucose levels. The plasma protein levels were higher for fish fed with more protein in the diet and lower feeding frequency. Thus, the higher frequency can improve food utilization with a lower protein level, so the diet protein can be used to fulfill protein and energetic demand
10

Frequência alimentar e níveis de proteína no desempenho e na primeira maturação sexual em Rhamdia quelen criados em tanque-rede /

Ribeiro, Raphaela Rezende, 1983. January 2012 (has links)
Orientador: Claudio Angelo Agostinho / Banca : Margarida Maria Barros / Banca: Alexandre Ninhaus Silveira / Resumo: A influência de fatores ambientais, o manejo alimentar e a qualidade da ração são determinantes na formação de reprodutores e no manejo reprodutivo, podendo influenciar nos custos de insumos e na qualidade dos alevinos produzidos. O presente estudo teve como finalidade avaliar o desenvolvimento gonadal do Rhamdia quelen em tanque-rede até a primeira maturação sexual com diferentes níveis de proteína e frequências alimentares, verificando a influência desta fase no crescimento dos peixes cultivados. O experimento foi realizado de agosto a novembro de 2011 em viveiro escavado com renovação diária de 5%. O delineamento foi o inteiramente casualizado no modelo fatorial, com duas frequências alimentares (3 e 24 vezes/dia) no período noturno e com dois níveis de proteína (28 e 32% PB) com ingredientes de origem vegetal. Foram utilizados 864 jundiás com peso médio de 45 gramas, distribuídos em 24 tanques-rede. A maturação gonadal avançou à medida que o fotoperíodo e a temperatura aumentaram do mês agosto até novembro. As fêmeas alcançaram sua primeira maturação sexual com 72,6 g (±18,4) e comprimento de 20,2 cm (±2,1) e os machos alcançaram sua primeira maturação sexual com 70,3 g (±25,8) e comprimento de 19,5 cm (±1,9). A frequência alimentar influenciou na maturação sexual de fêmeas de Rhamdia quelen / Abstract: The influence of environmental factors, feeding management and feed quality are crucial in the establishment of breeding and reproductive management, it can influence the costs and quality of fingerlings produced. The present study was to evaluate the development of gonadal of Rhamdia quelen raised in cages until the first maturity with different levels of protein and feeding frequency, and the influence of this phase on the growth. The experiment was conducted from August to November 2011 in earth pond with water daily renewal of 5%. The design was completely randomized in factorial design with two feeding frequencies (3 and 24 times / day) at night and two protein levels (28 and 32% CP) with ingredients of plant origin. We used 864 silver catfish with an average weight of 45 grams, distributed in 24 cages. The maturation developed as the photoperiod and temperature increased during the months August to November. The females reach their sexual maturity with 72.6 g (± 18.4) and length of 20.2 cm (± 2.1) and males reached their sexual maturity with 70.3 g (± 25.8) and length of 19.5 cm (± 1.9). The sexual maturation of Rhamdia quelen female was influenced by feeding frequency / Mestre

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