Desenvolvimento de alevinos de trairão (Hoplias lacerdae) na ausência de luz

Sixty-six trairão (Hoplias lacerdae) fingerlings (average weight of 2.0±0.5 g and total length of 5.8±0.2 cm), trained to accept dry rations, were allotted to six 15-L aquariums, with aeration and controlled temperature (24.0±0.5°C), in a density of 0.7 juveniles/L, aiming to evaluate the effects of darkness on fish productive performance. The treatments consisted of two photoperiods: 12 hours light: 12 hours dark (12L:12D) and 0 hour light: 24 hours dark (OL:24D), with three replicates. Fingerlings were fed ad libitum a commercial extruded diet (42% CP), twice a day. The aquariums were cleaned daily for excrement withdrawal through siphoning, exchanging 1/4 total volume. At the end of the experiment (30 days), weight gain, feed:gain ratio and survival and cannibalism rates were evaluated. The results showed that darkness did not affect the productive performance of trairão juveniles.

Complexo enzimático na dieta de alevinos de kinguio (Carassius auratus)

Aiming to evaluate the enzymatic complex supplementation in diets for goldfish fingerlings (Carassius auratus), 240 fish weighing initially 1,36 ± 0,02g, randomly distributed in 20 tanks with 150L, in four treatments and five replications, with twelve fish in each experimental unit were used. The fish were fed at 8:00 and 11:00 a.m. and 2:00 and 5:00 p.m. with diets containing different inclusion levels (0; 0,033; 0,066 e 0,099%) of enzymatic complex (amilase, protease, celulase, lipase, â-glucanase and phytase), and formulated with 32,36% of digestible protein and 3.023kcal of digestible energy kg-1. There were no differences observed (P>0,05) in the mean final weight, weight gain, total length, standard length, survival and carcass composition. However, the fish apparent feed conversion was impaired by the supplementation of enzymatic complex with 0,099% in diet. The use of enzymatic complex does not provides benefits in the productive performance for goldfish fingerlings.

Quantificação de ácidos graxos de alevinos de tilápia do Nilo (Oreochromis niloticus) alimentados com diferentes fontes de óleos vegetais

The present work aimed to quantify the fatty acids in total lipids of Nile tilapia fingerlings (Oreochromis niloticus) fed with different sources of vegetable oils mechanically extracted. Were used 320 tilapias (O. niloticus) with average initial weight and average total initial length of 2.55±0.57 g and 5.59±0.43 cm, respectively, fed for a period of 60 days, in a randomized block design with eight treatments and four replications. The diets were prepared with 320 g/kg crude protein and 3.500 kcal of digestible energy per kg of feed enriched with eight different oils: sunflower, canola, sesame, linseed, peanut, Para's nut soy and macadamia, with an addition of 4%. Among the major fatty acids the oleic, palmitic, linolenic and linoleic were obtained in higher concentration (mg/g of LT) in fish from all treatments. The sums of polyunsaturated fatty acids after 60 days of cultivation had increased in all treatments compared to the 30 days of the experiment. This is due to the addition of oils with high contents of n-6 and n-3 fatty acids. The fatty acids in the carcass are a reflection of the energy source of oil used. As a conclusion it is recommended the use of linseed oil in the diet of tilapia fingerlings due to great improvement in the relationship between n-6/n-3.

Frequência de arraçoamento para alevinos de carpa comum

The best frequency of feeding for development of common carp fingerlings Cyprinus carpio was determined. Four hundred fish (4.88 ± 1.41 g and 6.72 ± 0.70 cm) were used, distributed in 20 tanks of 250 L each in completely randomized design with four treatments and five replicates. The four feeding strategies adopted were: providing feed once (T1), twice (T2), three (T3) and four times daily (T4) at the same amount being fractionated as described. At the end of 45 days of experiment were carried out measurements of the final weight (FW), final length (FL), weight gain (WG), feed conversion (FC), specific growth rate (SGR) and survivor (SR). It was evaluated the chemical composition of fish carcass: moisture (MT), crude protein (CP), lipids (LP) and ash (AS) and hematological analyzes performed such as erythrocyte (ER), hemoglobin (HG) and hematocrit (HT). There were significant statistical differences (P<0.01) for FW, FL, WG and SGR. For FC and SR there were no statistical differences (P>0.01). For the chemical composition the moisture, lipids and ash showed significant statistical differences (P>0.01), except only for protein (P>0.01) The hematological composition was not influenced by the feed frequency, it was not observed significant statistical difference (P>0.01) of erythrocytes, hemoglobin and hematocrit among dietary treatments. For common carp fingerlings, the provision of ration four times daily provided better final weight, final length, weight gain and specific growth rate without causing changes in the composition and hematological parameters of the fish.

Desempenho de alevinos de quatro linhagens da tilápia do Nilo (Oreochromis niloticus) e análise da variabilidade genética pelos marcadores RAPD

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Silagem ácida de resíduos da filetagem de tilápias em dietas de alevinos de piauçu Leporinus macrocephalus

Pós-graduação em Aquicultura - FCAV

Suplementação de lisina e metionina em dietas práticas com baixo nível protéico para o crescimento inicial de alevinos do pacu (Piaractus mesopotamicus (Holmberg, 1887)

Pós-graduação em Aquicultura - FCAV

Valor nutritivo do farelo de pinhão manso (Jatropha curcas) para alevinos de tilápia do Nilo (Oreochromis niloticus)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fósforo disponível na mineralização óssea de alevinos da Tilápia do Nilo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Digestibilidade aparente de ingredientes por alevinos de tilápia do nilo (Oreochromis Niloticus)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Levedura como pronutriente em dietas de matrizes e alevinos de Tílápia-do-Nilo

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Fotoperíodo sobre parâmetros fisiológicos relacionados ao estresse em alevinos de tilápia-do-nilo

Com este trabalho objetivou-se avaliar a influência de diferentes fotoperíodos sobre parâmetros fisiológicos relacionados ao estresse em alevinos de tilápia-do-nilo (Oreochromis niloticus). Foi utilizado um delineamento inteiramente casualizado, com cinco tratamentos (0L; 6L; 12L; 18L; 24L) e quatro repetições, sendo o aquário a unidade experimental. Cento e sessenta alevinos de tilápia, 3,21±0,05g e 4,35±0,07cm, foram distribuídos em 20 aquários de 20 litros, em sistema de recirculação com temperatura controlada em 27oC e densidade de oito peixes por aquário. Por um período de 75 dias, a alimentação foi realizada duas vezes ao dia com ração extrusada contendo 40% de proteína bruta. Ao final do período experimental, os dados de crescimento, sobrevivência, cortisol, glicose e hematócrito foram submetidos à análise de variância e, posteriormente, em caso de significância (P<0,05), foi realizado um teste Tukey a 5% para comparação das médias. A manipulação do fotoperíodo demonstra não alterar a homeostase dos alevinos, uma vez que não há diferença sobre a sobrevivência, glicose sanguínea, hematócrito e cortisol plasmático (P>0,05).

Utilización de espirulina (Spirulina maxima) en la alimentación de alevinos de trucha arco Iris (Oncorhynchus mikyss)

Tesis (Zootecnista). -- Universidad de La Salle. Facultad de Ciencias Agropecuarias. Programa de Zootecnia, 2014

Ocorrência e tratamento de monogenoides em alevinos de pampo (Trachinotus carolinus) cultivados experimentalmente na região norte do estado de São Paulo

This work had as objective tests therapeutic treatments seeking the monogenea eradication in fingerlings Florida Pompano (Trachinotus carolinus) servants in cage net in the area of Ubatuba, State of São Paulo. The fingerlings presented an accentuated weigh loss and strong discoloration and through observation of scraped of gills under light microscope were identified a high amount of monogenea. Three treatments were tested in form of baths: T1 (fresh water for 5 minutes); T2 (formalin: 1: 1.000 for 20 minutes) and T3: (formalin: 1:4.000 for 30 minutes). The treatments were appraised through scraped of gills, mounted among you laminate and laminulas and observed to the light microscope. It was observed that in the tested conditions all of the treatments were efficient in the elimination of the monogenea without presenting lethality to the fish. The treatment is recommended T I (take a bath in fresh water for 5 minutes) for the facility in the application and for the absence of use of chemical products.

PRODUÇÃO de alevinos para aquicultura familiar: programa 24: Nordeste/Vale do Jequitinhonha.

Você vai conhecer as ações da Codevasf, que buscam apoiar a piscicultura e a aquicultura familiar. O Centro Integrado de Recursos Pesqueiros e Aquicultura de Betume, em Neópolis, Estado de Sergipe, é mantido pela Codevasf. Ele produz, anualmente, cerca de 4 milhões de alevinos de espécies nativas do rio São Francisco, como o curimatã (ou xira). Grande parte dessa produção é destinada a produtores familiares, o que contribui para a economia da região do Baixo São Francisco sergipano.