Níveis de proteína digestível para surubim (Pseudoplatystoma sp.) criados em tanque-rede

Abstract

ResumoO surubim (Pseudoplatystoma sp.) é uma das espécie de peixe carnívora que exige atenção especial na dieta ofertada. Este trabalho teve o objetivo determinar a exigência de proteína digestível de juvenis de surubim (Pseudoplatystoma sp.) criados em tanque-rede. O ensaio foi constituído por quatro dietas isoenergéticas (2606,69±39,16 kcal. kg-1 de energia digestível) contendo níveis crescentes de proteína digestível (23, 24, 26 e 28 % PD) fornecidas aos juvenis de surubim (157,35± 11,23g) durante cinco meses. Os parâmetros de crescimentos, composição do filé, enzimas metabólicas hepáticas e morfometria do intestino e fígado foram analisados em delineamento inteiramente casualizado com quatro tratamentos e quatro repetições. O aumento de proteína na dieta proporcionou melhor ganho em peso. As enzimas do metabolismo hepático aumentaram nos peixes alimentados com 24%PD. Não foram observadas alterações histopatológicas no fígado dos peixes. A histologia do intestino revelou adaptação ao aumento de proteína na dieta até o nível de 26% PD. Os juvenis de surubim mostraram-se exigentes em proteína digestível, apresentando os melhores resultados de desempenho de produção e de eficiência de utilização dos nutrientes com a dieta contendo 28% de PD. Palavras-chave: Espécie neotropical, fontes protéicas, nutrição de peixes, peixes carnívoros AbstractThe Pseudoplatystoma sp. is species of carnivorous fish that require special attention in the diet offered. This work had the objective to determine the digestible protein requirement of juvenile the Pseudoplatystoma sp. reared in net cages. The test consisted of four isoenergetic diets (2606.69 ± 39.16 kcal kg-1 of digestible energy) containing increasing levels of digestible protein (23, 24, 26 and 28%PD) provided to juveniles of surubim (157.35±11.23g) for five months. The parameters of growth, fillet composition, metabolic liver enzymes and morphometry of the intestine and liver were

Liver histology and histomorphometry in hybrid sorubim (Pseudoplatystoma reticulatum × Pseudoplatystoma corruscans ) reared on intensive fish farming

“…In hybrid sorubim maintained in a net cage, the hepatosomatic index was affected by the level of digestible protein in the diet, ranging from 1.3% to 1.8% (Honorato et al . ). In the present study, the range of the hepatosomatic index among different categories was expected because of the age difference and metabolic status of the liver; however, the index changed little among individuals of the same category.…”

“…Parenchyma and stroma arrangements were similar to those reported by Honorato et al . () studying sorubim specimens maintained in net‐cages and comparable to native teleosts from Brazil, such as Leporinus macrocephalus (Bombonato et al . ), Astyanax altiparanae (Bertolucci et al .…”

“…In many fish species, the histological and histometric details of hepatic structures are well known (Hinton, Hampton & Lantz ; Rocha, Monteiro & Pereira ). For Brazilian fish, the studies have been limited to qualitative morphological description (Vicentini, Franceschini‐Vicentini, Bombonato, Bertolucci, Lima & Santos ; Bombonato, Rochel, Vicentini & Vicentini ; Costa, Ortis, Lima, Casals, Lima & Kfoury ) although some have investigated the histometric measurements and the effects of nutritional supplements, food additives and pollutants on the hepatic histology (Padua, Urbinati, Nakaghi, Carneiro & Malheiros ; Honorato, Ushizima, Quintana, Campos, Marcondes, Nascimento & Santamaria ; Pereira, Alves, Alves, Senhorini, Rocha, Scalize, Pitol & Caetano ).…”

Quality attributes and properties of surubim (Pseudoplatystoma spp.) meat

“…Fish farming in ponds is one of the oldest methods in aquaculture, mainly used in extensive and semiintensive production systems and, according to Honorato et al (2014), is an excellent alternative for the rational use of water bodies that present difficulties for practicing conventional fish farming. This allows the use of plankton production (SCORVO FILHO et al, 2004), which could improve feed conversion in several fish species (which have gill rakers) and influence oxygen production, interfering with the dynamics of water parameters.…”

Crude protein requirements in feeding for hybrid jundiara (Pseudoplatystoma fasciatum x Leiarius marmoratus)

“…These values, as found in this study, are within the range that Bicudo et al (2012) classified as efficient. The hepatosomatic index (HSI) can be influenced by two factors: diets rich in non-nitrogenous extracts, as its favor the accumulation of glycogen in the liver (Moro et al, 2010), or by diets with high protein levels that may increase liver size and weight as a result of metabolic overload due to protein degradation for energy purposes (Honorato et al, 2014).…”