Feeding rate and frequency on juvenile pompano growth

Abstract

-The objective of this work was to evaluate the ideal feeding rate and frequency for juvenile pompano (Trachinotus marginatus). Two experiments were carried out in a completely randomized design, with three replicates each. In experiment I, 25 fish (4.8±0.6 g and 6.48±0.01 cm) were stocked in 15 tanks (50 L) during 21 days and fed 4, 8, 12, 16, and 20% body weight per day. In experiment II, 20 fish (4.1±0.1 g and 6.6±0.1 cm) were stocked in 15 tanks (40 L) during 28 days and fed 2, 6, 8, and 10 times a day. The tested feeding rates and frequencies did not influence survival. Final weight and length in experiment I were significantly lower in fish fed 4% body weight per day, whereas in experiment II only weight was significantly lower in fish fed 2 and 6 times a day. At the end of both experiments, apparent feed conversion showed significant difference, with the worst value observed for fish fed 20% body weight per day in experiment I and 2 times a day in experiment II. Juvenile pompano show better growth performance when fed 8% body weight per day and 8 times a day.Index terms: Trachinotus marginatus, feed management, marine fish culture. Taxa e frequência alimentar no crescimento de juvenis de pampoResumo -O objetivo deste trabalho foi avaliar a taxa e a frequência alimentar ideal para juvenis de pampo (Trachinotus marginatus). Foram conduzidos dois experimentos, em delineamento inteiramente casualizado, com três repetições cada um. No experimento I, 25 peixes (4,8±0,6 g e 6,48±0,01 cm) foram estocados em 15 tanques (50 L) durante 21 dias e alimentados com 4, 8, 12, 16 e 20% da biomassa total por dia. No experimento II, 20 peixes (4,1±0,1 g e 6,6±0,1 cm) foram estocados em 15 tanques (40 L) durante 28 dias e alimentados 2, 6, 8 e 10 vezes por dia. As taxas e as frequências alimentares testadas não influenciaram a sobrevivência. O peso e o comprimento finais no experimento I foram significativamente menores nos peixes alimentados com 4% da biomassa total por dia, enquanto, no experimento II, somente o peso foi significativamente menor nos peixes alimentados 2 e 6 vezes por dia. Ao final dos dois experimentos, a conversão alimentar aparente apresentou diferença significativa, com pior valor observado nos peixes alimentados com 20% da biomassa total por dia, no experimento I, e 2 vezes por dia no experimento II. Juvenis de pampo apresentam melhor desempenho de crescimento quando alimentados com 8% da biomassa total por dia e oito vezes por dia.Termos para indexação: Trachinotus marginatus, manejo alimentar, piscicultura marinha.

Feeding frequency for dusky grouper Epinephelus marginatus juveniles with automatic feeding system

“…On the other hand, some studies have shown that increased frequency may lead to a reduction in feed conversion. Cunha et al, () evaluated different frequencies (2, 6, 8 and 10 times a day) and obtained a lower feed conversion using higher feeding frequencies. Kasiri et al, () concluded that an increased feeding frequency resulted in greater food consumption and fish growth; however, inversely proportional, higher frequencies caused a poorer food conversion.…”

“…Defining food management should allow for the full manifestation of the species performance, the economic viability of the crop and its environmental sustainability, with a focus on effluent reduction (Cunha, Shei, Okamoto, Rodrigues, & Sampaio, ). Feeding frequency is a component of food management which defines how many times the food will be offered throughout the 24 hours of the day.…”

“…Feeding frequency is a component of food management which defines how many times the food will be offered throughout the 24 hours of the day. The use of an optimum feeding frequency promotes better growth, more homogenous batches (lower coefficient of variation), high survival, lower feed conversion, as well as minimizing the release of effluents and contributing to reduce the environmental impact of crops (Cunha et al, ). On the other hand, inadequate feeding frequencies may delay growth, increase intra‐specific aggressions and cannibalism rates, decrease intestinal enzyme activity and reduce hepatic expression, resulting in significant economic losses and reduction in crop profitability (Booth, Tucker, Allan, & Fielder, ; Tian et al, ).…”

“…The productive performance of marine fish can be positively influenced when feeding frequency is high (Cunha et al, ; De La Gándara, García‐Gómez, & Jover, ). However, in most studies, the frequencies examined are relatively low and range from once a day to eight times a day, with very few studies examining frequencies >12 times a day.…”

Crescimento compensatório e privação alimentar no desempenho produtivo do robalo-flecha

“…A utilização de dietas para peixes marinhos pode ser limitada pela ausência de informações sobre práticas adequadas de manejo alimentar (Ramos et al, 2012, Sanches et al, 2014. A determinação do protocolo alimentar contribui para reduzir o desperdício de ração e o lançamento de efluentes, elevando o retorno econômico dos cultivos (Cunha et al, 2013).…”