Frequência alimentar no crescimento de alevinos de peixe-rei Odontesthes humensis

Abstract

ResumoA excelente qualidade da carne, a alta taxa reprodutiva e o amplo espectro alimentar sugerem grande potencial para cultivo do peixe-rei. Estudos relacionados à nutrição e alimentação são fundamentais para viabilizar o cultivo de espécies nativas e proporcionar o rápido e eficiente consumo do alimento e reduzir o desperdício de nutrientes. O objetivo deste trabalho foi avaliar a melhor frequência de suprimento de alimento para o crescimento do peixe-rei Odontesthes humensis. Para tal, 600 alevinos com peso médio de 13 ± 5,9 mg foram distribuídos aleatoriamente em 12 aquários de 50 L. Foram usados quatro tratamentos: ração uma vez/dia, ração três vezes/dia, ração seis vezes/dia e ração oito vezes/dia. Após 32 dias de experimento, foram avaliados: peso médio final, comprimento total, ganho de peso médio, sobrevivência e taxa de crescimento específico. Durante o período experimental a água manteve-se com temperatura de 23 ± 1,0 °C, oxigênio dissolvido de 6,6 ± 0,8 mg.L -1 , pH de 7,5 ± 0,4, a alcalinidade de 45 ± 5 mg.L -1 e a amônia total de 0,1 ± 0,2 mg.L -1 . As variáveis estudadas apresentaram correlação positiva com a frequência alimentar, porém a alimentação 8 vezes/dia resultou no aumento da heterogeneidade dos animais. Desta forma recomenda-se uma frequência de alimentação de 3 vezes/ dia para alevinos de peixe-rei nesta fase de vida. Palavras-chave: Alimento, dieta, peixe nativo, piscicultura AbstractThe excellent quality of pejerrey, high reproductive rate and broad food spectrum suggest great potential for cultivation. Studies related to nutrition and diet are key to facilitate the cultivation of native species and to provide fast and efficient consumption of food and reduce the waste of nutrients. The aim of this work was evaluate the best frequency of food supply Odontesthes humensis growth. For such, 600 fingerlings with average weight of 13 ± 5.9 mg were equal and randomly distributed in twelve 50 L experiment tanks. After 32 days of the experiment were evaluated: average final weight, total length, weight gain, specific growth rate and survival. During the experimental period the water temperature was 23 ± 1.0 °C, oxygen 6.6 ± 0.8 mg.L -1 , pH at 7.5 ± 0.4, alkalinity at 45 ± 5 mg.L -1 and total ammonia 0.1 ± 0.2 mg.L -1 . The results of this study indicated a positive correlation between feed frequency and harvest weight, however 8 times/day feed regime resulted in a increase of fish size heterogeneity. Therefore it is recommended that a feed frequency of 3 times/day for pejerrey at this stage of life.

The effect of photoperiod and feeding frequency on larval of the Amazonian ornamental fishPyrrhulina brevis(Steindachner, 1876)

“…) and can better enable the cultivation of the specie. However, normally, fish in the early stages have a high metabolic rate (Pouey, Rocha, Tavares, Portelinha & Piedras ), small stomach and gut, showing better growth when fed a higher daily rate. Probably, in this study, the amount provided for Artemia larvae twice daily was enough to meet the nutritional requirements of the species.…”

“…This result is relevant for the cultivation of Pyrrhulina, since a reduced number of feeds results in greater savings in manpower, an item that accounts for a large proportion of the fixed production costs (Hayashi et al 2004) and can better enable the cultivation of the specie. However, normally, fish in the early stages have a high metabolic rate (Pouey, Rocha, Tavares, Portelinha & Piedras 2012), small stomach and gut, showing better growth when fed a higher daily rate. Probably, in this study, the amount provided for Artemia larvae twice daily was enough to meet the nutritional requirements of the species.…”

Gene and Blood Analysis Reveal That Transfer from Brackish Water to Freshwater Is More Stressful to the Silverside Odontesthes humensis

“…On the other hand, the congeneric Odontesthes humensis receives little attention from researchers and fish farmers. Only studies involving fry growth ( Pouey et al, 2012 ), embryos salinity tolerance ( Piedras et al, 2009 ), growth in intensive system ( Tavares et al, 2014 ), and toxicology ( Zebral et al, 2017 ) are developed in captivity specimens. Both O. bonariensis and O. humensis species have similar habitats, biological characteristics (including morphology), and are capable of interbreeding.…”

Metabolism and growth performance of pacu (Piaractus mesopotamicus) juveniles submitted to different feeding frequencies

“…Santos et al (2015) reported that the dynamic of endogenous utilization of energy reflects in the use of lipids and products formed through cellular stock, in both absorption and use in metabolic demand. The possible alterations related to increased feeding frequencies suggest that fish use food as a priority in order to meet the energetic demands of body maintenance and reposition of catabolized tissues, which may still be directed to growth (Pouey et al, 2012;Ribeiro et al, 2012;Zhao et al, 2016). In this sense, the somatic index suggests the use of energetic reserves.…”

“…Providing information about productivity and physiology of fish during food restriction can generate relevant information regarding the applicability of food managements in distinct production systems. In this sense, the dietary frequency in fish rearing might influence the levels of protein, cholesterol and triglycerides in plasmatic metabolism (Dieterich et al, 2013), as well as batch uniformity (Pouey et al, 2012), growth (Santos et al, 2014), and body composition with alterations in content moisture, protein, lipid and ash (Daudpota et al, 2016). Productive performance parameters (e.g.…”