Comparison Between Two Feeding Rates and Three Feeding Frequencies for Hybrid Surubims Reared in Cages

Abstract

This study evaluated the effects of feeding frequency and feeding rate on productive performance of hybrid surubims reared in cages with automatic feeding. Three feeding frequencies (6, 12 and 24 meals day -1 ), and two feeding rates (4% and 8% of body weight per day, BW day -1 ) were evaluated. Hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) with average weights of 24.20 ± 0.80 g were distributed in 18 cages of 1.0 m³ at a density of 60 fish m -3 . Fish were fed commercial ration containing 40% crude protein, and feeding took place at night using automatic feeders. The study lasted 47 days. With a feeding rate of 4% BW day -1 , the final weight (FW) of the surubims was higher when feed was supplied as 24 meals day -1 (66.92 g). However, using 8% BW day -1 , the FW was greater with a feeding frequency of 12 meals day -1 (106.90 g). Regardless of feed frequency, the values of daily weight gain and standard length of surubims were higher with the feeding rate of 8% BW day -1 . Therefore, the feeding rate of 8% BW day -1 , provided in 12 meals day -1 , provided better productive performance for hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) reared in cages. COMPARAÇÃO ENTRE DUAS TAXAS E TRÊS FREQUÊNCIAS ALIMENTARES PARA SURUBINS HÍBRIDOS CRIADOS EM TANQUE REDERESUMO -Este estudo avaliou os efeitos da frequência e taxa de alimentação sobre o desempenho produtivo de surubins híbridos criados em tanque rede. Três frequências (6, 12 e 24 refeições dia -1 ) e duas taxas de alimentação (4% e 8% do peso vivo por dia, PV dia -1 ) foram avaliadas. Híbridos de surubim (Pseudoplatystoma corruscans x Pseudoplatystoma fasciatum), com peso médio de 24,20 ± 0,80 g, foram distribuídos em 18 tanques rede de 1,0 m³ com densidade de 60 peixes m -³. Os peixes foram alimentados no período noturno por alimentadores automáticos, com ração comercial contendo 40% de proteína bruta. O estudo teve duração de 47 dias. Com a frequência de 4% PV dia -1 , o peso final (PF) dos surubins foi maior com o fornecimento da ração em 24 refeições dia -1 (66,92 g). Entretanto, usando 8% PV dia -1 o PF foi maior com a frequência de 12 refeições dia -1 (106,90 g). Independente da frequência alimentar, os valores de ganho de peso diário e comprimento padrão dos surubins foram maiores com a taxa de alimentação de 8% PV dia -1 . Assim, o fornecimento da ração com taxa alimentar de 8% PV dia -1 , dividida em 12 refeições dia -1 , proporcionou melhor desempenho produtivo para surubins híbridos (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) criados em tanque rede.Palavras-chave: Manejo alimentar. Alimentação noturna. Pseudoplatystoma corruscans. Pseudoplatystoma fasciatum.

FREQUí­Å NCIA ALIMENTAR NA CRIAÇÃO DE JUVENIS DE SURUVI <i>Steindachneridion scriptum</i>

“…The suruvi juveniles were highly resilient to the present study's management conditions, with animals' survival rate in all treatments being higher than more than 99.0%. These findings were consistent with those of previous studies for suruvi (Zaniboni-Filho et al, 2008) and other native catfish (Fracalossi et al, 2004;Bittencourt et al, 2018;Bogiani et al, 2018).…”

“…Feeding The present study's feed conversion findings corroborate those of Zaniboni-Filho et al (2008), who submitted suruvi juveniles to different photoperiods and temperatures in a recirculation system and reported that most animals showed conversions between 3.0 and 4.0 until the 60th day. Feed conversion studies on feeding frequency with young forms of other catfish revealed that this zootechnical index might vary among species and fish sizes (Hossain et al, 2001;Carneiro and Mikos, 2005;Aderolu et al, 2010;Fan et al, 2017;Bogiani et al, 2018).…”

“…In carnivorous fish like suruvi, feed transit in the gut is slower, and thus high feeding frequencies within short time intervals can increase feed waste, reduce digestion and nutrient uptake, and consequently lead to low protein and lipid retention (Baldisserotto, 2002;Carneiro and Mikos, 2005;Wang et al, 2009;Bogiani et al, 2018).…”

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

“…Several studies have proven the benefits of adopting high feeding frequencies, such as greater crop uniformity and better feed efficiency, resulting in less environmental impacts on the crops (Bogiani et al, ; Sousa et al, ; Xie, Ai, Mai, Xu, & Ma, ). Even the frequency increase from one to three times a day already provided better results for weight gain and feed conversion (Moreira, Rombenso, Candiotto, & Tsuzuki, ).…”

“…Therefore, the adoption of automatic feeders would solve this problem, along with the advantage of distributing food without human interference. Studies have shown that the continuously providing (diurnal and nocturnal) the feed can favour productive performance (Bogiani, Castro, Kunii, Oliveira, & Agostinho, ; Hossain, Haylor, & Beveridge, ). Automatic feeders can therefore provide better zootechnical results and, consequently, improve the environmental sustainability of the crops by reducing the effluent released, thus, increasing the economic return of marine fish farming (Herrera et al, ).…”