ABSTRACT This study evaluated the effect of co-feeding with commercial feed and live food (enriched or not with microalgae) on the growth and survival of Trachelyopterus galeatus larvae. Five treatments were carried out: commercial feed as a control (F); brine shrimp nauplii (BS); brine shrimp nauplii enriched with Chaetoceros sp. Microalgae (BSM); combined feed with brine shrimp nauplii (F+BS) and combined feed with brine shrimp nauplii enriched with microalgae (FBSM). The larvae (5.00±0.02 mg and 5.95±0.33mm) were reared for 30 days. There were no significant differences (P>0.05) in water quality between treatments, but there were significant differences in weight, weight gain and survival. The F+BS and F+BSM treatments, which involved co-feeding, showed the best results in final weight (0.168±0.004g and 0.169±0.007g) and weight gain (0.1278±0.004 g and 0.1294±0.007g), respectively. The treatments with live food, enriched or not, showed high survival rates of over 73%, with no significant differences between them. On the other hand, the exclusive use of feed resulted in low survival (36.7 ± 9.53%), indicating that this may result in low growth and make the production of T. galeatus larvae unfeasible. cofeeding co feeding out F (F) BS (BS) sp BSM (BSM) FBS (F+BS FBSM. FBSM . (FBSM) 5.00±0.02 500002 5 00 0 02 (5.00±0.0 5.95±0.33mm 595033mm mm 95 33mm 3 days P>0.05 P005 P 05 (P>0.05 cofeeding, feeding, 0.168±0.004g 01680004g 168 004g 0.169±0.007g 01690007g 169 007g 0.1278±0.004 012780004 1278 004 (0.1278±0.00 0.1294±0.007g, 012940007g 0.1294±0.007g , 1294 0.1294±0.007g) respectively 73 73% them hand 36.7 367 36 7 (36. 9.53%, 953 9.53% 9 53 9.53%) T unfeasible (F (BS (BSM (FBSM 5.00±0.0 50000 (5.00±0. P>0.0 P00 (P>0.0 16 0.1278±0.00 01278000 127 (0.1278±0.0 129 36. (36 9.53 5.00±0. 5000 (5.00±0 P>0. P0 (P>0. 1 0.1278±0.0 0127800 12 (0.1278±0. (3 9.5 5.00±0 500 (5.00± P>0 (P>0 0.1278±0. 012780 (0.1278±0 ( 9. 5.00± 50 (5.00 P> (P> 0.1278±0 01278 (0.1278± 5.00 (5.0 (P 0.1278± 0127 (0.1278 5.0 (5. 0.1278 012 (0.127 5. (5 0.127 01 (0.12 0.12 (0.1 0.1 (0. 0. (0
RESUMO Este estudo avaliou o efeito da coalimentação com ração comercial e alimentos vivos (enriquecidos ou não com microalgas) no crescimento e na sobrevivência das larvas de Trachelyopterus galeatus. Foram realizados cinco tratamentos: ração comercial como controle (F); náuplios de artêmia (BS); náuplios de artêmia enriquecidos com microalga Chaetoceros sp. (BSM); ração combinada com náuplios de artêmia (F+BS) e ração combinada com náuplios de artêmia enriquecidos com microalga (F+BSM). As larvas (5,00±0,02mg e 5,95±0,33mm) foram criadas por 30 dias. Não houve diferenças significativas (P>0,05) na qualidade da água entre os tratamentos, mas houve diferenças significativas no peso, no ganho de peso e na sobrevivência. Os tratamentos F+BS e F+BSM, que envolveram coalimentação, mostraram os melhores resultados em peso final (0,168±0,004g e 0,169±0,007g) e em ganho de peso (0,1278±0,004g e 0,1294±0,007g), respectivamente. Os tratamentos com alimentos vivos, enriquecidos ou não, mostraram altas taxas de sobrevivência acima de 73%, sem diferenças significativas entre eles. Por outro lado, o uso exclusivo de ração resultou em baixa sobrevivência (36,7±9,53%), indicando que isso pode resultar em baixo crescimento e inviabilizar a produção de larvas de T. galeatus. microalgas galeatus F (F) BS (BS) sp BSM (BSM) FBS (F+BS F+BSM. FBSM F+BSM . (F+BSM) 5,00±0,02mg 500002mg mg 5 00 0 02mg 5,95±0,33mm 595033mm mm 95 33mm 3 dias P>0,05 P005 P 05 (P>0,05 0,168±0,004g 01680004g g 168 004g 0,169±0,007g 01690007g 169 007g 0,1278±0,004g 012780004g 1278 0,1294±0,007g, 012940007g 0,1294±0,007g , 1294 0,1294±0,007g) respectivamente 73 73% eles lado 36,7±9,53%, 367953 36,7±9,53% 36 7 9 53 (36,7±9,53%) T (F (BS (BSM (F+BSM P>0,0 P00 (P>0,0 16 127 129 36795 36,7±9,53 (36,7±9,53% P>0, P0 (P>0, 1 12 3679 36,7±9,5 (36,7±9,53 P>0 (P>0 367 36,7±9, (36,7±9,5 P> (P> 36,7±9 (36,7±9, (P 36,7± (36,7±9 36,7 (36,7± 36, (36,7 (36, (36 (3 (