TY - JOUR
T1 - Replacement of fishmeal with processed meal from knife fish (Chitala ornata) in diets of juvenile Nile tilapia (Oreochromis niloticus)
AU - Abarra, Sherilyn
AU - Ragaza, Janice
AU - Velasquez, Stephanie
AU - Guzman, Kristina Daniela
AU - Felipe, Jaime Lorenzo
AU - Tayamen, Melchor
PY - 2017/1/21
Y1 - 2017/1/21
N2 - A 60-day feeding trial was conducted to assess the effects of processed meal from knife fish Chitala ornata (KFM) as fishmeal replacement in diets of Nile tilapia Oreochromis niloticus juveniles. Five iso-nitrogenous (36.4% in dry matter) and isolipidic diets (8.6% in dry matter) with 0 (D1), 25 (D2), 50 (D3), 75 (D4) and 100% (D5) KFM inclusions were prepared. With a stocking density of 15 fish (0.59 ± 0.01 g) per tank, tilapia juveniles were distributed randomly in fifteen 30-L tanks. Results indicate a significant increase (P < 0.05) in the percent average weight gain, specific growth rate, and feed intake with increasing KFM inclusion up to the level of 75%. There were no adverse effects observed in both blood profile and carcass composition of the tilapia. Hepatosomatic index of fish significantly increased (P < 0.05) when KFM was included into the diet of tilapia, compared to those fed D1. Viscerosomatic indices were not significantly different (P > 0.05) among treatments. Results of hepatic histopathology showed absence of tumors, lesions and parenchymal inflammation in all treatments. However, mild cell membrane lysis and mild and mild to moderate apoptosis were evident in liver samples. Based on the results, KFM can partially and completely replace dietary protein from fishmeal. Moreover, D4 (75% KFM) is considered the optimal KFM replacement level for Nile tilapia juveniles.
AB - A 60-day feeding trial was conducted to assess the effects of processed meal from knife fish Chitala ornata (KFM) as fishmeal replacement in diets of Nile tilapia Oreochromis niloticus juveniles. Five iso-nitrogenous (36.4% in dry matter) and isolipidic diets (8.6% in dry matter) with 0 (D1), 25 (D2), 50 (D3), 75 (D4) and 100% (D5) KFM inclusions were prepared. With a stocking density of 15 fish (0.59 ± 0.01 g) per tank, tilapia juveniles were distributed randomly in fifteen 30-L tanks. Results indicate a significant increase (P < 0.05) in the percent average weight gain, specific growth rate, and feed intake with increasing KFM inclusion up to the level of 75%. There were no adverse effects observed in both blood profile and carcass composition of the tilapia. Hepatosomatic index of fish significantly increased (P < 0.05) when KFM was included into the diet of tilapia, compared to those fed D1. Viscerosomatic indices were not significantly different (P > 0.05) among treatments. Results of hepatic histopathology showed absence of tumors, lesions and parenchymal inflammation in all treatments. However, mild cell membrane lysis and mild and mild to moderate apoptosis were evident in liver samples. Based on the results, KFM can partially and completely replace dietary protein from fishmeal. Moreover, D4 (75% KFM) is considered the optimal KFM replacement level for Nile tilapia juveniles.
KW - fish meal replacement
KW - Nile tilapia
KW - growth performance
KW - feed utilization
KW - invasive species
KW - knife fish
U2 - 10.1016/j.aqrep.2017.01.001
DO - 10.1016/j.aqrep.2017.01.001
M3 - Article
SN - 2352-5134
VL - 5
SP - 76
EP - 83
JO - Aquaculture Reports
JF - Aquaculture Reports
ER -
