Effect of graded levels of dietary seaweed ( Ulva sp.) on growth, hematological and serum biochemical parameters in dusky kob, Argyrosomus japonicus, sciaenidae

摘要

Highlights ? Supplementation with 50?g/kg seaweed did not impair fish growth. ? Supplementation with 200?g/kg seaweed resulted in loss of weight over time. ? Inclusion of Ulva sp. had insignificant effect on haematological parameters and significant effect serum metabolites. Abstract This study was designed to assess the effect of incorporating graded levels of green macroalgae seaweed ( Ulva sp.) into diets of juvenile dusky kob ( Argyrosomus japonicus ) on growth performance, hematology and serum biochemistry. Five experimental diets were formulated to contain 0 (Ulva0), 50 (Ulva50), 100 (Ulva100), 150 (Ulva150) and 200 (Ulva200) g seaweed meal/kg commercial kob feed on a dry matter basis. Seventy-seven dusky kob fingerlings (mean body mass 9.14?±?0.30?g) were distributed into each of 20 experimental tanks and offered diets at 2.8% body mass. Weight and length of fish were measured weekly for 9?weeks. At the end of the feeding trial, fish fed Ulva50 had higher body mass (38.20?±?1.38?g) compared to those fed the other three Ulva -based diets. Fish offered Ulva200 had significantly (P?