Evaluation of fisheries by-catch and by-product meals in diets for red drum (Sciaenops ocellatus)

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Title: Evaluation of fisheries by-catch and by-product meals in diets for red drum (Sciaenops ocellatus)
Author: Whiteman, Kasey
Abstract: By -catch and wastes from processed fish and shrimp constitute a sizeable portion of commercial fishery landings . This discarded material is potentially valuable , for its content of fish meals and other substances . Fish meals , in particular , are increasingly in short supply for the manufacture of animal feeds , including feeds for farmed fish . Therefore , in this study , various by -catch and by -product meals of marine origin were evaluated with red drum (Sciaenops ocellatus ) , a carnivorous fish species native to the Gulf of Mexico that has been cultured over the past two decades for stock enhancement as well as for food . Four different kinds of by -catch or by -product meals [shrimp by -catch meal , shrimp processing waste meal , red salmon (Oncorhynchus nerka ) head meal , and Pacific whiting (Merluccius productus ) meal] were substituted for Special Select ? ? menhaden fish meal at two different levels (33 % or 67 % of crude protein ) in prepared diets for red drum . Another treatment consisted of shrimp processing waste meal formulated on a digestible -protein basis to replace 33 % of the protein from menhaden fish meal . Levels of calcium carbonate were reduced in two additional diets containing Pacific whiting , to evaluate the effects of ash content . Diets were formulated to contain 40 % crude protein , 12 % lipid , and 3 .5 kcal digestible energy /g . Each diet was fed to triplicate groups of juvenile red drum in 38 -l aquaria containing brackish water (7 ? ? 1 ppt ) in two separate 6 -week feeding trials . Survival , weight gain , feed efficiency , protein efficiency ratio and body composition responses were measured in each trial . Fish fed the by -catch meal at either level of substitution performed as well as fish fed the control diet containing protein solely from menhaden fish meal ; whereas , fish fed the shrimp processing waste meal diets did significantly (P & #8804 ; 0 .05 ) worse than the controls , even when fed a diet formulated to be equivalent on a digestible -protein basis . Fish fed the red salmon head meal diet fared poorly , probably owing to an excessive amount of lipid in the diet that tended to become rancid . Overall , by -catch meal associated with shrimp trawling appears to be a very suitable protein feedstuff for red drum .
URI: http : / /hdl .handle .net /1969 .1 /3277
Date: 2006-04-12

Citation

Evaluation of fisheries by-catch and by-product meals in diets for red drum (Sciaenops ocellatus). Available electronically from http : / /hdl .handle .net /1969 .1 /3277 .

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