Long Term Feeding Effects of Dietary Dehulled Soybean Meal as a Fish Meal Replacer in Growing Olive Flounder Paralichthys olivaceus

Young Chul Kim,Sungchul C Bai,Gwang Yeol Yoo,In Soo Shin,Seunghyung Lee,Xiaojie Wang

doi:10.5713/ajas.2008.70496

Abstract

This experiment was conducted to evaluate the long term effects of dehulled soybean meal (DHSM) as fish meal (FM) replacer in the diet for olive flounder, Paralichthys olivaceus, for 42 wk at a commercial fish farm. The four experimental diets were MP (moist pellet based on raw fish), DHSM 0 (fish meal based dry pellet), DHSM 30 (30% fish meal was replaced by DHSM) and COMD (commercial dry pellet). Fish were fed one of the four diets containing 50% crude protein and 16.7 kJ available energy/kg diet for 42 wk. Fish averaging 3.20±0.04 g (mean±SD) were initially distributed to each tank as a group of 6,000 fish reared in a flow-through system. At the end of the experiment, average body weight of fish was 315±9.3 g (mean±SD). Weight gain (WG) and feed efficiency (FE) of fish fed MP, DHSM 0 and DHSM 30 showed no significant difference among the diet treatments. However, WG and FE of fish fed MP were significantly higher than those of fish fed COMD (p<0.05). Specific growth rate (SGR), protein efficiency ratio (PER) and survival of fish fed all diets were not significantly different among the dietary treatments. Therefore, these results indicate that DHSM could replace up to 30% white fish meal with amino acid supplementation in olive flounder diets for long-term feeding practice at the commercial farm.

Highlights

Fish meal (FM) has traditionally been a major ingredient in fish diets because of its high protein quality and palatability, but is one of the most expensive ingredients in formulated fish diets. Lee and Bai (1997) noted that the world supply of FM increased by only about 27% during the past two decades and FM output by the major FM-producing countries declined
Follows: MP; DHSM0 (fish meal (FM) based dry pellet); DHSM30 (30% FM was replaced by dehulled soybean meal); COMD to contain 50% crude protein (CP) and 16.7 kJ available energy/kg diet
White FM, DHSM and corn gluten beginning of the experiment, a group of 6,000 fish meal served as the major protein sources

Summary

Introduction

Fish meal (FM) has traditionally been a major ingredient in fish diets because of its high protein quality and palatability, but is one of the most expensive ingredients in formulated fish diets. Lee and Bai (1997) noted that the world supply of FM increased by only about 27% during the past two decades and FM output by the major FM-producing countries declined. Because of limited supply of FM around the world coupled with the increasing demand, the cost of producing fish is likely to increase. For this reason, many studies have been conducted to replace or reduce FM inclusion in fish diets using less expensive alternative protein sources. Olive flounder is one of the commercially important fish species in Korea. Culture of olive flounder has increased rapidly in the last 20 years in Korea from an annual production of 3 MT in 1981 to 43,724 MT in 2006 (MOMAF, 2006). The production of formulated feeds of olive flounder increased to 116,659 MT in 2006 (MOMAF, 2006)

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Results