한국수산과학회

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kfas, vol. 54, no. 5, pp.617-623, October, 2021
DOI. https://doi.org/10.5657/KFAS.2021.0617

Replacement of Dietary Vitamin C with Citrus and Fermented Citrus
By-products in Korean Rockfish Sebastes schlegelii
조피볼락(Sebastes schlegelii) 사료 내 합성 비타민C 대체원으로써의
감귤부산물과 발효 감귤부산물의 첨가 효과

신재형·송진우1·김민기2·임현운·임종호·이경준3*
제주대학교 해양생명과학과, 1제주어류양식수협, 2국립수산과학원 사료연구센터, 3제주대학교 해양과학연구소

The study was conducted to investigate the dietary supplementation of citrus by-product (CBP) and CBP fermented
with Bacillus subtilis (BS) or B. pumilus (BP) on growth performance, feed utilization, innate immune responses
and disease resistance of Korean rockfish Sebastes schlegelii. Triplicate groups of juvenile fish (initial weight of
22.9 g) were fed one of five experimental diets which were formulated to replace a synthetic vitamin C (L-ascorbyl-
2-polyphosphate, LAPP) with CBP or fermented CBP. A basal diet without LAPP and CBP was used as the control
diet (Con). At the end of the 13 weeks feeding trial, growth performance, feed utilization and survival of fish fed the
Con were significantly lower than those of fish fed the LAPP, CBP and fermented CBP diets. Fish fed the Con were
significantly lower in lysozyme activity than fish fed LAPP, CBP and fermented CBP diets. In a challenge test against
Edwardsiella tarda, cumulative mortality of fish fed LAPP, CBP and fermented CBP diets was significantly lower
(20-30%) than that of the Con (60%). The findings in this study indicate that the CBP and/or fermented CBP can be
a promising vitamin C source for LAPP replacement in diet for Korean rockfish.

Keyword : Citrus by-product, Vitamin C, Korean rockfish, Fermentation, Immune response

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