Fish Meal Replacement by Chicken By-Product Meal in Diet: Impacts on Growth and Feed Availability of Juvenile Rockfish (<i>Sebastes schlegeli</i>), and Economical Analysis
A 56-day feeding experiment was carried out to evaluate the effects of substituting fish meal (FM) with chicken by-product meal (CBM) in diets on the growth and feed utilization of rockfish (<i>Sebastes schlegeli</i>). Six experimental diets were formulated to be isonitrogenous and isoli...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
|
| Series: | Animals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-2615/15/1/80 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | A 56-day feeding experiment was carried out to evaluate the effects of substituting fish meal (FM) with chicken by-product meal (CBM) in diets on the growth and feed utilization of rockfish (<i>Sebastes schlegeli</i>). Six experimental diets were formulated to be isonitrogenous and isolipidic. The control (Con) diet included 55% FM. In the Con diet, 10%, 20%, 30%, 40%, and 50% of FM was replaced with CBM, named as the CBM<sub>10</sub>, CBM<sub>20</sub>, CBM<sub>30</sub>, CBM<sub>40</sub>, and CBM<sub>50</sub> diets, respectively. A total of 540 juvenile fish were distributed into 18 tanks (30 fish per tank and 3 tanks per diet) and fed to apparent satiation two times daily for 56 days. The weight gain and specific growth rate of rockfish fed the CBM<sub>10</sub> and CBM<sub>20</sub> diets were comparable to rockfish fed the Con diet. The feed consumption of rockfish fed the Con and CBM<sub>10</sub> diets was significantly (<i>p <</i> 0.001) higher than that of fish fed all other diets, except for the CBM<sub>20</sub> diet. However, protein retention, biometric indices, chemical composition, amino acid profiles, and plasma and serum parameters of rockfish were not significantly influenced by dietary FM substitution with CBM. The Con, CBM<sub>10</sub>, and CBM<sub>20</sub> diets showed superior (<i>p <</i> 0.001) economic profit index (EPI) compared to the CBM<sub>30</sub>, CBM<sub>40</sub>, and CBM<sub>50</sub> diets. Conclusively, FM up to 20% could be substituted by CBM in diets without impairing growth, feed availability, chemical composition, amino acid profiles, and blood parameters of rockfish grown from 2.5 g to 12.5 g. However, the long-term effects of CBM substitution or the potential use of combined CBM and other alternative protein sources for FM in rockfish diets are needed in future. |
|---|---|
| ISSN: | 2076-2615 |