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- Title
Effects of dry pellets containing astaxanthin and squid meal on the spawning performance of striped jack Pseudocaranx dentex.
- Authors
Vassallo-Agius, Robert; Watanabe, Takeshi; Imaizumi, Hitoshi; Yamazaki, Tetsuo; Satoh, Shuichi; Kiron, Viswanath
- Abstract
ABSTRACT: This study was conducted to investigate the effect of squid meal and astaxanthin in dry pellets on the spawning performance of striped jack. Two groups of 8-year-old fish with an average bodyweight of 3.5 ± 0.4 kg were used. The control group was fed a raw fish mix (RF) and the experimental group was fed steam dry pellets (as-DP) containing 10 p.p.m. astaxanthin and squid meal, the latter replacing half the fish meal. Each group was fed once a day, three times a week in floating net cages for a period of 5 months. Seven females and seven males were selected from each group and transferred to 65 m3 indoor concrete tanks for spawning, where they were kept at optimum spawning conditions (22°C) for 1 month. The average bodyweights of selected fish were 3.8 ± 0.5 kg and 3.8 ± 0.6 kg for the RF and as-DP groups, respectively. Both groups spawned a total of 18 times and the mean total egg production and egg quality, measured in terms of buoyancy, fertilization and hatching rates, showed no significant differences (P > 0.05) between groups. Total larval production was 679.9 × 103 and 678.1 × 103 larvae/kg-female for the RF and as-DP groups, respectively. These results show that the combination of astaxanthin and squid meal in dry pellets for striped jack broodstock improved the overall spawning performance to a level similar to that of fish fed on RF.
- Subjects
DENTEX; FISH feeds; FISH spawning; NUTRITION
- Publication
Fisheries Science, 2001, Vol 67, Issue 4, p667
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1046/j.1444-2906.2001.00304.x