Title Spawning and Larval Rearing of California Yellowtail (Seriola lalandi) in Southern California
Authers Kevin STUART and Mark DRAWBRIDGE
Keywords Seriola lalandi, aquaculture, green water culture, live feed management
Citation Bull. Fish. Res. Agen. No.35, 15-21, 2012
Hubbs-SeaWorld Research Institute (HSWRI) has been rearing California yellowtail (Seriola lalandi) in San Diego, California, since 2003. The broodstock spawn naturally between 16.5-22.0°C in a 140 m3 maturation pool. Egg quality measurements have shown inconsistent spawn quality, with highest quality seen early in the spawning season. Hatch rates ranged from 10-90% and survival to first feeding at two days post-hatch (dph) ranged from 5 -80%. Recent research results on yellowtail larvae have shown no significant differences in growth or survival at 10 dph among egg stocking densities of 50, 100, and 200 eggs/L. There were no significant differences in growth or survival when larvae were fed at densities of 15, 30, and 45 rotifers/ml. Larvae were able to consume 1st instar brine shrimp (Artemia franciscana) as early as 6 dph. Finally, we determined that greenwater rearing conditions created using either INVE SanoLife(R) ALG, algae paste, or live algae all produced similar results. Current culture protocols for production are based on these results and include 1) stocking eggs at a density of 100/L; 2) maintaining water temperature at 21.0-22.0°C; 3) providing rotifers (Brachionus rotundiformis) from 2 to 9 dph at 20/ml; 4) moving larvae from tall, narrow 1600 L egg incubators to shallow, wide 8,000 L tanks at 10 dph; 5) providing 1st instar A. franciscana from 6-10 dph and 2nd instar A. franciscana from 10-35 dph; 6) 24 hr overhead light at 5,000-13,000 lux; and 7) using Green water from 2-17 dph. These procedures yielded consistent survival rates from egg to juvenile of up to 5%. High larval mortality, from unidentified causes at around 17-20 dph and deformity rates as high as 40% are focal areas for future improvement.
URI http://www.fra.affrc.go.jp/bulletin/bull/bull35/35-3.pdf