article · Aquaculture Research
Feeding trials evaluated the effects of chemically synthesised astaxanthin on the survival, growth performance, and stress resistance of kuruma shrimp at larval and post-larval stages. Diets were tested with six different inclusion levels ranging from zero to 800 milligrams per kilogram. In an eight-day larval trial, astaxanthin supplementation enhanced performance during development and metamorphosis into postlarvae, with optimal calculated levels of 168.9 milligrams per kilogram for growth and 82.1 milligrams per kilogram for stress resistance. In a subsequent thirty-day post-larval trial, inclusion rates of 100 and 200 milligrams per kilogram delivered significantly higher body weight gain and specific growth rates compared to baseline feeds. Furthermore, postlarvae receiving 200 milligrams per kilogram showed significantly reduced mortality under osmotic stress. Calculated optimal levels for postlarvae were 108.7 milligrams per kilogram for growth and 178.1 milligrams per kilogram for stress tolerance.
Early life stages in shrimp farming present high mortality risks and sensitivity to environmental variations. Pinpointing exact dietary requirements for synthetic astaxanthin helps hatcheries improve survival rates, larval quality, and resilience against physical stress. These findings offer clear nutritional benchmarks that can improve hatchery productivity and reduce losses during vulnerable developmental periods.
This research provides defined dosing benchmarks for commercial aquaculture feed manufacturers formulating specialised diets for shrimp hatcheries and nurseries. The findings represent applied and tested dietary formulations evaluated in controlled feeding trials. Commercial adoption would involve incorporating synthetic astaxanthin at the specified inclusion rates into practical larval and post-larval feed products for commercial kuruma shrimp producers.
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Two trials were conducted to evaluate the effects of chemically synthesized astaxanthin (Ax) on growth performance, survival, and stress resistance in larval and post-larval kuruma shrimp (Marsupenaeus japonicus). Six dietary levels of Ax (0, 50, 100, 200, 400 and 800 mg/kg diet) were added to a baseline diet. As a first study, an 8-day feeding trial was conducted on larval kuruma shrimp, with results showing that larvae-fed diets supplemented with different Ax levels exhibited better performance during developmental and metamorphosis to postlarvae. Broken-line regression analysis indicated that the optimal levels for growth and stress resistance of larvae were 168.9 mg/kg and 82.1 mg/kg diet, respectively. Second, a 30-day feeding trial was conducted on post-larval shrimp. Supplementation with 100 and 200 mg/kg Ax yielded significantly higher final body weight, body weight gain and specific growth rate than that in a control group. A cumulative mortality index for osmotic stress revealed significantly better performance in a group fed 200 mg/kg supplementation than in controls. Broken-line regression analysis indicated that the optimal levels for growth and stress resistance of postlarvae were 108.7 mg/kg and 178.1 mg/kg diet, respectively. Based on these results, we suggest that carefully dosed Ax supplementation is a beneficial nutritional strategy for the early developmental stages of kuruma shrimp.
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DOI: 10.1111/are.13679
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