Article
Dietary Lipid Requirements for Optimal Egg Quality of Redclaw Crayfish, Cherax quadricarinatus
Autor
Rodríguez-González, Hervey
Villarreal, Humberto
Garc´ıa-Ulloa, Manuel
Hern´andez-Llamas, Alfredo
Institución
Resumen
The effect of three crude dietary lipid levels (4, 8, and 12%) on egg quality of the female redclaw crayfish, Cherax quadricarinatus, was evaluated. Three replicate groups of 40
crayfish (mean initial weight ± SD, 23.0 ± 3.0 g) per diet treatment were stocked in 15,000 -L tanks, at 28 C. After 75 d of culture, there were significant differences (P <0.001) in egg area (3.52–3.90 mm2), volume (34.0–39.3 mm3), weight (4.81–5.36 mg), and diameter (2.15–2.27 mm) in response to dietary lipids in the diet. Using the quadratic equation, the maximum responses of these parameters corresponded to lipid levels from 8.60–8.84%. There were no significant differences (P >0.05) in survival (82.1–86.9%), final weight (41.0–43.7 g), number of spawning females (18.12–27.38%), and fecundity (9.07–10.31 eggs/g female). Additionally, there were no significant differences (P >0.05) in egg mean protein (2306.87 ± 440.08 μg/egg), lipid (441.95 ± 83.23 μg/egg) and carbohydrate (74.81 ± 10.12 μg/egg) contents, and energy (13.49 ± 2.25 kcal/egg). The optimum overall response was obtained for dietary lipid content of 8.7%, which we recommend to optimize egg quality of this freshwater crayfish.