effect of dietary ascorbic
acid levels on reproductive performance of shrimp, litopenaeus vannamei
(boone), broodstock
S. Du, C. Hu, Q. Shen-2004
Journal of Shellfish Research, 23(1): 251-255
Abstract:
This study was conducted to investigate the effect of
dietary ascorbic acid (AA) on reproductive performance of shrimp Litopenaeus
vannamei. Stay
C-35 (a stable derivative, mainly monophosphate) was selected as AA source.
Four grade levels of ascorbic acid equivalent (AAE) (0, 400, 800, and 1200
mg kg -1 diet) were supplemented to the basal diet. Gonadosomatic
index (GSI), hepatosomatic index (HSI), fecundity, and egg diameter were not
significantly affected by supplemented AA levels (P > 0.05), although AA
concentrations in hepatopancreas. ovaries, and eggs increased significantly
with dietary AA levels (P < 0.05). Average daily spawns per female,
hatching rate, and fertilization rate were also significantly affected by
dietary AA levels (P < 0.05). Results of this study confirmed the
importance of supplementation of AA to the basal diet and suggested that at
least 800 mg AAE kg-' diet was needed to supplement to the basal
diet to acquire excellent ovarian maturation and reproductive performance.
(Laboratory of Applied Marine Biology, South China Sea Institute of
Oceanology, The Chinese Academy of Sciences, 510301, Guanghou, People's
Republic of China)