EFFECT OF MORPHOMETRIC TRAITS ON INDIVIDUAL FECUNDITY OF THE POUND CULTURED OVER-WINTERING GRAVID MACROBRACHIUM NIPPONENSIS
日本沼虾(Macrobrachium nipponensis)池养越冬抱卵亲虾表型性状对个体繁殖力的影响效应

Effect of phenotypic and morphometric traits on fecundity of the pound cultured over-wintering gravid Macrobrachium nipponensis were studied using correlation analysis, path analysis, and regression analysis. Body weight (BW), net weight (NW), Body length (BL), carapace length (CL), carapace width (CW), carapace height (CH), total length of the abdominal segment (AL), width of the first abdominal segment (AW), height of the first abdominal segment (AH), rostrum length (RL), and telson length (TL) were measured, and the amount of eggs were counted for all individual. Before analyzing, absolute fecundity FJ, relative fecundity FW, and relative fecundity FL were calculated, respectively. The result indicated that: (1) The correlation coefficients among traits were at extremely significant level (P<0.01), and these correla- tion coefficients were significant different from each other. (2) By path analysis, BW, NW, CH, and RL can be regard as the main public variables that were most relevant to the fecundity of the gravid M. nipponensis. The path coefficients between traits and FJ (∑d = 0.810), FL (∑d = 0.621), and FW (∑d = 0.798) were ranged in the following order BW > BL > CH > RL > AL > NW, BW > CL > RL > CH > TL > NW, and BW > CL > CH > RL > NW, respectively. (3) By regression analysis, absolute fecundity FJ, relative fecundity FW, and relative fecundity FL, were calculated as FJ = 5087.802BW - 6599.877NW + 200.927CH + 114.774RL + 211.878BL - 154.965AL - 6266.840, FW = 1140.538BW - 2018.663NW + 85.217CH + 70.852RL + 78.694CL + 74.623TL - 1152.576, and FL = 105.453BW - 134.613NW + 4.307CH + 2.709RL + 3.623CL - 61.737, respectively. (4) Moreover, NW of the gravid shrimp can be well estimated by W(♀) = 0.029BL + 0.065CL + 0.121CW + 0.105CH - 2.448, that was used to estimate the BW of the over-wintering females before mating.