企鹅珍珠贝(Pteria penguin)在海南黎安港的生长特征

Growth of cultured winged pearl oyster, Pteria penguin was studied in 20 months in Li'an Lagoon, Hainan, south China. The growth parameters of maximum diagonal length (MDL), shell length (MDL), hinge length (HL) and total weight (TW) were measured monthly and described using y=y(subscript ∞)/(superscript (1+e-k(t-a)+d sin (2п/365.25)(t-b))). The results reveal that among the three length parameters, MDL had the largest growth, with the theoretical maximum (y(subscript ∞)) of 112mm;the increase of HL was faster than that of SH at the beginning, but the difference disappeared in the end and the two had almost the same y(subscript ∞) at approximately 85mm;the growth of TW remained almost stagnant in the first half of experiment period, but speed up in the second half, with y(subscript ∞) at 115g. The growth of P. penguin was characterized by fast initial increment of shell size, subsequent to which the total weight increased. It was revealed that the fast growth season of oysters corresponded with the rain season in the study area, which implies that the rainfall probably led to the seasonal variation in growth.