Reproductive Characteristics and Early Development of Oratosquilla oratoria

doi:10.11924/j.issn.1000-6850.casb17100115

Abstract

Abstract: To study the reproductive biology characteristics of (Oratosquilla oratoria ) and guide its artificial breeding, the reproductive characteristics and early development ofOratosquilla oratoria from Yangtze River estuary are studied by the conventional biological method and statistics regression analysis. The results showed that the individual absolute fecundity (F ) of 50 matureOratosquilla oratoria ranged from 10480 to 39600 eggs.The individual relative fecundity per centimeter (FL ) ranged from 838 to 2676 eggs/cm and the individual relative fecundity per gram (FW ) ranged from 487 to 1250 eggs/cm. Gonadosomatic Indexes (GSI ) for females were 6.08%-15.63%. Correlation analysis showed thatF ,FL andFW had significantly positive correlations with body length and body weight. The early development study of juvenileOratosquilla oratoria showed that under the conditions of (22.5 ± 0.6)℃ and 30‰-32‰ salinity, the embryonic development lasted for 19 days to hatch out of the membrane and the yolk were fully absorbed in 4 days later. Pseudozoea larvae began at Z1 stage, which lasted 35-40 days and then metamorphosed to theⅠperiod of infant squilla. The results show that we should feed the juvenile Oratosquilla oratoria with rotifers, Artemia nauplius etc. in time after the yolk disappeared completely to meet their growth and development needs.

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