Research On The Reproduction And Biochemistry-ecology Of Platyrhina Sinensis In Minnan Marine Water

Platyrhina sinensis is a minitype fish that lives on the sea bottom of China, southwest of Korea, south of central Japan. Here, the age and the reproductive characteristics of P. sinensis are studied with common biological method, microstructure and ultrastructure method; Measure the percentages of water and oil that contained in the muscle, cartilager, liver, yolk-sac and embryo of P. sinensis with common biochemical technique; Measure the fatty acid that contained in the muscle, liver, eggs, yolk-sac and embryo of P. sinensis with gas chromatography. And research on the biochemical ecology of P. sinensis depends on the environment of fishing grounds (Minnan marine water), the age composition, the reproduction and the biochemical composition of P. sinensis. The following results are finally gained:1. P. sinensis is not considered to be an isometry growing fish. Most annuli of spinal cord are single band, some are double bands, but multi-bands are quite scarce. Annuli are usually forming from January to March. And March is the peak time of population annuli forming. The age composition of the population is from 1-7GR, and their average age is 3.63. The percentage of group 3GRs is 40.34%, it is more than 4GRs (25.21%) and 5GRs (5.04%).2. The R (Centrum radius) vs. TL(total body length ) regression equations is: Female: TL = 107.08R + 178.79(r=0.9023) Male: TL = 101.93R + 203.01(r=0.7228) These two equations well reflect the relationship between total body length and Centrum radius.3. The length-weight relationship is: W=1.0×10-5×L2.8808(r=0.9757), W=2.0×10-5×L2.7635(r=0.9688).These two equations more or less reflect the relationship between body length and the weight of P. sinensis in Minnan marine water. The power exponents of the equation are 2.8808 and 2.7635, so it is not considered to be an isometry growing fish.