Research On The Fetation And Further Nutritional Needs Of Cynoglossus Semilaevis Juvenile

This paper consists of two main parts, the first part is about the fetation of Cynoglossus semilaevis and the second part is about the Cynoglossus semilaevis juvenile nutritional needs.1.the fetation of Cynoglossus semilaevis1.1the effect of temperature to the fetation of Cynoglossus semilaevisTemperature group test recorded each hatching time, fish counts, eggs died counts, fish deformities counts, fish vitality. Then calculated the group hatching rate, the rate of deformities, Q10 values. Comparison revealed that each 1℃rise from 18℃to 22℃, hatch time shoten 3~5 hours, from 23℃to 28℃, the hatch time for fewer. Fetation stopped at early blastula period at 17℃,stopped at 8 cells stage at℃14. The temperature is cooler the growth stopped earlyer. Temperature at 2℃9, the embryo growns on to hatch period and hatchs no fish, water temperature above 3℃0, fetation also stopped at blastula period. So we think Cynoglossus semilaevis embryos hatch temperature limit below 17 degrees, above 29 degrees.Water temperature from 18℃to 22℃,4℃contrast,the hatch time shorted 16 hours and 20 minutes.On the temperature, the temperature dramatic impacts on the fetation. Water temperature from 18℃to 22℃,the hatch time shorted 4 hours and 15 minutes. On the temperature of 22℃above the effects of foetal development progress to be alleviated. So we think 22℃is an important influent temperature line of fetation. The highest hatching rate appears at 20~2℃3, and Q10 value is the nearest to 2 in the scope of 22~23℃. We believe that the most appropriate Cynoglossus semilaevis embryo hatch temperature is 22~23 degrees.1.2the effect of salinity to the fetation of Cynoglossus semilaevis...