Studies On Cultured Biology And Artificial Propagation Of Parapocryptes Serperaster

1Study on tolerance of environmental factors of Parapocryptes serperasterIn indoor conditions, research has weight for (2.87±0.2g) ofParapocryptes serperaster on red insect of best Celsius temperature, resultsindicates that, Parapocryptes serperaster in26-28℃Shi photo ate maximum,and with temperature of rose or fell, photo ate are gradually reduced, undermore items type intended-in curve that, best feeding temperature for27.6℃;research has96h within weight for (2.87±0.2g) of Parapocryptes serperasteron low temperature of tolerance sexual, results indicates that, Parapocryptesserperaster96h of half died low temperature for10.78℃; research has96hwithin weight for (2.87±0.2g) of Parapocryptes serperaster on high salt oftolerance sexual, results indicates that Parapocryptes serperaster96h of halfdied high salt of for31.94, also determination has weight for (2.87±0.2g) ofParapocryptes serperaster in15℃, and20℃, and25℃, and30℃Shi ofconsumption oxygen rate and asphyxia points, results indicates that,Parapocryptes serperaster of the oxygen consumption increases withtemperature rise, point decrease with increase in temperature.2Feed biology examination of Parapocryptes serperasterUsed red worms, shrimp feed, fish, tropical fish feed, fish feed materials feedingParapocryptes serperaster, and observed selectivity of Parapocryptes serperaster ondifferent diets, feeding frequency and weight increase, and the different size of shrimpfeed feeding result. Experiments showed that:①Parapocryptes serperaster on the choice of feed according to big to small was:red worms> tropical fish feed>shrimp feed>fish feed> fish. It can initially determinedthe preferred feed of the Parapocryptes serperaster is the red worms. ②Parapocryptes serperaster had the largest food intake and the most feed active on19:00, which indicated that Parapocryptes serperaster had the only one feed peak in afeeding day and night. Feeding time was the evening type.③Parapocryptesserperaster gain weight significantly in the case of feeding the red worm. Fish feed,shrimp feed and tropical fish feed on Parapocryptes serperaster weight gain levelalso had a significant effect. This experiment showed that Parapocryptes serperastercast by different diets on normal circumstances, red worms on the pigeon fish growthoutgo other fish feeds.④Parapocryptes serperaster had the largest food intake whencast shrimp feed with the size of20-30orders. Diameter greater than20orders or lessthan30orders of shrimp feed feeding on the Parapocryptes serperaster were causingsome adverse effects.3Studies on reproductive biology and artificial propagation of Parapocryptesserperaster①Identification of male and femaleBody type: female short, coarse, swelling of the abdomen is full, isparticularly obvious during the breeding season; male long and skinny, noswelling of the abdomen.Genital organ opening: her genital organ opening is round, the color red,protrusion; male genital organ opening is triangular shaped, color pink,usually labeled on the body surface, light belly often tilted urination. Whenthe breeding season, female genital organ opening swelling, if maturity isgood, light belly, female from genital organ opening out of the pale yelloweggs, the male fish is out of the white semen.②Sexual distinctionStatistics on252Parapocryptes serperaster tail,134female fish, total53.2%, male118, total46.8%, male and female sex ratio of1.1:1.③Fecundity of Parapocryptes serperasterBy some Parapocryptes serperaster sample count, proper logging in about35-51g individual fecundity of25000-40000tablets, average fecundity of31,089tablets/tail, average relative fecundity is700grain/g. ④Effect of salinity on hatching rateSet salt of processing group0, and3, and6, and9, and12, and18, and24,statistics different salt of Parapocryptes serperaster of hatch rate, resultsindicates that salt of for0o’clock, fertilized eggs embryos almost does notdevelopment, hatch rate for2%; salt of in0-9Shi, hatch rate is rose trend,which salt of at6o’clock, hatch rate highest, reached65%; salt of range in9-24, hatch rate with salt of of rise quickly reduced, dang salt of≥24o’clock,embryos full does not development, hatch rate for0. This shows thatParapocryptes serperaster suitable salinity for the hatching of6-9.4Observation on the embryonic development of Parapocryptes serperasterIn26-28℃water temperature conditions, observation has Parapocryptesserperaster embryos development process, from fertilized eggs to hatch outtouch total experience52h, are divided into following7stages: fertilizedeggs embryodisc formed period, and egg crack period, and blastocysts period,and original intestinal embryo period, and neural embryo period, and organformed period and out film period, total description has from fertilized eggsto hatch out film process of22development periods of timing and formfeatures.