Open AccessARTIFICIAL REPRODUCTION OF Penaeus japonicus BATE AS A BASIS FOR THE MASS PRODUCTION OF EGGS AND LARVAE 1
Author(s) -
Lumare Febo
Publication year - 1981
Publication title -
journal of the world mariculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0735-0147
DOI - 10.1111/j.1749-7345.1981.tb00306.x
Subject(s) - biology , spermatophore , hatching , zoology , penaeus , fishery , shrimp , artificial insemination , population , larva , insemination , sperm , ecology , botany , pregnancy , genetics , demography , sociology
Penaeus japonicus Bate is absent on the Italian coasts, but it is considered a very promising species for national aquaculture. To develop the shrimp‐culture on a commercial basis, a convenient method for producing eggs and larvae of Penaeus japonicus was studied. A stock of 156 females, age class 1+ and F 3 , underwent unilateral eyestalk ablation and they were stocked with males in three plastic tanks (bottom area 14 m 2 ) at a density of 25 individuals/m 2 and a sex ratio of 1:1. Conditions of environment and management consisted of: temperature 21±3°C; natural light and photoperiod; total exchange of sea water every day; feeding on mussels. A month after eyestalk ablation the females were inspected every 7–10 days; mature females were transferred to the spawning tanks. Females with well developed gonads averaged 25.0% of the population of females at every inspection; 51.3% of spawners were impregnated with spermatophores; others were inseminated artificially by the method of introducing spermatophores into the thelycum. In six inspections (carried out during a period of 89 days), 3,028,525 eggs were released; a female released 17,500 eggs on the average (maximum was 123,000 eggs, minimum 4,340). The mean rate of fertilized eggs was 52.7%—67.7% from naturally inseminated females and 7.5% from the artificially inseminated ones. The mean hatching rate was 30.9%—40.1% from natural insemination and 3.3% from artificial insemination. Total amount of viable nauplii was 820,550.