Determinación de la supervivencia de larvas de Jaiba Callinectes toxotes, a diferentes niveles de salinidades en laboratorio, a partir de hembras ovigeras

Abstract

The following research consisted in the determination of the crabs’ larval survival of C. toxotes, to different levels of salinity in the laboratories of aquaculture’s career, in Sucre, Manabí province. This research had 25 spawns of C. toxotes, beginning from ovigerous female of between 14 and 17 cm of ampleness, captured in front of Corazón Island of río Chone estuary, between February and July of 2008. The time of duration development based in the coloration change of the egg masses was of 8 to 11 days in 9 crabs was about 10 to 11 days, with an average of 9,08 ± 0,35 days, producing between 1’ 022582 to 2’874182 larvae/female with an average of 1’666.232, 46 ± 173.276, 26 to a temperature of 27oC. We described five larval stages of pre–zoeal, zoeal 1, 2 ,3 ,4 and the development of larval duration was of 7 days, these were sowed in 30 retorts in the 3 levels of saltwater. We obtained an average survival of 3, 66 ± 2, 49 % since pre–zoeal to zoeal IV in salinity of 20 ups with an average of temperature of 27, 41 ± 0, 55 oC in the salinity of 25 ups we obtained an average survival of 10, 66 ± 8, 71% since pre–zoeal to zoeal III with an average of temperature of 27, 57 ± 0, 49oC and an average survival of 5,35 ± 11,38% since pre–zoeal to zoeal III in the salinity of 30 ups with an average of temperature of 27, 24 ± 0,55oC.