Survival of the shrimp larvae in low salinity

Abstract

The shrimp species that is cultivated with more success as well in Venezuela as in the world it is Litopenaeus vannamei. Shrimp farming in Venezuela is limited to coastal areas, other farms located to the south of Maracaibo Lake use water with low salinities. It is known alone of a culture experience using well water. Major problems for inland shrimp farming have includded high mortality of postlarvae during the acclimation to low salinity. This project arises with the purpose of demonstrating the feasibility of inland shrimp farming, it uses as source of water underground wells. The present study, the survival and growth of Litopenaeus vannamei postlarvae acclimated in low salinity well water from Piscicultura «ACUAFIN», Falcón State were evaluate. The acclimatation experiment were conducted using 5,400 PL-12, postlarvae were transferred in three experimental groups each one with four containers: T1: prepared seawater with rain water; T2: inland well water; T3: inland well water with supplementation potassium. The salinity in each battery of four replicate containers was reduced from 37 ppt (seawater salinity) to 4 ppt (inland well water salinity). Survival was assessed 24 h after finishing acclimation. Survival in T1 (95,6 %) Y T 3 (95 %) was similar. Survival in T 2 was significantly lower (81,5 % ) from The other experiments.two hours. Temperature range was 26,3 and 29,2 °C (¯x= 27,7 °C ± 0,9) and pH range was 7,7 to 8,1 (x¯= 7,9 °C± 0,1).