Appropriate Postlarval Age and Stocking Densities of Litopenaeus vannamei Boone for Rearing in Low Salinity Water

Authors

  • Kaewta Limhang Department of Fishery Biology, Faculty of Fisheries, Kasetsart University, Bangkok 10900, Thailand.
  • Chalor Limsuwan Department of Fishery Biology, Faculty of Fisheries, Kasetsart University, Bangkok 10900, Thailand.
  • Niti Chuchird Department of Fishery Biology, Faculty of Fisheries, Kasetsart University, Bangkok 10900, Thailand.
  • Wara Taparhudee Department of Fishery Biology, Faculty of Fisheries, Kasetsart University, Bangkok 10900, Thailand.

Keywords:

Litopenaeus vannamei, low salinity water, ion concentrations

Abstract

The objective of this study was to evaluate under laboratory conditions the survival and growth rate of postlarvae (PL, where PLx represents the age at day x) at the stages of PL8 and PL10 of Litopenaeus vannamei during 62 d of rearing in water with low salinity levels of 1 and 3 parts per thousand (ppt) with three different stocking densities. The experiment consisted of 12 treatments with three replicate tanks per treatment: treatment 1 (1 ppt, PL8, 60 PL/m2); treatment 2 (1 ppt, PL8, 90 PL/m2); treatment 3 (1 ppt, PL8, 120 PL/m2); treatment 4 (1 ppt, PL10, 60 PL/m2); treatment 5 (1 ppt, PL10, 90 PL/m2); treatment 6 (1 ppt, PL10, 120 PL/m2); treatment 7 (3 ppt, PL8, 60 PL/m2); treatment 8 (3 ppt, PL8, 90 PL/m2); treatment 9 (3 ppt, PL8, 120 PL/m2); treatment 10 (3 ppt, PL10, 60 PL/m2); treatment 11 (3 ppt, PL10, 90 PL/m2); and treatment 12 (3 ppt, PL10, 120 PL/m2). Each 500-L fiberglass tank was equipped with adequate air diffusion and a submersible heater to maintain the temperature at 29+1oC. Shrimp were fed a commercial feed four times daily. Water samples were analyzed for concentrations of Ca2+, Mg2+, Na+, K+ , Cl- and SO4 2- ions every 10 d. After 62 d, shrimp were harvested. There were significant (P<0.05) differences in survival rates of shrimp between postlarvae reared in water with a salinity of 1 ppt and 3 ppt. The survival and growth rates of treatments 7-12 (PL8 and PL10, 60-120 PL/m2) reared in a salinity of 3 ppt were 80.9%, and 0.034 g/d, respectively. However, there were significant (P>0.05) differences in the survival rate and final weights of shrimp with either PL8 or PL10 at the same stocking rate and reared in water with a salinity level of 1 or 3 ppt. The concentrations of six major ions (Mg2+, Ca2+, Na+, K+, Cl- and SO42-) in water with a salinity level of 3 ppt (treatments 7-12) were significantly (P<0.05) higher than those in water with a salinity level of 1 ppt (treatments 1-6) throughout the experiment. The results of the present study indicated that in order to achieve good survival and growth of L. vannamei, PL8-PL10 should be stocked with a density of not more than 60 PL/m2 at 1 ppt or at a stocking rate between 60 and 90 PL/m2 at 3 ppt.

Downloads

Published

2010-10-30

How to Cite

Kaewta Limhang, Chalor Limsuwan, Niti Chuchird, and Wara Taparhudee. 2010. “Appropriate Postlarval Age and Stocking Densities of Litopenaeus Vannamei Boone for Rearing in Low Salinity Water”. Agriculture and Natural Resources 44 (5). Bangkok, Thailand:859-69. https://li01.tci-thaijo.org/index.php/anres/article/view/244999.

Issue

Vol. 44 No. 5 (2010): September-October

Section

Research Article

License

online 2452-316X print 2468-1458/Copyright © 2022. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/),
production and hosting by Kasetsart University of Research and Development Institute on behalf of Kasetsart University.