Growth and Physiological Response of Litopenaeus stylirostris Acclimated to Low Salinity

Martin Perez-Velazquez, Mayra L. González-Félix*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Juveniles of wild Pacific blue shrimp Litopenaeus stylirostris (mean initial weight ± standard deviation = 1.5 ± 0.1 g) were acclimated from a natural seawater salinity of 35‰ to salinities of 0, 2.5, 5.0, 7.5, 10, 15, and 25‰. After reaching the desired salinities, L. stylirostris were cultured for 32 d and growth, feed conversion ratio, and survival, as well as hemolymph and culture water osmolality, were determined. The L. stylirostris exposed to 0‰ died before or shortly after reaching the salinity end point. Final mean body weight of L. stylirostris held at 2.5‰ (3.1 ± 0.8 g) was significantly reduced compared with all other treatments. In contrast, those held at salinities from 5‰ to 35‰ had similar performance, with mean body final weight ranging from 3.8 to 4.5 g, showing that L. stylirostris can be cultured across this range of salinities without adversely affecting growth, survival, or feed conversion ratio. Litopenaeus stylirostris is a euryhaline organism, able to maintain its hemolymph osmolality relatively constant despite changes in salinity. The isosmotic salinity of L. stylirostris, estimated from the point of intersection between the regression lines of water salinity versus water osmolality and water salinity versus hemolymph osmolality, was 26.7‰. Litopenaeus stylirostris is an efficient osmoregulator with potential for low-salinity culture.

Original languageEnglish
Pages (from-to)105-111
Number of pages7
JournalNorth American Journal of Aquaculture
Volume84
Issue number1
DOIs
StatePublished - Jan 2022

Bibliographical note

Funding Information:
The authors would like to thank Oscar Acosta-González for his technical assistance during this study at the Kino Bay Experiment Station. The mention of trademarks or proprietary products does not constitute an endorsement of the product by the University of Sonora and does not imply its approval to the exclusion of other products that may also be suitable. There is no conflict of interest declared in this article.

Publisher Copyright:
© 2021 American Fisheries Society

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