Abstract

ESCOBAR GIL, Christian; PACHAMORO LEYTON, Marlon  and  REYES AVALOS, Walter. Survival and growth of adult males  of river shrimp Cryphiops caementarius Molina, 1782 (Crustacea, Palaemonidae) exposed to salinities. Ecol. apl. [online]. 2017, vol.16, n.2, pp.75-85. ISSN 1726-2216.  http://dx.doi.org/10.21704/rea.v16i2.1010.

The aim was to evaluate the survival and growth of adult males of the freshwater shrimp Cryphiops caementarius exposed to salinities. The experiment was carried out in 12 aquariums with 50 l of water, each with biological filter and five shelters. The experimental salinities were 0, 2, 4 and 8‰, implemented in triplicate. Five shrimps were stocked at random in each aquarium. A total of 60 adult male shrimps (5.94 ± 0.11 cm of total length and 8.15 ± 0.810 g of wet weight) were used in the experiment that lasted 60 days. Shrimps exposed to water with 4‰ of salinity presented high and significant (p<0.05) survival (>80%), whereas in 0 ‰ and 2 ‰ the survival was low (20%)due to cannibalism, and in 8‰ the survival was very low (6%) due to osmotic stress. Growth of shrimps exposed to 4‰ salinity showed no significant difference (p>0.05) with those exposed to 0‰ and 2‰ of salinity during the study period, but the highest values of growth in weight were presented to 4‰ salinity.

Keywords : osmotic; stress; growth; osmoregulation; survival; Cryphiops.

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