Abstract
Osmoregulation in Litopenaeus vannamei was studied in a factorial experiment at four temperatures (20, 24, 28 and 32 degrees C) and six salinities (10, 16, 22, 28, 34 and 40 per thousand). The isosmotic related points for 20, 24, 28, and 32 degrees C were 754, 711, 822, and 763 mmol/kg, respectively. This species hyperregulates between at salinities of 10 and 20 per thousand and hyporegulates between 20 and 40 per thousand. The isosmotic point in L. vannamei exposed to constant salinities changed in relation to temperature from 717 to 823 mmol/kg. For these experimental conditions, the T-S combination of 32 degrees C and 28 per thousand produced the best growth.
Highlights
Litopenaeus vannamei is the most important commercially farmed shrimp species in the western hemisphere
During the seven days when L. vannamei individuals were exposed to different temperature-salinity combinations; the temperature, salinity and dissolved oxygen were stable (Table 1)
Chen et al (1995) studied the survival, growth and osmolality of the haemolymph and the water content in the tissues of Fenneropenaeus chinensis juveniles, concluding that the osmolality of the haemolymph increased with an increase in salinity, and decreased with an increase in temperature
Summary
Litopenaeus vannamei is the most important commercially farmed shrimp species in the western hemisphere. This research evaluated the osmoregulatory responses in L. vannamei exposed to different temperatures and salinities to find the isosmotic point that reflects the condition for optimum growth in controlled conditions. The haemolymph osmotic pressure (OP) of each of the specimens was measured at the end of the acclimation period for the different salinity/temperature combinations.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
