Assessing the optimum temperature for survival, growth and reproduction of adult Caspian Sea Pontogammarus maeoticus

Abstract

This study was conducted to assess the effect of different levels of temperature on survival, growth and reproduction of adult Caspian Sea Pontogammarus rnaeoticus. Temperature effects were studied in 5 thermal levels (15, 20, 25, 30 and 35°C) where salinity was constant (7.1±0.2ppt). The sampling was made from Hassan-nrud coastal area in Guilan province. The results showed that survival was maximum at 20CC (95.56%) with higher temperatures showing a significant descending trend in survival (P<0.05) in which all samples perished on I 8th day at 35°C treatment. The number of produced brood followed a significant ascending , trend from 15°C to 25°C treatments and reached its climax at 25°C (117.3+12.2 broods). The minimum value for produced brood was reported at 15°C treatment (21.3±2.4 broods). A significant persistent increment of growth rate was observed throughout all treatments (P<0.05) where the maximum and minimum values were observed for the final (5.76±0.1mm) and the first.....

Keywords

• growth
• samples
• effect