Abstract
The effect of water temperature on biochemical composition, growth and reproduction of the ornamental shrimp, Neocaridina heteropoda heteropoda, was investigated to determine the optimum temperature for its culture. The effect of embryo incubation temperature on the subsequent performance of juveniles was also evaluated. Ovigerous females and recently hatched juveniles (JI) were maintained during egg incubation and for a 90-day period, respectively, at three temperatures (24, 28 and 32°C). Incubation period increased with decreasing water temperature, but the number and size of JI were similar among treatments. At day 30 of the 90-day period, body weight and growth increment (GI) at 24°C were lower than those at 28 and 32°C. On subsequent days, GI at 24°C exceeded that at 28 and 32°C, leading to a similar body weight among treatments. These results suggest growth was delayed at 24°C, but only for 30 days after hatching. The lipid concentration tended to be lowest, intermediate and highest at 28, 32 and 24°C, respectively, possibly as a consequence of the metabolic processes involved in growth and ovarian maturation. Protein and glycogen concentrations were similar among treatments. Both the growth trajectory and biochemical composition of shrimps were affected by the temperature experienced during the 90-day growth period independently of the embryo incubation temperature. During the growth period, shrimps reached sexual maturity and mated, with the highest proportion of ovigerous females occurring at 28°C. All the females that matured and mated at 32°C lost their eggs, indicating a potentially stressful effect of high temperature on ovarian maturation. Based on high survival and good growth performance of shrimps at the three temperatures tested over the 90-day period it is concluded that N. heteropoda heteropoda is tolerant to a wide range of water temperatures, with 28°C being the optimum temperature for its culture.
Highlights
Water temperature is one of the most important physical factors affecting survival and growth of decapod crustaceans [1]
Even though egg survival was not measured, we can infer that it was not affected by temperature, given that (1) eggs were laid by all females at the same water temperature (27 ± 1°C), (2) females were randomly assigned to each treatment, and (3) the number of juveniles that hatched per female was similar among temperatures
Present results show that N. heteropoda heteropoda has high tolerance to a wide range of water temperatures (24–32°C), as evidenced by its high survival and good growth performance over a 90-day period
Summary
Water temperature is one of the most important physical factors affecting survival and growth of decapod crustaceans [1]. Growth rate has been shown to increase with increasing temperature to a maximum, before declining near the upper thermal limit of tolerance [1]. By manipulating this parameter, it may be possible to reduce the time needed to culture economically important species. To our knowledge no study has ever been performed to address the possible influence of water temperature on the biochemical composition of freshwater shrimps
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