REPRODUCTIVE PERFORMANCE AND SPERM QUALITY IN WILD AND POND-REARED SOUTHERN WHITE SHRIMP LITOPENAEUS SCHMITTI ADULT MALES DURING CONTINUOUS REPRODUCTIVE ACTIVITY
2007
Lourdes Pérez Jar | Laida Ramos | Elena Palacios Mechetnov | Ilie Sava Racotta Dimitrov
"Pond-reared populations of southern white shrimp (Litopenaeus schmitti) are commonly used for nauplii production in Cuba, although their performance compared to wild population has not been evaluated. The present study compares reproductive performance and sperm quality of wild and pond-reared L. schmitti males over a production cycle of 70 days. Spermatophore weight was significantly higher for wild shrimp and these differences were not related to body weight or sperm count, suggesting a higher quantity of agglutinating mass. However, sperm quality, percentage of mated females, and number of nauplii per spawn were not different between both populations, whereas fertilization rate was higher for pond-reared shrimp. A decrease in the percentage of normal sperm cells and an increase in dead sperm cells count were observed mainly in wild males, concomitant to a more steep decrease in the fertilization rate and nauplii per spawn towards the end of the production period for this population. An increase in temperature from day 59 and a significant negative correlation between temperature and fertilization was found only for wild males, suggesting a better adaptation of pond-reared males to captive conditions, particularly high temperatures."
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