Biology of the Bluntnose Stingray, Dasyatis Sayi, in Florida Coastal Lagoons
Dasyatis sayi is a common year-round resident in the brackish Indian River lagoon system on the central east coast of Florida. We studied the species in the Cape Canaveral area from July 1975 to January 1978. Catch-per-unit-effort generally peaked in the spring and fall, was depressed in winter, and usually was significantly higher at night than during the day. Catch rates were always highest in Mosquito Lagoon, the most saline section of the study area. Females reached a size of 73 cm DW and 21 kg; males reached 52 cm and 7 kg. Females matured between 50-54 cm DW and males between 30-36 cm. The reproductive cycle was significantly different from that of the sympatric D. sabina. Ovarian egg size and male gonasomatic index both peaked in May, indicating that mating occurred in spring. Uterine eggs were present from June through the following March but no embryonic development was evident. Fetal development began in early April and parturition occurred in middle to late May, followed immediately by ovulation. There were 1-6 young per brood and neonates were 15-17 cm DW at birth.
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Document Type: Research Article
Publication date: July 1, 1989
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