Occurrence of embryonized nauplius and protozooea stages in southern rough shrimp, Trachypenaeus curvirostris
1994
Ronquillo, J.D. | Saisho, T. (Philippines Univ. in the Visayas, Leganes, Iloilo (Philippines). Coll. of Fisheries)
Spawned eggs of Trachypenaeus curvirostris were examined under laboratory conditions. This study examined the early life history and compared the embryonic development of this species to that of other congeners. The breeders spawned between 21:00-00:00 h. Fecundities ranged between 6,400 to 106,700 eggs. The derived correlation equation between fecundity (Y) and carapace length (X) of breeders was Y + log (-352.215 + 18.656X) (R=0.94, P less than 0.05). Egg size ranged from 223 micro m at spawning to 400 micro m just before hatching. After 15 h and 13 min at 26.0 + 0.20 deg C and 32.5 ppt, 56.4 percent of the eggs hatched as first nauplius larvae covered with amnion-like sac. However, 19.9 percent of the nauplii remained embryonized and 10.3 percent hatched when they reached first protozoe stage after 60 h and 13 min. This is the first time that embryonized nauplius and protozoa stages have been reported in the ontogeny of genus Trachypenaeus
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