Reproductive Behavior, Eggs and Larvae of a Caesionine Fish, Pterocaesio digramma, Observed in an Aquarium.
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Reproductive behavior and early life history of <I>Pterocaesio digramma</I> were described from aquarium observations. Spawning occurred between a pair plus sneakers (usually about 5 individuals) during the period before sunset from the beginning of May to the beginning of July, 1993. Six easily distinguishable behavior patterns were involved in the spawning sequence: 1) Up and down swimming; 2) Courtship; 3) Rushing; 4) Pair spawning; 5) Sperm release by sneakers; and 6) Post spawning. The species was considered to be a group spawner. Fertilized eggs were spherical, transparent, buoyant and unpigmented. They averaged 0.84mm in diameter, and contained a single oil globule averaging 0.16mm in diameter. Hatching began 23 hours after fertilization, 70% of the eggs having hatched within the following 2 hours, at 24.0±0.5°C. Immediately after hatching, larvae were 2.06-2.34mm in total length and had a large ellipsoidal yolk. An oil globule with a few melanophores was situated at the anterior margin of the yolk. Larval development of <I>P. digramma</I> was described during the first 15 days after hatching, 15 day-old larvae being characterized by a large head, a relatively elongated and laterally compressed body, conspicuous preopercular spines and serrate spines in the dorsal and pelvic fins (characteristically long second dorsal and pelvic spines). They also possessed several large and clearly defined dendritic melanophores on the membrane between the second and third dorsal spines.
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