Spawning behavior, eggs, and larvae of the butterflyfish, Chaetodon modestus, in an aquarium

Tanaka, Y.; Hioki, S.; Suzuki, K.

Journal of the School of Marine Science and Technology Tokai University 51: 89-100


Accession: 011382904

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Spawning behavior and early life history of Chaetodon modestus TEMMINCK et SCHLEGEL are described in detail from aqurium observations. The early life history of the present species is the third record among the family Chaetodontidae. Spawning of C. modestus, in captivity, and it occurs between multiple males and one female in the night (between 18:00apprx22:00 hrs.), in almost every day during about eighteen months (from Aug. 14, 1978 to Jan. 31, 1980) at water temperatures of 18.6apprx26.5degreeC. Fertilized eggs are buoyant, spherical, and colorless. They measure 0.75apprx0.80 mm in diameter and contain a single oil globule measuring 0.18apprx0.19 mm in diameter. Hatching takes place 15 hrs. 50 mim. after fertilization at water temperatures of 25.8apprx28.8degreeC. Newly hatched larvae measure 1.40apprx1.50mm in total length, have a large ovoid yolk 0.75apprx0.77mm in long axis, and have 25apprx26 myomere (12apprx13+13=25apprx26). An oil globule is situated at the rear of the yolk. Early larval stages of C. modestus are described for eight days after hatching. The mode of reproduction and the characteristics of developing eggs and larval stages of this species are compared with Chaetodon nippon and C. daedalma both previously studeid.