Scientia Marina, Vol 62, No 4 (1998)

Egg and early larval development of laboratory reared dusky grouper, Epinephelus marginatus (Lowe, 1834) (Picies, Serranidae)


https://doi.org/10.3989/scimar.1998.62n4373

Branko Glamuzina
Institute of Oceanography and Fisheries, Croatia

Bosko Skaramuca
Institute of Oceanography and Fisheries, Croatia

Niksa Glavic
Institute of Oceanography and Fisheries, Croatia

Valter Kozvul
Institute of Oceanography and Fisheries, Croatia

Jakov Dulcic
Institute of Oceanography and Fisheries, Croatia

Miro Kraljevic
Institute of Oceanography and Fisheries, Croatia

Abstract


The embryonic and early larval development of the laboratory-reared dusky grouper, Epinephelus marginatus (Lowe, 1834) are described and illustrated. The eggs, with a mean diameter of 846.68 ± 41 µm and a range from 736-940 µm, were spherical and transparent with transparent chorion. Embryonic development lasted 30 hours at 23°C. Newly-hatched larvae were 1.52 ± 0.066 mm in length. Absorption of the yolk sac was complete after the fourth day, when larvae reached 2.63 ± 0.123 mm in total length. The mouth opened 72 hours after hatching, and was in function after 96 hours, with an opening diameter ranging from 250-300 µm. Larvae had two fields of intensive pigmentation, one above the intestine, and the other between the anus and the end of the notochord.

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