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Early Osteological Development of the Larvae and Juveniles in Sevenband Grouper, Epinephelus septemfasciatus (Pisces: Serranidae)  

Park, Jong Youn (Aquaculture Management Division, Aquaculture Research Institute, NFRDI)
Hong, Chang Gi (Southwest Sea Fisheries Research Institute, NFRDI)
Cho, Jae Kwon (Aquaculture Management Division, Aquaculture Research Institute, NFRDI)
Son, Maeng Hyun (Southwest Sea Fisheries Research Institute, NFRDI)
Han, Kyeong Ho (Chonnam National University, Department of Aqualife Science)
Park, Jae Min (Gyeongsangbuk-do Native Fish Business Center)
Publication Information
Korean Journal of Ichthyology / v.27, no.3, 2015 , pp. 189-198 More about this Journal
Abstract
This research has been launched in order to observe the osteological development of sevenband grouper, Epinephelus septemfasciatus larvae and juveniles and will be used for the basic data of phylogenetically systematics research. We got some samples of larvae and juveniles from a adult fish which belongs to the sea cage in Geomun-do, Yeosu-si, Jeolla-namdo province, and we have watched them. The average of breeding water temperature was $21.5{\sim}24.5^{\circ}C$ (average $23.0{\pm}1.5^{\circ}C$). In yolk-sac larvae just after hatching, ossification was not observed at all, and when the average total length reached 2.66 mm, the premaxillary and maxillary forming the upper jaw, dentary forming the lower jaw, and parasphenoid forming the skull base were ossified. In addition, the preopercle and opercle forming the opercular region began to be ossified. The caudal skeleton supporting the caudal fin is built with the caudal complex consisting of the malleus and incus. Until the average total length reached 2.59 mm, ossification did not occur at all and the urostyle bent at 45-degree angle. As to the ossification of the pterygiophore, when the average total length was 6.12 mm, the first interhemal spine began to be ossified in articulation with two spines of the anal fin, and the synapse also began to be ossified in articulation with two spines of the dorsal fin. When the average total length was 21.9 mm, individuals with completed ossification of the interhemal spines and synaptic clefts began to appear.
Keywords
Epinephelus septemfasciatus; juvenile; larvae; osteological development;
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