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Characteristics of Multi-embryo Egg Capsule and Larvae of Mottled Skate Raja pulchra from Korea  

Jo, Hyun-Su (Fisheries Resources and Environment Division, West Sea Fisheries Research Institute, NFRDI)
Kang, Eon-Jong (Fisheries Resources and Environment Division, West Sea Fisheries Research Institute, NFRDI)
Cho, Yeong-Rok (Aquaculture Industry Division, West Sea Fisheries Research Institute, NFRDI)
Seo, Hyung-Chul (Aquaculture Industry Division, West Sea Fisheries Research Institute, NFRDI)
Im, Yang-Jae (Fisheries Resources and Environment Division, West Sea Fisheries Research Institute, NFRDI)
Hwang, Hak-Jin (Fisheries Resources and Environment Division, West Sea Fisheries Research Institute, NFRDI)
Publication Information
Korean Journal of Ichthyology / v.22, no.4, 2010 , pp. 217-224 More about this Journal
Abstract
An investigation was carried out to obtain basic information needed to develop methods for artificial propagation and conservation of the mottled skate Raja pulchra, an important food resource in western Korea that has declined from overfishing. In this paper we provide evidence of multiple spawning and describe properties of the ovary, and morphology of the egg capsule and the fully-formed offspring. The vitellogenic follicles in the ovary was $179.8{\pm}57.1$ (54~247) and can be classified into five size groups, which the last group of ova are considered as the moving to the capsule gland where fertilization and encapsulation of ova take place. The morphology of the egg capsule of R. pulchra is unique among the species of the family Rajidae and showed multi-embryo characteristics, having two to six yolks in each capsule. The adaptive morphological changes of larvae developing inside the egg capsule are described based on specimens extracted from the capsule.
Keywords
Raja pulchra; multi-embryo; egg capsule; morphology of larvae;
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Times Cited By KSCI : 3  (Citation Analysis)
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