• Fisheries and Aquatic Sciences
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• v.13 no.4
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• pp.278-283
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• 2010

Black plaice, Pleuronectes obscurus (Herzenstein), were collected and fertilized to observe egg development, temperature-related cleavage rates, and mitotic intervals (${\tau}_0$). Fertilized egg was demersal, adhesive, and did not contain oil globules. After 1.75 h, the blastodisc formed, and hatching took place 121 h after fertilization at $14^{\circ}C$. The hatched larvae were $3.5{\pm}0.16\;mm$ in total length. At higher temperatures, eggs developed faster and underwent further identical developmental processes. Additionally, ${\tau}_0$ and water temperature were strongly negatively correlated at all temperatures (Y=-2.6981X+98.767, $R^2$=0.9831, where Y is ${\tau}_0$, and X is temperature) for black plaice.

• Fisheries and Aquatic Sciences
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• v.10 no.1
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• pp.24-29
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• 2007

Our objective was to clarify the cytogenetic characteristics, including karyotypes, cellular DNA content, and nuclear size of erythrocytes, of black plaice Pleuronectes obscurus, dotted gizzard shad Konosirus punctatus, and perch sculpin Pseudoblennius percoides, collected from the coastal areas of Jo Island, Busan, Korea. Karyotypes of P. obscurus and K. punctatus both had a diploid number of 48 and a fundamental number (FN) of 48, with a chromosome formula of 48T. The karyotype of p. percoides had a diploid number of 46 and FN of 56, with a chromosome formula of 10SM +36T. No sex-associated heteromorphic pairs were detected for any species. The variation in DNA values (P. obscurus=1.15 pg/nucleus, K. punctatus=1.56pg/nucleus, P. percoides=1.11 pg/nucleus) was positively related to variation in chromosome FN.