Age, growth and life history of gunnel, Pholis fangi, in the Yellow Sea |
| |
Authors: | Sun-Do Hwang Tae-Won Lee Sun-Wan Hwang |
| |
Institution: | aNational Fisheries Research and Development Institute, Busan 619-705, Republic of Korea;bDepartment of Oceanography, Chungnam National University, Daejeon 305-764, Republic of Korea;cKorea Ocean Research and Development Institute, Ansan 425-600, Republic of Korea |
| |
Abstract: | We examined the formation of annuli by marginal observations on otoliths of gunnel (Pholis fangi) in the Yellow Sea to validate the age determination method and to derive the growth equation covering from larval to adult stages. Gunnels, ranging from 46 to 173 mm in total length, were collected by a bag net fishery from the western coastal waters off Korea from November 1998 to October 1999. Marginal observations indicated that the translucent zone (annual mark) on adult otolith was formed during the winter, whereas the opaque zone was formed during the summer. However, a translucent zone was formed between May and June in juvenile otoliths. This false ring was formed when the fish transited from the inshore pelagic life of larvae to the offshore bottom life of juveniles. The observed maximum age was 58 months. Using observed length-at-monthly age, growth in length was expressed by von Bertalanffy growth curve; Lt = 144.0 (1 − e−0.11 (t+0.43)). P. fangi spawned in winter recruit to inshore, and grow quickly in the nursery habitats in spring. Gunnel inhabit the bottom offshore area during the summer season, and reappear inshore thereafter. |
| |
Keywords: | Gunnel Pholis fangi Otolith Age Growth Yellow Sea |
本文献已被 ScienceDirect 等数据库收录! |
|