Browsing by Author "Ohno, A."
Larval intervals of the sea bass, Lates calcarifer, based on the development of swimming and feeding functions. H Kohno, M Duray, A Ohno & Y Taki - In LM Chou, AD Munro, TJ Lam, TW Chen, JK, Ding, KK Hooi, HW, Khoo, VPE Phang, KF Shim & CH Tan (Eds.), The Third Asian Fisheries Forum. Proceedings of the Third Asian Fisheries Forum, 26-30 October 1992, Singapore, 1994 - Asian Fisheries SocietyDevelopmental sequences of characters concerned in swimming and feeding function were examined on laboratory-reared seabass larvae. Based on a scheme of development events constructed in this study, the early life hisory of the species can be divided into the following five phases. A (to about 2.5 mm TL): larvae have no noticeable skeletal structure concerned in swimming and feeding function. B (to about 4.5 mm TL): principal elements of swimming-related characters appear and start to develop; jaw and pharyngeal teeth strt to develop. C (to about 6.0 mm TL): position of the greatest body depth begins to shift bacward; dorsal and anal fin-rays attain to adult commplements; serration-like upper jaw teeth decrease in number and finally disappear. D (to 7.0 - 7.5 mm TL): notochord end flection is completed; conical spper jaw teeth start to develop, replacing the serration-like teeth. E (beyond 7.0 - 7.5 mmTL): larvae can be regarded as reaching juvenile stage in this phase from the view-point of functional morphology, although the first larvae with completely develop fin-ray counts was 10.25 mm TL in this study.
Seasonal availability of calanoid copepods (genus Acartia) in eastern Thailand using a light trap, as food organisms for marine fish larval rearing Zooplankton collected by the torch lighting method were investigated in a tropical coastal seawater pond in eastern Thailand. Copepods of the genus Acartia, such as A. sinjiensis, A. erythaea and A. pacifica, were predominant among the zooplankton collected. A. sinjiensis occurred almost throughout the year with a prolonged peak season from August to April. The highest abundance of adult A. sinjiensis aggregated under the light reached 35,700 individuals•l-1. The occurrence of A. erythaea and A. pacifica was intermittent with a short-term peak from March to April, during which their abundance was higher than A. sinjeinsis. The combination of water temperature and salinity was suggested to affect or regulate the biomass of these Acartia species. Among the Acartia species, A. sinjiensis seems to be the most important as a food organism available for marine fish larval rearing in eastern Thailand.