Shore larval and juvenile fishes collected by light-trap sampling at the foot of the Gotsu Lighthouse, Shimane Prefecture, Japan

島根県江津灯台麓の海域で灯火採集によって得られた仔稚魚

Shore larval and juvenile fishes collected by light-trap sampling at the foot of the Gotsu Lighthouse, Shimane Prefecture, Japan

Totals of 4,193 and 3,000 of larval, juvenile and adolescent fishes representing about 45 and 46 fish species were collected by monthly light–trap sampling respectively on rocky and on sandy shores at the foot of the Gotsu Lighthouse, Shimane Prefecture, Japan after sunset of the high tide during the flood tide from January to December, 1998. A high number of species occurred from January to March on the rocky shore, and from January to May on the sandy shore, respectively. Number of each species in each month sampled from the rocky and sandy shores were analyzed by Hayashi's quantification theory III (multivariate analysis) and cluster analysis (Ward method) for clarifying the characteristics of occurrence patterns of each fish species. Five clusters were defined in the rocky shores as follows： Cottidae, Stichaeidae and Chaenopsidae fish occurred from January to April, Acanthopagrus schlegelii and Girella punctata occurred in May and June, Rhinogobius spp. and Acentrogobius spp. occurred in July and August, Iso sp. and Omobranchus elegans occurred in September and October, few fish species occurred in November and December. Six clusters were defined in the sandy shores as follows： Cottidae, Stichaeidae and Chaenopsidae fish occurred from January to April, Engraulis japonica and G. punctata occurred in May and June, Spratelloides gracilis and Gymnapogon sp. occurred in July and August, S. gracilis, E. japonica and Iso sp. occurred in September and October, S. gracilis and Acanthopagrus latus occurred in November, Plecoglossus altivelis altivelis, Mugil cephalus cephalus and Sebastiscus marmoratus occurred in December. These results indicate that these shores adjoining to the Gonokawa River (Class A river) are utilized as a nursery for various larval, juvenile and adolescent stages of the saltwater and diadromous fish species.

Creators Takeshita Naohiko

Creators Yamada Tomoyo

Creators Shimada Makoto

[ISSN]0370-9361