Seasonal pattern and community structure of fishes in the shallow tidal creek of Obitsu-gawa River Estuary of inner Tokyo Bay, central Japan
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2012, Vol 5, Issue 5
Abstract
Seasonal pattern and the community structure of fishes in the shallow tidal creek of Obitsugawa River Estuary of inner Tokyo Bay was studied for one year. Family Gobiidae corresponded to 98% of the total catch. Dominant species were Gymnogobius uchidai, Gymnogobius macrognathos, Gymnogobius breunigii, Eutaeniichthys gilli, Pseudogobius masago and Favonigobius gymnauchen. Stepwise modelling in canonical correspondence analysis indicated that season (p=0.02) best explained the variation in abundance of fish in this shallow habitat. There was a difference in fish community between spring and summer while only a small difference was observed between summer and autumn as well as winter and autumn. Species dominance was an inherent property of the tidal creek fish community particularly in spring beacuse of the remarkable abundance of G. uchidai. However, the fish community had the tendency to become proportionately even as the season progresses from spring to winter. The occurrence of a particular life history stage generally showed a strong association with month and water temperature. Adults substantially contributed to the population size structure of P. masago and G. uchidai while juvenile 2 for G. breunigii and E. gilli. Larvae significantly contributed to the population size structure of F. gymnauchen while juvenile 1 and juvenile 2 for G. macrognathos. The current study indicated that natural shallow habitat within a highly urbanized metropolitan area in inner Tokyo Bay can serve as a habitat for fishes and the prevalence of certain life history stages of estuarine species indicated the importance of the said habitat at certain part of their life history.
Authors and Affiliations
Joeppette Hermosilla, Yasushi Yasushi , Daisuke Okazak, Yukihiro Hoshino, Masato Moteki, Hiroshi Kohno
Keywords
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