Seasonal changes in species composition of a demersal fish community in the shallow waters near a sandy beach in eastern Hiuchi-nada, central Seto Inland Sea, Japan
2016
Yamamoto, M. (Kagawa Prefectural Fisheries Experimental Station, Takamatsu, Kagawa (Japan)) | Shoji, J.
To examine seasonal changes in composition of dominant species in demersal fish community on a sandy beach in the Seto Inland Sea, we conducted a beam trawl survey between May 2002 and September 2005. A total of 14,013 individuals, belonging to more than 39 species, were collected at 1.0-5.7 m depths (measured at each tow). The tidal variation was approximately 3 m at this beach, the water temperature ranged from 9.0 (February) to 30.3degC (August), and the salinity from 28.7 (July) to 33.7 (March). The mean number of fish species per tow ranged from 1.25 (January) to 9.50 (June) and fish abundance (number of individuals /100 square m) from 0.6 (January) to 103.5 (October). Both species number and the abundance increased from spring to summer and decreased from autumn to winter with a significant positive correlation with water temperature each month. The numerically dominant species were Favonigobius gymnauchen (62.6%), Tarphops oligolepis (11.4%), Sillago japonica (6.7%), unidentified Repomucenus (6.4%), Heteromycteris japonica (3.3%) and Paralichthys olivaceus (3.2%).
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