Abstract ▼ AI-Helper

Monthly variation in species composition of fishes in the eelgrass bed of Jangpyeong in Tongyeong, Korea was determined using monthly samples by a seine net from May 2016 to April 2017. A total of 32 species, 2,042 individuals and 3,991 g of fishes were collected during study period. The dominant sp...

Monthly variation in species composition of fishes in the eelgrass bed of Jangpyeong in Tongyeong, Korea was determined using monthly samples by a seine net from May 2016 to April 2017. A total of 32 species, 2,042 individuals and 3,991 g of fishes were collected during study period. The dominant species were Takifugu niphobles, Rudarius ercodes, Gymnogobius heptacanthus, Zoarchias glaber, Pholis nebulosa. these species accounted for 73.6% of total number of individuals. Seasonal variation of species composition showed that the dominant species, used the shallow area of the eelgrass bed as a nursery ground. The fish assemblages in the eelgrass bed showed clear seasonal changes; the number of fish species increased in March and were highest in October. The number of individuals increased in December and were highest in July. The diet composition of T. niphobles was studied using 587 individuals collected. The standard length (SL) of the specimens ranged from 0.7 to 9.0 cm. The stomach contents analysis indicated that T. niphobles consumed mainly amphipods (%IRI: 91.0%). In addition T. niphobles ate small quantities of copepods, polychaetes, insects, bivalves, and crabs. T. niphobles consumed mainly amphipods in all size class. Smaller individuals (less than 4 cm SL) fed mainly on amphipods and copepods. The proportion of copepods decreased, as body size increased, whereas the consumption of polychaetes increased gradually. The seasonal variation in the diet composition of T. niphobles was significant. Amphipods were most common prey during four seasons. Copepods were decreased in summer to spring gradually. Whereas, the consumption of polychaetes were increased in autumn.

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