Change of Structure Community of Fish Collected by a Gape Net with Wings after 12 Years in the Coast of Wando Island, Korea

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We examined the inter-annual changes in the community structure of fish in the Yeosu coast during the spring fishing period (May June) from 2008 to 2015. Using a both sides fyke net, we collected 74 taxa, of which the dominant species was Trachurus japonicus. In the years 2009-2010 and 2015, when the relative abundance of T. japonicus decreased, the fish species diversity increased, as estimated from the rarefaction curve and beta-diversity, resulting in a significant difference in the fish community structure between two year groups: one comprising 2009-2010 and 2015 and the other comprising 2008 and 2011-2014. T. japonicus may be a keystone species that plays a critical role in temporal changes in the community structure of fish caught by fyke nets along the southern coast of Korea. Obvious modes in the length-frequency of T. japonicus smaller than fork length (FL) 10 cm were observed continually during the study, while the frequency of T. japonicus bigger than FL 15 cm declined rapidly after 2010. The new recruitment of smaller T. japonicus before and after 2010 appeared beginning in June and May, respectively.

“…(2014) Yoo et al (2015) . Yoo et al (2014) 2001 2013 , Yoo et al (2015Yoo et al ( ) 2013Yoo et al ( -2015 . , .…”

Section: 서 론mentioning

confidence: 99%

Inter-annual Changes in the Community Structure of Fish Caught by a Both Sides Fyke Net in the Yeosu Coast during the Spring Fishing Period

Yoo¹,

Kim²,

Song³

et al. 2016

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“…, , (Engralius japonicus) (Cho et al, 2014). , 90% (Han and Oh, 2007;Shin et al, 2013;Yoo et al, 2014).…”

mentioning

confidence: 99%

Species Composition of Fish Collected by a Gape Net with Wings in the Coastal Waters of Jindo, Korea

Jeong¹,

Yoo²,

Kim³

et al. 2015

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Species composition of the fish in the coastal waters of Jindo was determined using monthly sample collection by a gape net with wings in 2014. Of a total of 41 fishes collected, the dominant species were Engraulis japonicus, Thryssa kammalensis, Sardinella zunasi, Leiognathus nuchalis, Amblychaeturichthys hexanema, Neosalanx anderssoni, Acanthogobius flavimanus. The former three species were the migratory species and the other four species were the resident species. These 7 fishes accounted for 99.6% of the total number of individuals collected. Monthly species composition did not show a clear seasonal trend. The peak number of individuals occurred in May, lowest in November. Fish were divided into four groups by the cluster analysis.

Changes in the Community Structure of Fish Collected by a Gape Net with Wings in the Coastal Waters of Jindo Island in Response to a Cold Water Appearance in the Southwestern Sea of Korea

Yoo¹,

Seong²,

Kim³

2015

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We examined the community structure of fish off the coast of Jindo Island in response to a cold water appearance in the southwestern sea of Korea each August between 2013-2015. Using a gape net with wings, we collected 31 taxa during the study period, wherein the most dominant species was Engraulis japonicus. Collichthys lucidus and Neosalanx andersoni, which are mainly distributed in the western sea of Korea, increased in abundance and were dominant in August 2013, possibly due to the apparent intrusion of cold water (< 19°C) from offshore into the coastal waters of Jindo Island. Meanwhile, Scomberomorus niphonius and Sardinella zunasi, which are known as warmwater migratory species, increased in abundance and were dominant in August 2015, likely influenced by the warmer water (> 20°C) at the coast, which resulted in a noticeable lessening of the cold water in the study area. However, no significant differences were observed in fish community structure in the month of August between 2013-1015. This implies that the small-scale spatial and temporal variations in the cold water had limited effects on the fish community structure, even though the abundances of several dominant species varied in the coastal waters.