• Title, Summary, Keyword: Species composition

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Species composition and community structure of benthic crustacean assemblage around Oryukdo in southeastern waters off Korea (오륙도 주변해역 저서 갑각류 (Crustacea)의 종조성과 군집구조)

  • Heo, Yu-Sim;Choi, Jung-Hwa;Kim, Jung-Yun;Lee, Dong-Woo
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.50 no.4
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    • pp.604-613
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    • 2014
  • Community structures and species composition in benthic crustacean around Oryukdo of Busan was investigated using a SCUBA diving in 2011. A total 115 species, 51 families, and 4 taxa were collected during the sampling periods. Species were included 52 species in amphipoda, 49 in decapoda, 8 in isopoda and 6 in thoracica. On cluster analysis, the benthic crustacea community was classified into three groups based on the species composition: group A occurred in spring, group B in autumn and winter and group C in summer. Species composition in benthic crustacean corresponded with the water temperature.

Seasonal Variation of Species Composition in Marine Organisms at Oryukdo in the Southeastern waters off Korea (오륙도 주변해역 해양생물의 종조성과 계절변동)

  • Kim, Jung-Yun;Kim, Jung-Nyun;Choi, Jung-Hwa
    • Journal of Fisheries and Marine Sciences Education
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    • v.24 no.6
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    • pp.781-792
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    • 2012
  • Seasonal variation of species composition in marine organisms around Oryukdo of Busan was investigated using a gill net between 2009 and 2011. A total of 82 species, 52 families, and 6 taxa were collected during the sampling periods. Species were included two species in Cnidaria, one in Urochordata, 12 in Mollusca, 12 in Crustacea, seven in Echinodermata, and 48 in Pisces. The dominant species were Crepidula onyx, Asterina pectinifera, Ceratostoma burnetti, Asterias amurensis, Anthocidaris crassispina, and Trachurus japonicus. These six species accounted for 48.4% in the total number. Diversity indices were highest in spring 2009 (2.77) and lowest in spring 2011 (1.66). Seasonal variation of species composition and abundance in marine organisms corresponded with the water temperature.

Post-Reclamation Long-term Changes in Fish Species Composition of Beach Seine Samples in Cheonsu Bay (천수만 방조제 건설 후 대천 해빈 천해 어류의 중장기 종조성 변화)

  • Kwon, Soon Yeol;Hwan, Hak Bin;Hong, Ji Min;Lee, Tae Won
    • Ocean and Polar Research
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    • v.42 no.2
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    • pp.141-155
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    • 2020
  • Species composition of fish in the shallow water at Daecheon beach was determined using monthly beach seine samples collected from April 2010 to March 2011. These data were compared with the previous data, one just after reclamation in 1984-1985, and the other in 1995-96, in order to assess the post-reclamation impact of the environmental change on the fish assemblage. A total of 30 species from 1,464 individuals with biomass of 17,808 g were identified. Dominant species in the number of individuals were Chelon haematocheilus (49.3%), Takifugu niphobles (13.7%) and Paralichthys olivaceus (10.0%). Among pelagic fish, migrant juvenile fish such as Sardinella zunasi and Thryssa kammalensis were abundantly collected in 1984-85, but the catch amount was gradually decreased as time untill only few pelagic fish were collected in 2010-2011. The benthic fish were most abundant in 1984-1985 among habitat groups, and Favonigobius gymnauchen and Kareius bicoloratus were the top two predominants. Species composition of benthic fish did not exhibited drastic changes in 1995-1996, but both the abundance decline and the species composition change was evident in 2010-2011. Among the semi-benthic fish from 1984-1985 samples, Sillago japonica and Konosirus punctatus predominated. Species composition was slightly changed in 1995-1996, but significant changes were met in 2010-2011 with the two predominats, Chelon haematocheilus and Takifufu niphobles. These changes in fish species composition may reflect the post-reclamation effect of the impaired water quality and the accumulation of organic rich fine sediments.

Species composition of the demersal fish assemblage in the coastal waters off Geomun island, Korea (거문도 주변 해역에 출현하는 저어류 군집의 종조성)

  • Kim, Sin-Gon;Jang, Choong-Sik;An, Young-Su;Koh, Eun-Hye;Baeck, Gun-Wook
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.50 no.2
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    • pp.131-138
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    • 2014
  • The study aims at analyzing a species composition of the fish live in bottom of the coastal waters off Geomun island, Korea. To reach the goal of the study, a species composition and it's monthly fluctuation, a monthly fluctuation of the dominant species and it's appearance type was analyzed the fishes caught by the bottom trawl. The result obtained can be summerrized as follows; Fish caught in this area composes 14 orders, 34 families, and 47 species. The largest number of fish species was Perciformes (15 families and 19 species). The most dominant species in an number of fish was jhon dory, Zeus faber which was occupied at 22.5% from the whole number, the second most dominant species was horse mackerel, Trachurus japonicus which was occupied at 21.2%. Four groups were categorized based on appearance time period.

Seasonal Variation of Abundance and Species Composition of Fishes Caught by a Set Net in the Coastal Waters off Yosu, Korea (여수연안 정치망 어획물의 종조성과 계절변동)

  • KIM Yeong Hye;KIM Jong Bin;CHANG Dae Soo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.36 no.2
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    • pp.120-128
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    • 2003
  • Fishes were caught by a set net in the coastal waters off Yosu, Korea from April to October, 2001, and seasonal variation of abundance and species composition were studied. Fifty two species were identified as fish $(89\%)\;cephalopods\;(10\%)\;and\;crustaeans\;(1\%).$ Of the fishes Engraulis japonicus, Trachurus japonicus and Trichiurus lepturus were dominant species representing $64.1\%$ in total number of individuals. The number of species was high in spring and low in summer; number of individuals was high in spring and low in autumn. The diversity index (H') was 0.4-0.7 The abundance and species composition fluctuated seasonally. Occurrence of the various stages of fishes indicated that Scombia japonicus, T. japonicus and E japonicus utilized in the area as spawning ground, Conger myriaster larvae, Ammodytes personatus and Seriola quinqueradiata as nursery ground, and T. lepturus and Ilisha elongata as spawning and nursery grounds.

Winter Composition and Abundance of Demersal Fishes in the Fishing Ground off Eastern Jeju Island, Korea (제주도 동부 먼바다 어장에서 겨울철에 어획된 저서생물의 분포특성)

  • KIM, Jong-Hwa
    • Journal of Fisheries and Marine Sciences Education
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    • v.29 no.1
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    • pp.297-305
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    • 2017
  • This study was analysed the species composition of demersal fishes caught by a bottom trawler, KAYA, in the winter season during 4 years and the study area was the eastern fishing ground in depth of about 110m, 40 miles eastward from Jeju Island, Korea. A total of 54 species were collected, including 40 species of Pises, 9 species of Mollusks, 5 species of Crustaces. The number of individuals and biomass of unit area was $7,978ind/km^2$ and $1,800kg/km^2$, respectively. The dominant species in winter season were Dentex tumifrons, Carangoides equula, Callanthias japonicus, Thamnaconus modestus and Pagrus major. And these also were caught every year. The ranges of the diversity index(H') were 1.97 to 2.40, the richness(R) 1.91~4.59, the evenness(E) 0.54~0.83 and the dominance(D) 0.42~0.61.

Composition and Distribution of Meiobenthos in Amursky Bay (Peter the Great Bay, the East Sea)

  • Pavlyuk Olga N.;Trebukhova Julia A.
    • Ocean Science Journal
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    • v.40 no.3
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    • pp.119-125
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    • 2005
  • Qualitative and quantitative composition of meiobenthos was studied in Amursky Bay (Peter the Great Bay, the East Sea). Ten taxonomic groups were found, where nematodes were dominant. Density of meiobenthos in ground sediments of the Bay were not uniform, and the average density was measured at $126.4{\pm}62.3ind.mo^{-2}$. 56 species of nematodes were detected, and dominant species were Sabatieria palmaris, Paracanthonchus macrodon, Sphaerolaimus limosus, S. gracilis and Oncholaimium ramosum. Five taxocenes of nematodes were allocated based on the results of cluster analysis and species domination according to density. Low diversity in species composition of nematodes was noted in the northwestern part of the Bay, which is a zone of desalination, and in the eastern part, which is exposed to household drains.

Species Composition of Fish Collected in Gill Nets from Youngil Bay, East Sea of Korea (한국 동해 영일만에서 자망으로 채집된 어류 종조성)

  • Hong, Byung-Kyu;Kim, Jin-Koo;Park, Kyeong-Dong;Jeon, Kyeong-Am;Chun, Young-Yull;Hwang, Kang-eok;Kim, Young-Seop;Park, Kie-Young
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.41 no.5
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    • pp.353-362
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    • 2008
  • The fish species composition and variation in the Youngil Bay, East Sea of Korea, were investigated every month from January, 2001, to December, 2002, using gill nets for sample collection. A total of 63 fish species belonging to 31 families under 10 orders, and a total of 40 species belonging to 26 families under 8 orders, were identified in 2001 and 2002, respectively. Of these, the families Pleuronectidae (9 species), Scorpaenidae (8 species) and Cottidae (5 species) were dominant in 2001, whereas Pleuronectidae (4 species), Cottidae (3 species) and Hexagrammidae (3 species) were dominant in 2002. The number of species recovered was the highest in August, 2001 (34 species) and January and September, 2002 (14 species each), and lowest in May, 2001 (6 species) and December, 2002 (5 species). The principal component analysis for each year showed that fish species composition differed over time even within the same sample area. In addition, the relationship between PC scores and temperature showed a positive relationship in 2001, but a negative relationship in 2002.

Variation of Species Composition of Benthic Algae and Whitening in the Coast of Dokdo Island during Summer (하계 독도 연안 해조류의 종조성 변동과 갯녹음현상)

  • Kim, Mi-Gyeong;Sin, Jae-Gi;Cha, Jae-Hun
    • ALGAE
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    • v.19 no.1
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    • pp.69-78
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    • 2004
  • This study was to clarify the variations in a marine ecosystem through examining the species composition of benthic algae in the coast of Dokdo Island during summer (June & August, 2003). The total number of species found in benthic algae was 45 composed of 11% green algae, 29% red algae and 60% brown algae. The dominant species were Enteromorpha linza, Cladophora spp. and Codium frgile for green algae, Ecklonia cave, Eisenia bicyclis, Sargassum confusum, S. patens, S. horneri, Myagropsis myagroides for brown algae and Amphiroa cphedrace. A pusilla, Lithophyllum okamurae, Corallina spp. Laurencia pinnata, L. hamata, Chondria crassicaulit, C. dasyphylla, Gelidium amansii, Neosiphonia yendoi and Polysiphonia yendoi for red algae. The number of benthic algal species decreased more in this study than in previous researches. The whitening of the rocky shore might provoke the decrease of benthic algal biomass and species.

Species Composition and Catch of Korean Tuna Longline Fisheries in the Indian Ocean from 2010 to 2015 (인도양 해역 우리나라 원양 연승어업의 어획물 종조성과 어획동향(2010-2015년))

  • Ku, Jeong Eun;Lee, Sung Il;Kim, Doo Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.51 no.3
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    • pp.286-297
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    • 2018
  • We analyzed scientific observer data to identify species composition and catch trends of Korean tuna longline fisheries in the Indian Ocean. The data were collected by Korean scientific observers onboard Korean tuna longline fishing vessels in the Indian Ocean from 2010 to 2015. The observers identified 94 species including 5 tuna, 6 billfish, 11 shark, 7 other fish, 5 seabird and 1 sea turtle. Albacore tuna Thunnus alalunga and southern bluefin tuna Thunnus maccoyii were the dominant tuna species, and swordfish Xiphias gladius were the most commonly captured billfish. During the survey periods, 87 seabirds were incidentally bycaught. Black-browed albatross Diomedea melanophris was the dominant seabird species in bycatch, especially in 2010. Cluster analysis showed difference in the species composition of catches between the eastern and western Indian Ocean.