• Title, Summary, Keyword: Ichthyoplankton

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Ichthyoplankton Detection Proportion and Margin of Error for the Scomber japonicus in Korean Coastal Seas

  • Kim, Sung;Cho, Hong-Yeon
    • Ocean and Polar Research
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    • v.39 no.2
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    • pp.73-84
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    • 2017
  • The probability distribution of ichthyoplankton is important for enhancing the precision of sampling while reducing unnecessary surveys. To estimate the ichthyoplankton detection proportion (IDP) and its margin of error (ME), the monitoring information of the chub mackerel's (Scomber japonicus) ichthyoplankton presence-absence sampling data has been were collected over approximately 30 years (from 1982 to 2011) in the Korean coastal seas. Based on the computed spatial distributions of the mackerel's IDP and ME, the confidence interval (CI) range, defined as 2 ME, decreases from approximately 80% to 40% as the sample size n increases from 4 to 24 and the ME is approximately 40% in the typical (seasonal survey) case n = 4 per year. The IDP and ME off Jeju Island are relatively high at the 0.5-degree smoothing level. After increasing the spatial smoothing level to 1.0-degree, the ME decreased, and the spatial distribution pattern also changed due to the over-smoothing effects. In this study, the 0.5-degree smoothing is more suitable for the distribution pattern than the 1.0-degree smoothing level. The area of the high IDP and the low ME on the mackerel's ichthyoplankton was similar to the estimated spawning ground in the Korean peninsula. This information could contribute to enhancing for the spawning ecology surveys.

Spatio-temporal distribution of the Ichthyoplankton in the Mankyong-Dongjin Estuary (만경 동진강 하구의 浮流性 卵 仔稚漁 分布 樣相)

  • 차성식;박광재
    • 한국해양학회지
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    • v.26 no.1
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    • pp.47-58
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    • 1991
  • To study the spatio-temperal distribution of the ichhyoplankton in the estuarine ecosystem, Ichthyoplankton were sampled with associated data on water temperature and salinity in Mankyong-Dongjin Estuary on October, 1989, and March, May and July, 1990. Water temperature varied seasonally, showing homogeneous spatial pattern. The spatial difference in splinty was determined by the amount of river runoff. Few Ichthyoplankton occurred in October and March. In May, Konosirus punctatus occupied most of the ichthyoplankton. In July, Sardinella zunasi, Engraulis japonica, Gobiidae, and Thrissa sp. were the dominant species. The eggs and larvae of Engraulis japonica were collected from the outer bay, while those of Konosirus punctatus predominated in the less saline inner bay. Konosirus punctatus. Sardinella zunasi, Gobiidae, and Thrissa sp. were the characteristic species of this estuary. They were considered to be spawned and grown during their early life stage in the less saline water.

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Species Composition of Fish Eggs and Larvae in Spring and Autumn around Dokdo in the East Sea of Korea (독도 주변해역에서 봄과 가을철 어란과 자치어의 종조성에 관한 연구)

  • Kim, Sung;Yoo, Jae-Myung;Lee, Eun-Kyung
    • Ocean and Polar Research
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    • v.24 no.4
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    • pp.443-448
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    • 2002
  • A study on the ichthyoplankton assemblage was conducted around Dokdo in the East Sea in September 1999 and May 2000. Sixteen species of fish larvae including eggs were collected during the surveys. Anchovy (Engraulis japonicus) eggs and larvae were comprised of 2.0% and 94.5% of total samples in number, respectively. Muller's pearlside (Maurolicus muelleri) eggs and larvae were comprised of 95.0% and 3.2%, respectively. The other species mostly composed of warm water species were less than 2% of total samples in number. The number of species and abundance of the fish lawae and eggs were higher in September than in May. Although there were limited data on the ichthyoplankton around Dokdo in summer and winter, this study area seems to be used for the spawning or nursery ground of fishes.

Seasonal Variation of Abundance and Species Composition of Ichthyoplankton in the Coastal Water off Tongyoung, Korea (통영해역의 자치어 종조성과 계절변동)

  • PARK Kyeong Dong;MYOUNG Joung Goo;KANG Yong Joo;KIM Yong Uk
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.38 no.6
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    • pp.385-392
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    • 2005
  • Seasonal variation of abundance and species composition of ichthyoplankton were studied in the coastal water off Tongyoung, Korea. Monthly samples were collected using a ring net which were towed horizontally at 4 different stations from March, 1998 to February, 1999. A total of 74 species representing 35 families and 8 orders were found. Of these species 40 species (17 families) were Perciformes. Of the fish larvae couected Engraulis japonicus, Repomucenus sp., Parablennius yatabei, Synechogobius hasta, and Tridentiger sp. were the dominant species representing $80.6\%$ in total number of individuals. The number of species was highest in August and lowest in December; number of individuals was highest in May and lowest in November. The diversity index (Shannon and Wiener Index) was highest in march, and lowest in December.

Key for the Identification of the Ichthyoplankton in the Mid-East Coastal Waters of the Yellow Sea (黃海 中東部 沿岸域의 浮游性 卵 仔稚魚의 檢索表 作成 硏究)

  • 차성직;유재명
    • 한국해양학회지
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    • v.22 no.4
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    • pp.236-245
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    • 1987
  • Ichthyoplankton were sampled with Bongo net at 13 stations from Chonsu Bay to Keum Estuary from July, 1985 to June, 1986. 19 taxa of pelagic eggs and 45 taxa of larvae were collected. The key to identify the pelagic eggs is based on the number of oil gloubles, the shape of the egg, the sculpture of the chorion, and the size of the egg and the oil globules. The key to the families of fish larvae is based on the morphometric characters such as the body shape, the position of the anus, the pigmentation pattern, and others.

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Seasonal Variation and Species Composition of Ichthyoplankton in Sunchon Bay, Korea (순천만에 분포하는 부유성 난과 자치어(仔稚魚)의 종조성 및 양적변동)

  • Han, Kyeong-Ho;Kim, Doo-Yong;Jin, Dong-Soo;Shin, Sang-Soo;Baik, Seung-Rock;Oh, Sung-Hyun
    • Korean Journal of Ichthyology
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    • v.13 no.2
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    • pp.136-142
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    • 2001
  • The ichthyoplankton were sampled during six different months (January, March, May, July, September and November 1998) to study seasonal variation and species composition of the ichthyoplankton in Sunchon Bay. During the study, fish eggs collected in May and July were identified as belonging to 4 species. The most of dominant species Engraulis japonicus accounted for 54.1% of the total fish eggs, followed by Leiognathus nuchalis (21.8%), Ilisha elongata (12.7%) and Konosirus punctatus (11.4%). The collected larvae and juveniles were identified into 12 taxa. 11 of which were identified to species level, and 1 taxa identif ied only to family level, respectively. The dominant species, Ilisha elongata, accounted for 48.9% of the total larvae and juveniles: it was followed by Pholis nebulosa at 31.8%. A species of Gobiidae and Thryssa hamiltoni accounted for 15.8% and 2.2% of the total, respectively. The 4 taxa constituted 98.7% of the total collected larvae and juveniles.

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Distribution of Ichthyoplankton in the Adjacent Waters of Yousu (여수주변해역의 치자어 분포)

  • YOO Jae Myung;LEE Eun Kyung;KIM Sung
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.3
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    • pp.295-302
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    • 1999
  • To study the distribution of ichthyoplankton in the adjacent waters of Yousu, ichthyoplankton were sampled 4 times (September 1996, November 1996, February 1997 and May 1997). Four species of fish eggs and twenty-four species of fish larvae were identified. Among fish eggs, Engraulis japonicus eggs were the dominant species comprising $80.6\%$ of the total fish eggs collected, followed by Callionymidae spp. $1.6\%$, Konosirus punctatus and Maurolicus muelleri occupied below $1.0\%$ respectively, while $17.8\%$ were unidentified. Most larval fish species were found in September (17 species). In fish larvae, Callionymidae spp. was the dominant species occupying $25.7\%$ of total fish larvae collected and than followed by Gobiidae spp. $23.5\%$, Sillago japonica $17.2\%$ Engraulis japonicus $12.2\%$, Omobranchus elegans $9.9\%$ and the unidentified species were less than $2.0\%$. The larvae fish species collected in this study area were comprising the coastal sedentary species (Gobiidae, Callionymidae, Hexagrammos otakii and io on), and the warm water species (Auxis spp. and Coryphaena hipurus and Pomacentridae spp.) which were appearing by warm water current flowing near the costal area of Cheju Island.

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Quantitative fluctuation and species composition of ichthyoplankton in Gwangyang Bay, Korea (광양만 연안에 분포하는 부유성 난 및 자치어의 종조성과 양적변동)

  • CHU, Bo-Ra;LEE, Sung-Hoon;YU, Tae-Sik;HWANG, Tae-Yong;HAN, Kyeong-Ho
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.55 no.3
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    • pp.233-242
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    • 2019
  • Species composition and yearly variation of fish eggs and larval fishes were investigated from 2014 to 2016. During the study period, the fish eggs were identified as belonging to 14 taxa. The dominant species of fish eggs were Leiognathus nuchalis, Engraulis japonicus, and Konosirus punctatus. These three species accounted for 97.4% of the total number of individuals collected. The collected larval fishes were identified into 37 taxa, 22 families, and seven orders. The dominant species of larval fish were Leiognathus nuchalis, and Gobiidae fishes. These three species accounted for 85.4% of the total number of individuals collected. The diversity index of the larval fishes was the highest in 2014 (H' = 1.60) and the lowest in 2015 (H' = 1.15). The evenness index was the highest in 2016 (J = 0.51) and the lowest in 2015 (J = 0.39). The dominance index was the highest in 2015 (D = 83.5%) and the lowest in 2016 (D = 70.9%). In addition, the economically important species in this area were Engraulis japonicus, Konosirus punctatus, Hippocampus coronatus, Sebastes schlegelii, Acanthopagrus schlegeli, and Cynoglossus joyneri.

Distribution of Ichthyoplankton in coastal waters of Nanji Island (당진 난지도 주변해역에서 분포하는 부유성 난 및 자치어의 종조성)

  • YOUN, Byeong-Il;HAN, Kyung-Ho;LEE, Sung-Hun
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.54 no.4
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    • pp.287-295
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    • 2018
  • The ichthyoplanktons were sampled to study distribution of the ichthyoplankton in coastal waters of Nanji-Island in August and November 2015 and January and May 2016. During the study, fish eggs of eight different species were collected. Engraulis japonicus was the most dominant species which accounted 44.80%. Sebastes schlegeli comprised 31.39% of the total larvae and juveniles. The diversity index of species per month of the collected juveniles at Nanji Island from 2015 to 2016 was 0.598-1.770 and the evenness index was 0.432-0.761. In case of dominance index was 0.619-0.897 against the evenness index. The analyzed species diversity index by the each station was 0.818-1.945 and the dominance index was 0.492-0.897 against the species diversity index. The months of August and May exhibited similar results. In addition, the community structure was very similar in state 2 and state 3.

Seasonal Variation in Species Composition of Ichthyoplankton in Northern Jinhae Bay, Korea (진해만 북부 해역에 분포하는 부유성 난 및 자치어의 종조성 및 양적변동)

  • Han, Kyeong-Ho;Yu, Tae-Sik;Lee, Jin;Lee, Sung-Hoon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.51 no.1
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    • pp.72-78
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    • 2018
  • Fish eggs and larvae were collected in July and November of 2013 and January and May of 2014 to determine seasonal variation in the species composition of ichtyoplankton. Samples were classified based on morphological characteristics. Fish eggs were identified as belonging to five taxa; the most dominant species of fish eggs was Engraulis japonicus (62.05%) followed by Sardinops melanostictus (21.02%) and Leiognathus nuchalis (13.71%). These three species accounted for 96.8% of the total number of fish eggs collected. Larvae of 17 species in six families, and six orders were collected. The most dominant species of fish larvae was E. japonicus (51.79%), followed by L. nuchalis (12.59%) and Omobranchus elegans (12.08%). These three species accounted for 76.46% of the total number of larvae collected. Jinhae Bay was identified as a major spawning and nursery ground for fish species inhabiting in the south coast of Korea, such as E. japonicus, L. nuchalis, S. melanostictus, and Omobranchus elegans. Therefore, management of marine fish resources in the South Sea should necessarily include the ecological management of Jinhae Bay.