• Title/Summary/Keyword: Pisces

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Comparison of Stomach Contents of Pacific Cod (Gadus macrocephalus) in Korean Coastal Waters (우리나라 연안에 서식하는 대구(Gadus macrocephalus)의 위 내용물 비교)

  • Park, Chung Youl;Gwak, Woo Seok
    • Korean Journal of Ichthyology
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    • v.21 no.1
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    • pp.28-37
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    • 2009

  • The diet of Pacific cod (Gadus macrocephalus) in the East Sea, Yellow Sea and Jinhae Bay was studied by analysis of stomach contents. In total, 518 individuals ranging from 15.5 to 77.0 cm standard length SL were analyzed. Prey organisms of the Pacific cod in the East Sea consistedof Caridea, Cephalopoda and Pisces, whereas In the Yellow Sea, the main food items of Pacific cod were similar to those of East Sea Pacific cod except for Cephalopoda. Interestingly, the stomach contents of Pacific cod in Jinhae Bay is mainly Pisces, which is in contrast to those of the two different coastal areas, the East Sea and the Yellow Sea. Although various species of food were eaten by smaller Pacific cod, both Caridea and Pisces were mainly taken by larger Pacific cod. Consequently, the diet of Pacific cod within acertain size is mainly influenced by prey abundance and prey-size spectrum in its habitat. Higher stomach emptiness of Pacific cod in Jinhae Bay might indicate that fully matured Pacific cod temporally stop feeding during their spawning period.

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Diet composition and trophic level of jack mackerel, Trachurus japonicus in the South Sea of Korea (한국 남해에 출현하는 전갱이(Trachurus japonicus)의 위내용물 조성과 영양단계)

  • KIM, Do-Gyun;SEONG, Gi Chang;JIN, Suyeon;SOH, Ho Young;BAECK, Gun Wook
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.57 no.2
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    • pp.117-126
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    • 2021

  • Diet composition and trophic level of Trachurus japonicus were studied using 417 specimens collected by trawls, set nets and purse seine fisheries from March 2019 to February 2020 in the South Sea of Korea. The size of T. Japonicus ranged from 7.0 to 49.8 cm in total length. T. japonicus were a carnivore that fed mainly on euphausiids and pisces. In eddition, T. japonicus fed on small quantities of cephalopods, crabs etc. T. japonicus showed ontogenetic changes in feeding habits. The proportion of euphausiids decreased inversely proportional to body size whereas the consumption of pisces gradually increased. As body size of T. japonicus increased the mean number of prey per stomach and the mean weight of prey per stomach tended to increase, but the mean number of prey per stomach was not significantly different. As a result of the feeding strategy analysis, T. japonicus were specialized feeders with pisces and euphausiids as their dominant prey. The trophic level ranged between 3.57 ± 0.54 and 3.91 ± 0.65, and increased asymptotically with size of specimens. The average trophic level of the T. japonicus was 3.79 ± 0.61.

  • https://doi.org/10.3796/KSFOT.2021.57.2.117 인용 PDF KSCI

Feeding Habits of the Shotted Halibut, Eopsetta grigorjewi in the West Sea from Korea (한국 서해에 출현하는 물가자미, Eopsetta grigorjewi의 식성)

  • Dong Hyuk Choi;Byoung Il Youn;Soo Jeong Lee;Kyeong Ho Han;Dae Hyeon Kwon
    • Korean Journal of Ichthyology
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    • v.36 no.1
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    • pp.77-83
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    • 2024

  • The feeding habits of shotted halibut, Eopsetta grigorjewi, were studied by examining the stomach contents of 419 individuals. We collected E. grigorjewi samples using offshore gill net and bottom trawl in West Sea of Korea from January to December 2019. The specimens ranged in total length (TL) from 22.5 to 50.3 cm. The main prey organisms were Macrura and Pisces, while Brachyura, Ophiuroidea, Littorinimorpha and Paguridea were found small amounts. E. grigorjewi fed on Macrura in summer and autumn, and mainly fed on Pisces in winter and spring. Smaller individuals (<30 cm TL) consumed Macrura such as Crangon hakodatei. The proportion of these prey items decreased with increasing Pisces such as Ammodytes personatus and Engraulis japonicus. The feeding strategy of E. grigorjewi is estimated to maintain prey individual as they grow, but increase their prey weight.

  • https://doi.org/10.35399/ISK.36.1.9 인용 PDF HTML

Feeding Habits of Whitespotted Conger, Conger myriaster in the West Sea of Korea (한국 서해에 출현하는 붕장어(Conger myriaster)의 식성)

  • Da Yeon Kang;Do-Gyun Kim;Gi Chang Seong;Suyeon Jin;Jae Mook Jeong;Su Kyung Kang;Gun Wook Baeck
    • Korean Journal of Ichthyology
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    • v.35 no.3
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    • pp.177-182
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    • 2023

  • Total 158 Conger myriaster were examined and the range of Preanal length (PaL) was 8.2~40.1 cm and average Preanal length was 17.3 cm. Proportion of the empty stomach was 30.4% and individuals, which the prey items were found in stomach, were 110. The most important prey component in the diets of C. myriaster was Pisces that constituted 54.4% in %IRI (Index of relative importance). Engraulis japonicus was the most important prey component in Pisces. Macrura was the second largest prey component and Crangon hakodatei was the most important prey component in Macrura. The result of analysis in ontogenetic changes significantly exhibited among three size classes (<15.0 cm, 15.0~20.0 cm, ≥20.0 cm). The proportion of Macrura decreased as increasing body size, whereas the consumption of Pisces increased gradually. As body size of C. myriaster increased, the mean weight of prey per stomach (mW/ST) increased (one way-ANOVA, P<0.05).

  • https://doi.org/10.35399/ISK.35.3.4 인용 PDF HTML