• Title/Summary/Keyword: gammarid amphipods

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Feeding Habits of Pseudoblennius percoides (Pisces; Cottidae) in an Eelgrass (Zostera marina) Bed of Dongdae Bay (동대만 잘피밭에 서식하는 돌팍망둑(Pseudoblennius percoides)의 식성)

  • Huh, Sung-Hoi;Kwak, Seok Nam;Kim, Ha Won
    • Korean Journal of Ichthyology
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    • v.20 no.1
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    • pp.45-53
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    • 2008
  • Feeding habits of Pseudoblennius percoides collected from the eelgrass bed in Dongdae Bay from January to December 2005 were studied. P. percoides was a carnivore which mainly consumed fishes and caridean shrimps. Its diets included small quantities of mysids,amphipods (gammarid amphipods and caprellid amphipods), copepods, cephalopods, polychaetes,and crabs. P. percoides undergoes significant size-related changes; smaller fish (<3.0 cm SL) prey mainly copepods, gammarid amphipods, and mysids while the proportion of caridean shrimps and fishes increases with fish size. Fishes and caridean shrimps were major prey organisms for all seasons. Dietary breadth of P. percoides was lower with fish size and seasons.

Feeding Habits of Blotched Eelpout, Zoarces gilli Collected in the Coastal Water off Gadeok-do, Korea (한국 남해 가덕도 주변에서 채집된 등가시치 (Zoarces gilli)의 식성)

  • Huh, Sung-Hoi;Baeck, Gun-Wook
    • Korean Journal of Ichthyology
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    • v.12 no.1
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    • pp.54-61
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    • 2000
  • Feeding habits of Zoarces gilli collected in the coastal water off Gadeok-do, Korea from March 1998 to February 1999 were studied. Z. gilli was a carnivore and consumed mainly shrimps, gammarid amphipods, fishes, bivalves and cumaceans. Its diets also included small quantities of copepods, caprellid amphipods, ostracods, crabs, squids, gastropods, ophiuroids and polychaetes. It showed ontogenetic changes in feeding habits. Individuals of small size (10~15 cmSL) fed mainly on small prey organisms such as gammarid amphipods, bivalves, cumaceans and ostracods. However, larger shrimps and fishes were heavily selected with increasing fish size.

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Feeding habits of juvenile Acanthopagrus schlegeli in the eelgrass(Zostera marina) bed in Kwangyang Bay (광양만 잘피밭에 서식하는 감성돔(Acanthopagrus schlegeli) 유어의 식성)

  • Huh, Sung-Hoi;Kwak, Seok-Nam
    • Korean Journal of Ichthyology
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    • v.10 no.2
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    • pp.168-175
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    • 1998
  • Feeding habits of juvenile Acanthopagrus schlegeli collected from the eelgrass bed in Kwangyang Bay were studied. A. schlegeli (1~7cm SL) was a carnivore which consumed mainly amphipods (gammarid and caprellid amphipods), crabs and shrimps. Its diets included small quantities of gastropods, polychaetes, hydroids, tanaids, copepods and isopods. A. schlegeli showed ontogenetic changes in feeding habits. Small individuals preyed mainly on gammarid amphipods, gastropods and polychaetes. However, crabs and shrimps were heavily selected with increasing fish size.

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Feeding ecology of three tonguefishes, genus Cynoglossus (Cynoglossidae) in the Seto Inland Sea, Japan

  • Baeck, Gun-Wook;Park, Joo-Myun;Hashimoto, Hiroaki
    • Animal cells and systems
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    • v.15 no.4
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    • pp.325-336
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    • 2011
  • Feeding ecology was compared among the three tonguefishes Cynoglossus abbreviatus, C. joyneri and C. robustus, collected from Seto Inland Sea, Japan, from June 2000 to May 2001. They are benthivores, consuming mainly gammarid amphipods, shrimps, crabs, gastropods, bivalves and ophiuroids. C. abbreviatus consumed greater proportions of ophiuroids whereas C. joyneri and C. robustus ate more amphipods and shrimps. While C. abbreviatus consumed mostly ophiuroids in all size classes, the diets of C. joyneri and C. robustus showed ontogenetic changes in feeding habits; smaller individuals of C. joyneri and C. robustus consumed gammarid amphipods, whereas larger C. joyneri ate shrimps and gastropods, and larger C. robustus fed mainly on gastropods, crabs, bivalves and polychaetes. Cluster analysis based on diet similarities emphasized that the three Cynoglossus species could be categorized on a size-related basis into three feeding groups: smaller C. joyneri and C. rubustus (<25 cm TL) could be classified as group A, and the larger of them (>25 cm TL) as group B, whereas C. abbreviatus was categorized as group C. This means that some degree of resource partitioning can occur among the three Cynoglossus species. The seasonal changes in the diets were also significant for the three Cynoglossus species.

Abundances and feeding habits of Hippocampus coronatus in an eelgrass (Zostera marina) bed of Dongdae Bay, Korea (남해안 동대만 잘피밭에서 서식하는 해마(Hippocampus coronatus)의 출현량 및 먹이습성)

  • Huh, Sung-Hoi;Park, Joo Myun;Kwak, Seok Nam;Seong, Bong Jun
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.50 no.2
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    • pp.115-123
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    • 2014
  • A total of 164 individuals of Hippocampus coronatus were collected from an eelgrass bed in Dongdae Bay, Korea from September 2006 to August 2007. The number of individuals of H. coronatus was higher in September 2006. The size of H. coronatus ranged from 2.4 to 9.3cm in height (Ht), and most of individuals were small size below 5cm (Ht). H. coronatus was a carnivore which consumed mainly gammarid amphipods and copepods. Its diets also included a small amount ofmysids, ostracods, brachiopods, caprellid amphipods, bathynellaceas, isopods, tanaids, and ascothoracids. The diets of H. coronatus underwent size-related changes; smaller individuals consumed copepods, while larger individuals ate gammarid amphipods and mysids. The dietary breadth index of H. coronatus was increased with increasing of their size.

Feeding habits of Pholis nebulosa (베도라치(Pholis nebulosa)의 식성)

  • Huh, Sung-Hoi;Kwak, Seok-Nam
    • Korean Journal of Ichthyology
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    • v.9 no.1
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    • pp.22-29
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    • 1997
  • Feeding habits of Pholis nebulosa collected from a eelgrass bed in Kwangyang Bay from January 1994 to December 1994 were studied. Pholis nebulosa was a carnivore which mainly consumed epiphytal amphipods. Its diets included minor quantities of caridean shrimps, isopods, copepods, tanaids and polychaetes. It showed ontogenetic changes in feeding habits. In an initial feeding stage, copepods were major food organisms. However, gammarid and caprellid amphipods were heavily selected with increasing fish size. Although gammarid and caprellid amphipods were major prey organisms for all seasons, the relative proportion of these two food items changed with season.

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Feeding Habits of Lateolabrax Japonicus in the Eelgrass ( Zostera Marina ) Bed in Kwangyang Bay (광양만 장피밭에 서식하는 농어 ( Lateolabrax Japonicus ) 의 식성)

  • Heo, Seong-Hoe;Gwak, Seok-Nam
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.34 no.2
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    • pp.191-199
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    • 1998
  • Feeding habits of Lateolabrax Japonicus collected from the eelgrass bed in Kwangyang Bay from January 1994 to December 1994 were studied. L. Japonicus was a carnivore which consumed mainly amphipods (gammarid amphipods and caprellid amphipods), crabs, caridean shrimps and copepods. Its diets included small quantities of fishes, mysids, polychaetes, tanaids and isopods. Three distinct ontogenetic feeding groups were noted : (1) 1~2 cm SL individuals preyed heavily on copepods. (2) 2~15 cm SL individuals preyed heavily on amphipods. (3) individuals over 15 cm SL preyed heavily on crabs, caridean shrimps and fishes. L. Japonicus showed seasonal changes in prey composition. These changes were not caused by seasonal changes in food availability, but by changes in the size composition of L. Japonicus occurred in the eelgrass bed.

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Feeding Habits of Conger myriaster in the Eelgrass (Zostera marina) Bed in Kwangyang Bay (광양만 잘피밭에 서식하는 붕장어 (Conger myriaster)의 식성)

  • HUH Sung-Hoi;KWAK Seok Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.5
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    • pp.665-672
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    • 1998
  • Feeding habits of Conger myiaster collected from the eelgrass bed in Kwangyang Bay from January 1994 to December 1994 were studied. C. myiaster was a carnivore which consumed mainly fishes, shrimps and crabs. Its diets included small quantities of amphipods, gastropods, cephalopods, polychaetes, mysids, cumaceans and isopods. It showed ontogenetic changes in feeding habits. Small indinviduals preyed on shrimps, fishes, crabs, and gammarid amphipods in nearly equal proportions. While the portion of the stomach contents attributable to shrimps and gammarid amphipods decreased with increasing fish size, consumption of fishes increased progressively. C. myiaster showed very constant prey selection regardless of prey availability-Especially fishes were heavily selected by this species throughout the year, although availability of fishes was lower than any other prey organisms in the eelgrass bed.

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Winter Zonation of the Benthic Amphipods in the Sandy Shore Surf Zone of Dolsando, Southern Korea (돌산도 모래해안 쇄파대에 사는 저서성 단각류의 겨울철 대상분포)

  • SUH Hae-Lip;Yu Ok-Hwan
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.3
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    • pp.340-348
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    • 1997
  • Sledge net samples were taken over the neap and spring tide cycles in January 1993 from the bottom and surface of 1 m depth and at the water's edge in the sandy shore surf zone of Dolsando, southern Korea. Zonation pattern of three dominant gammarid amphipods was compared. The amphipods were more abundant on the bottom and at water's edge than in the surface. Average densities at both sites of Pontogeneia rostrata and Allorchestes angusta were higher during the neap tide than the spring tide, whereas that of Synchelidium lenorostralum was lower during the neap tide. P. rostrata migrated horizontally during the flooding and ebbing tides, but S. lenorostralum and A. angusta did not. Unlike other species, P. rostrata was significantly more abundant at night, suggesting its active nocturnal movement. During flooding tide, P. rostrata was not found on the shore above the mean sea level (MSL) during daytime, but found in 100 cm above MSL at night. Zonal distribution of P. rostrata which was restricted from MSL to 250 cm below MSL, however, did not vary with the day-night cycle during ebbing tide. S. lenorostralum and A. angusta were not found during flooding tide but ebbing tide. The upper distribution limit of the former was 150 cm below MSL, and the distribution of the latter ranged from MSL to 150 cm below MSL. The highest densities of P. rostrata, S. lenorostralum and A. angusta were 32, 26 and 3 ind. $m^{-2}$, respectively. We discussed the relationships between the distribution pattern of three dominant species of gammarid amphipods and their life styles in the sandy shore.

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Feeding Habits of Sebastes inermis in the Eelgrass (Zostera marina) Bed in Kwangyang Bay (광양만 잘피밭에 서식하는 볼낙(Sebastes inermis)의 식성)

  • HUH Sung-Hoi;KWAK Seok Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.2
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    • pp.168-175
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    • 1998
  • Feeding habits of Sebastes inermis collected from the eelgrass bed in Kwangyang Bay from January 1994 to December 1994 were studied. S. inermis ($1\~9\;cm\;SL$) was a carnivore which mainly consumed amphipods (gammarid amphipods and caprellid amphipods) and copepods. Its diets included small quantities of caridean shrimps, crabs, gastropods, and fishes. It showed ontogenetic changes in feeding habits. In an initial stage, copepods were major food organisms. However, amphipods were heavily selected as the body size of S. inermis increases. Although consumption of copepods increased during spring, amphipods were major prey organisms for all seasons.

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