• Title/Summary/Keyword: gammarid amphipods

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Feeding Ecology of Sillago japonica in an Eelgrass (Zostera marina) Bed

  • Kwak Seok Nam;Baeck Gun Wook;Huh Sung-Hoi
    • Fisheries and Aquatic Sciences
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    • v.7 no.2
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    • pp.84-89
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    • 2004
  • Feeding habits of Sillago japonica collected from in an eelgrass (Zostera marina) bed in Jindong Bay, Korea were studied. S. japonica was a carnivore which consumed mainly gammarid amphipods, polychaetes, bivalves, caridean shrimps and crabs. Its diets also included a small amount of fishes, copepods and caprellid amphipods. The diet of S. japonica underwent significant size-related changes; small individuals (<5cm SL) fed mainly on gammarid amphipods and crab larvae, while proportion of polychaetes and bivalves increased with increasing fish size and gammarid amphipods were also important prey for medium size individuals (5.1-9.9cm SL). The large individuals (>10cm SL) ate polychaetes, caridean shrimps and crabs. The dietary breadth of S. japonica were varied with size. The diet of S. japonica also underwent seasonal changes that could be related to differences in prey availability; gammarid amphipods were mainly consumed in spring and polychaetes in summer.

Feeding habits of Favonigobius gymnauchen in the eelgrass (Zostera marina) bed in Kwangyang Bay (광양만 잘피밭에 서식하는 날개망둑 (Favonigobius gymnauchen)의 식성)

  • HUH Sung-Hoi;KWAK Seok Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.3
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    • pp.372-379
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    • 1998
  • Feeding habits of Favonigobius gymnauchen collected from the eelgrass bed in Kwangyang Bay from January 1994 to December 1994 were studied. Favonigobius gymnauchen was a carnivore which consumed mainly gammarid amphipods, polychaetes, crabs and copepods. Its diets included minor Quantities of gastropods, tanaids and isopods. It showed ontogenetic changes in feeding habits. Small individuals (1$\~$2 cm) fed mainly on gammarid amphipods, polychaetes, and copepods. While the portion of the stomach contents attributable to polychaetes and crabs increased steadily with incensing fish size, consumption of copepods decreased progressively. Gammarid amphipods were the most selected prey item for all size classes. Although gammarid amphipods, polychaetes, crabs and copepods were major prey organisms for all seasons, the relative proportion of these food items changed with season. Consumption of copepods was relatively high in spring and fall and consumption of gammarid amphipods, polychaetes and crabs was relatively high in summer.

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Feeding Habits of Syngnathus schlegeli in Eelgrass (Zostera marina) Bed in Kwangyang Bay (광양만 잘피밭에 서식하는 실고기 (Syngnathus schlegeli)의 식성)

  • HUH Sung-Hoi;KWAK Seok Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.30 no.5
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    • pp.896-902
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    • 1997
  • Feeding habits of Syngnathus schlegeli were studied by using samples collected from the eelgrass bed in Kwangyang Bay, Korea from January 1994 to December 1994. Syngnathus schlegeli was a carnivore which mainly consumed copepods and epiphytal gammarid amphipods. Its diets included small quantities of caprellid amphipods, tanaids and mysids. It showed ontogenetic changes in feeding habits. In its initial feeding stage, copepods were major food organisms. However, gammarid amphipods were heavily selected with the incretment of the fish size. Food availability in the eelgrass bed changed seasonally. Its main food items were changed according to variations of food availability. Copepods were mainly consumed in spring, and gammarid amphipods in summer and fall.

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Feeding Habits of Rudarius ercodes in a Zostera marina Bed

  • Kwak Seok Nam;Huh Sung-Hoi
    • Fisheries and Aquatic Sciences
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    • v.7 no.1
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    • pp.46-50
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    • 2004
  • Feeding habits of Rudarius ercodes collected from a Zostera marina bed in Jindong Bay, Korea were studied. R. ercodes was a omnivore which consumed mainly gammarid amphipods, polychaetes and eelgrass (z. marina). Its diets also included a small amount of copepods, urochordates and caprellid amphipods. R. ercodes showed ontogenetic changes in feeding habits. Small individuals less than 2cm SL fed mainly on copepods, however, gammarid amphipods and polychaetes were heavily selected with increasing fish size. The consumption of eelgrass by R. ercodes was $10-20\%$ all size classes. The dietary breadth of R. ercodes were varied with fish size

Feeding Habits of Acentrogobius pflaumii in the Eelgrass(Zostera marina) Bed in Kwangyang Bay (광양만 잘피밭에 서식하는 줄망둑(Acentrogobius pflaumii)의 식성)

  • Huh, Sung-Hoi;Kwak, Seok-Nam
    • Korean Journal of Ichthyology
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    • v.10 no.1
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    • pp.24-31
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    • 1998
  • Feeding habits of Acentrogobius pflaumii collected from the eelgrass bed in Kwangyang Bay from January 1994 to December 1994 were studied. Acentrogobius pflaumii was a carnivore which consumed mainly gammarid amphipods, polychaetes and gastropods. Its diets included minor quantities of cope pods, tanaids and crabs. It showed ontogenetic changes in feeding habits. Individuals of 1~2cm SL preyed heavily on gammarid amphipods. However, polychaetes and gastropods were selected with increasing fish size. Although gammarid amphipods, polychaetes, and gastropods were major prey organisms for all seasons, the relative proportion of these food items changed with season. Consumption of gammarid amphipods and polychaetes was relatively high in summer, and consumption of gastropods was relatively high in winter.

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Diel Changes in the Diet of Rudarius ercodes: A Diurnal Omnivore and Nocturnal Carnivore (그물코쥐치의 먹이습성의 일별 변화: 낮은 잡식성, 밤은 육식성)

  • Kwak, Seok Nam;Huh, Sung-Hoi;Choi, Chang Geun
    • Korean Journal of Ichthyology
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    • v.18 no.3
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    • pp.178-183
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    • 2006
  • Diel changes in the feeding habits of Rudarius ercodes were investigated in an eelgrass bed of Jindong Bay, Korea. The main food components for R. ercodes (1.6~ 4.3 cm SL) were gammarid amphipods, eelgrass, polychaetes and urochordates. Most dietary items were inhabitants of an eelgrass bed. Diel variations in diet and feeding activity occurred. The diet of R. ercodes underwent changes from eelgrass and gammarid amphipods (omnivore) at day to mainly gammarid amphipods, polychaetes, and urochordates (carnivore) at night. Rudarius ercodes probably took detached eelgrass leaves and grazed live eelgrass during day, whereas feeding on gammarid amphipods, polychaetes, urochordates, and bivalves were facilitated by nocturnal movement and activity of these prey during night. The feeding activity of R. ercodes was also correlated with periods of high tides.

Feeding Habits of Hippocampus mohnikei in an Eelgrass (Zostera marina) Bed (동대만 잘피밭에 서식하는 산호해마의 식성)

  • Kwak, Seok Nam;Huh, Sung-Hoi;Seung, Bong Jun
    • Korean Journal of Ichthyology
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    • v.20 no.2
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    • pp.112-116
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    • 2008
  • Feeding habits of Hippocampus mohnikei (4.1~10.4 cm SL) collected from an eelgrass bed in Dongdae Bay, Korea were studied. H. mohnikei was a carnivore fish which consumed mainly gammarid amphipods. Its diets also included a small amount of caprellid amphipods, tanaids, copepods, mysids, and eelgrass. Gammarid amphipods were the most important prey organisms to the diet of all size classes of H. mohnikei despite smaller H. mohnikei (<4.5 cm SL) fed copepods. H. mohnikei fed on larger sizes of prey as their size increased. The dietary breadth of H. mohnikei were decreased with increasing their size.

Feeding habits of Acanthogobius flavimanus in the eelgrass (Zostera marina) bed in Kwangyang Bay (광양만 잘피밭에 서식하는 문절망둑 (Acanthogobius flavimanus)의 식성)

  • HUH Sung-Hoi;KWAK Seok Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.32 no.1
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    • pp.10-17
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    • 1999
  • Feeding Habits of Acanthogobius flavimanus collected from the eelgrass bed in Kwangyang Bay from January to December 1994 were studied. A. flavimanus was a carnivore which consumed mainly polychaetes, crabs, shrimps, gammarid amphipods and fishes. Its diets included small quantities of ophiuroids, gastropods, bivalves, caprellid amphipods, isopods and tanaids. It showed ontogenetic changes in feeding habits. Small individuals fed mainly on polychaetes and amphipods. While the consumption of polychaetes and amphipods decreased with increasing fish sin, the consumption of shrimps, crabs and fishes increased. A. flavimanus fed diverse prey organisms in adult stage. The relative proportion of the major prey items changed with season. Although the consumption of polychaetes, shrimps and gammarid amphipods was relatively high in spring and autumn, A. flavimanus fed various prey organisms in nearly equal proportions in the other seasons.

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Feeding Habits of Trumpeter Whiting, Sillago maculata in the Tropical Seagrass Beds of Cockle Bay, Queensland (열대성 해초지에 서식하는 Sillago maculata의 식성)

  • Kwak, Seok-Nam;David, W. Klumpp;Huh, Sung-Hoi
    • Korean Journal of Ichthyology
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    • v.13 no.4
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    • pp.223-229
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    • 2001
  • Feeding habits of juvenile Sillago maculata, collected from the tropical seagrass beds in Cockle Bay, Queensland, were studied. S. maculata (0.5~9.5 cm SL) was a carnivore which consumed mainly gammarid amphipods, crabs and copepods. Its diets included small quantities of polychaetes, shrimps, fishes, isopods and cumacean. S. maculata showed ontogenetic changes in feeding habits. Small individuals preyed mainly on copepods, crab larvae and gammarid amphipods. While the portion of the stomach contents attributable to polychaetes, crabs and fishes increased with increasing fish size, consumption of copepods and crab larvae decreased progressively. Gammarid amphipods were the most selected prey item for all size classes.

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Feeding Habits of Juvenile TakifugU niphobles in the Eelgrass (Zostera marina) bed in Kwangyang Bay (광양만 잘피밭에 서식하는 복섬 (Takifug niphobles) 유어의 식성)

  • HUH Sung-Hoi;KWAK Seok Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.6
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    • pp.806-812
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    • 1998
  • Feeding habits of juvenile Takifug niphobles collected from the eelgrass bed in Kwangyang Bay were studied. T. niphobles (2$\~$8 cm SL) was a carnivore which consumed mainly amphipods (gammarid and caprellid amphipods), crabs, shrimps and gastropods. Its diets included minor quantities of polychaetes, copepods, tanaids and isopods. T. niphobles showed ontogenetic changes in feeding habits. Small individuals preyed mainly on gammarid amphipods, caprellid amphipods and gastropods. However, crabs and shrimps were heavily selected with increasing fish size.

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