• Title, Summary, Keyword: 섭이

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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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절식에 따른 참전복, Haliotis discus hannai 소화기관의 조직학적 변화

  • 강승완;이제봉;이정식
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.205-206
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    • 2002
  • 수서동물은 육상동물과 마찬가지로 섭이 후 소화와 흡수 과정을 통하여 생존 및 대사에 필요한 에너지원을 얻게 되므로 섭이는 생물의 활동에서 매우 중요한 부분이다. 동물들은 다양한 환경 조건에 따라 절식상태에 처하는 경우가 생기게 되고 절식시 이들은 행동, 생리 및 생화학적 방법으로 이러한 어려움을 극복하고자 노력하는데 이 때에는 생체내에 축적된 에너지원을 이용하게 된다 (Weatherley and Gill, 1987). (중략)

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Feeding Habits of Pseudoblennius cottoides (가시망둑 (Pseudoblennius cottoides)의 식성)

  • HUH Sung-Hoi;KWAK Seok Nam
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.1
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    • pp.37-44
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    • 1998
  • Feeding habits of Pseudoblennius cottoides collected from the eelgrass bed in Kwangyang Bay from January 1994 to December 1994 were studied. Pseudoblennius cottoides was a carnivore which mainly consumed fishes, caridean shrimps, and amphipods. Its diets included small Quantities of tanaids, copepods, isopods, mysids, and polychaetes. It showed ontogenetic changes in feeding habits. Fishes were heavily selected as the body size of P. cottoides increases. Fishes and caridean shrimps were major prey organisms for all seasons.

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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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Studies on Feeding and Growth of the Oriental Brown Shrimp, Penaeus japonicus Bate (보리새우의 섭이와 성장)

  • CHOE Sang
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.3 no.3
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    • pp.161-171
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    • 1970
  • 1. The higher the temperature of the sea water, and the smaller the size of the oriental brown shrimp, the higher the feeding rate of the shrimp will be as long as the temperature ranges from $19^{\circ}\;to\;30^{\circ}C$, and each shrimp weighs from 1.6 to 14.9 grams. The average daily feeding rate is between 18 to 44 percent. 2. The nighttime feeding rate is always higher than the daytime feeding rate. However, the daytime feeding rate can be raised to from 22 to 37 percent of the daily feeding rate iii the non-sediment, dark or direct-sunshine-shielded conditions. Growth can thus be accelerated to that extent under such conditions. 3. When anchovy and short-necked clam meats were simultaneously used as food, a greater quantity of anchovy meat was consumed than short-necked clam meat both during the daytime and nighttime. When anchovy and short-necked clam meats were simultaneously given, the averaged daily feeding rates of anchovy and short-necked clam meats were 12.9 percent and 10.3 percent, respectively. 4. The following equation applies to the relationship between the freight of the oriental brown shrimp (W in grams) and their daily growth rate (DGR in percent): log DGR=0.7035-0.7864 log W. The daily growth rate is in inverse proportion to the size of the shrimp. 5. The efficiency of food conversion of the oriental brown shrimp fluctuates between 2.8 and 7.8 percent without extensive difference depending on the size of the shrimp. This was very small as compared with the corresponding figures so far known for fish and cuttlefish.

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Studies on the Fishery Biology of Pomfrets, Pampus spp., in the Korean Waters 4. Food of Pampus echinogaster (한국 근해 병어류의 자원 생물학적 연구 4. 덕대(Pampus echinogaster)의 식성)

  • HUH Sung Hoi
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.22 no.5
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    • pp.291-293
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    • 1989
  • Pampus echinogaster was a carnivore and its major food items were crustaceans, hydromedusae, salps, Sagitta, and fish. Larvae and small juveniles preyed heavily on copepods. However, the portion of the diet attributable to copepods was decreased with increasing size, and this decrease was paralleled by an increased consumption of hydromedusae, salps, Sagitta, and fish.

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A Study on the Monitoring System for Ocean Fish Farm (해상 가두리 양식장 암모니아 모니터링 시스템에 관한 연구)

  • Oh, Jin-Seok
    • Journal of Navigation and Port Research
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    • v.30 no.8
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    • pp.721-727
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    • 2006
  • Ammoniac nitrogen excretion is not able to be removed in ocean fish farm. It is the reason for fish being dead in large quantities or declining feeding activity that ammoniac nitrogen is not removed efficiently in ocean fish farm. Because of declining with feeding activity, it is true that feed is wasted for the present. To solve this problem, NH3, one of environment factors in ocean fish farm, monitoring system is suggested to be formed in this paper.

Studies about New Observation and Counting Method for Analysis of First Feeding Day and Daily Feeding Numbers of Rotifer by Marine Fish Larvae (해산어류 자어의 초기 먹이생물인 로티퍼의 최초 섭이 일령과 포식 수 분석을 위한 새로운 관찰 및 계수 방법)

  • Jung Min-Min;Wi Chong-Hwan;Ji Young-Ju;Min Kwang-Sik
    • Journal of Aquaculture
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    • v.19 no.3
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    • pp.178-182
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    • 2006
  • We studied new observation method about take process of rotifer by marine fish larvae. Till now, we can not accurate observation and count of first rotifer feeding day and/or feeding numbers of rotifer by marine fish larvae. Because take rotifer is ingested and disappeared in the digestive system of fish larvae. However we suggest possible observation method for these problems. The trophi is mastication organ of rotifer, and has only one in each rotifer individual. The trophi is left in the mastication organ because sole indigestible organ of rotifer. Therefore we can accurate observation and count of first rotifer feeding day and/or feeding rotifer numbers of marine fish larvae by trophi observation method (RTCM; Rotifer Trophi Counting Method).