• Title, Summary, Keyword: 바위털갯지렁이

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Effects of Rearing Conditions on the Artificial Seed Production of a Polychaete Marphysa sanguinea (바위털갯지렁이 Marphysa sanguinea의 인공종묘생산에 미치는 사육환경의 영향)

  • Kim, Chang-Hoon;Jang, Sung-Wook
    • Journal of Aquaculture
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    • v.21 no.1
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    • pp.34-40
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    • 2008
  • This study investigated the effect of rearing conditions on the spawning habit, juvenile growth and larvae development of Marphysa sanguinea, to develop techniques of its artificial seed production. M. sanguinea released trochophore larvae around the burrow when the water temperature was from $18^{\circ}C$ to $22^{\circ}C$. Larvae floated away after staying in the burrow for a while. Larvae secreted mucus eight days after release, covering their whole body with it, and developed ten somites 20 days after release. In preference of juveniles in different grain sizes of sediment, the highest survival rate was made in the grain substrate of $1{\sim}2$ mm in the mean diameter, but the lowest was in the $2{\sim}3$ mm grain substrate. Optimum growth was obtained at the rearing temperature of $24^{\circ}C$(SGR 1.10%), and it reached over $2{\sim}3$ times higher weight gain and specific growth rate than those reared at $21^{\circ}C(0.64),\;18^{\circ}C(0.56)$ and $15^{\circ}C$(0.42) for 50 days. Salinity also made a great difference in the growth and survival rate. The highest weight gain and growth rate were shown when the juveniles were reared at salinity 30 psu.

Environmental Characteristics on Larval Release of Rockworm Polychaete Marphysa sanguinea (바위털갯지렁이(Marphysa sanguinea) 유생 방출에 미치는 환경특성)

  • Kim, Kyeong-Hun;Vo, Thi Thu Em;Kim, Hong Jin;Kim, Chang-Hoon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.49 no.4
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    • pp.486-492
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    • 2016
  • This study investigates the relationship between environmental factors, such as semilunar rhythm and atmospheric pressure, and the release of Marphysa sanguinea larvae. During artificial seed production in a temperature-regulated culture system, there was an increase in the number of released larvae at tide times between 3-4 and 9-11. Numbers of larvae released were significantly correlated with tidal rhythms. Atmospheric pressure also appeared to influence larval release, with increased numbers released when a period of high atmospheric pressure followed a period of low pressure.

Effects of Substrate Sizes and Organic Contents on Larval Settlement and Growth in the Early Stage of the Polychaete Marphysa sanguinea (바위털갯지렁이(Marphysa sanguinea) 유생의 착저와 초기 성장에 미치는 기질 크기 및 유기물 함량)

  • Phoo, War War;Kim, Sung Kyun;Kim, Chang-Hoon
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.53 no.1
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    • pp.132-138
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    • 2020
  • Marphysa sanguinea is the most well-known polychaete species with a high economic value. However, this species has a high mortality in the early rearing stage of aquaculture. This study was conducted to find out the optimal substrate size and organic contents for the growth and survival rate of M. sanguinea larvae and juveniles. It was observed that the smaller grain size (<Ø 0.063 mm) and high organic contents (5-10%) induced settlement and reduced settlement time of larvae. Moreover, the growth and survival rate of larvae reached high levels at Ø 0.004-0.016 mm of grain sizes and 5-7.5% of organic contents as advantageous substrates for settlement. The survival rate of juveniles reached over 90% in less than Ø 0.016 mm substrate on 15-day experiment for different grain sizes of substrates. These results indicated that substrate compositions of less than Ø 0.016 mm of sand size and 5-7.5% of organic contents in mud will enhance the productivity of M. sanguinea at the early stage.