Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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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

  • Published : 2008.02.25
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Abstract

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.

갯지렁이류 중 산업적으로 가치가 높은 바위털갯지렁이 Marphysa sanguinea의 인공종묘생산 기술 개발을 위하여 산란습성, 유생발달 및 치충의 성장에 미치는 사육환경의 영향을 조사하였다. 바위털갯지렁이는 수온 $18^{\circ}C{\sim}22^{\circ}C$에 서식공 주변으로 담륜자(trochophore) 시기의 유생을 방출하였고, 방출된 유생은 서식공 주변에 잠시 머무른 후 수조 전체로 퍼져나가는 것이 관찰되었다. 서식공에서 방출된 유생은 8일이 지나면 개구하면서 점액질이 분비되어 몸 전체를 둘러싸는 것이 관찰되었고, 방출 후 20일이 지나면 10체절을 형성하였다. 시판용 모래의 입도별 선택성을 조사한 결과 생존율은 ${\phi}1{\sim}2mm$인 실험구에서 가장 높았고, ${\phi}2{\sim}3mm$ 실험구에서 가장 낮게 나타났다. 수온에 따른 치충의 성장은 $24^{\circ}C$ 실험구의 성장이 가장 좋았고, 50일간의 실험기간동안 이 실험구의 일간성장률은 1.1%을 나타내어 $21^{\circ}C,\;18^{\circ}C$ 및 $15^{\circ}C$구보다 2-3배가 높은 체중과 일간 성장률을 보였다. 염분 또한 치충의 성장과 생존율에 큰 영향을 주었으며, 30 psu 조건에서 가장 높은 증중 및 성장률을 보였다.

Keywords

References

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