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ISSN : 1225-3480

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29권 4호

실험실에서 사육된 고랑가리비 Chlamys swiftii 수정란 발생과 유생 성장

Development and growth in fertilized eggs and larvae of Korea swift's scallop Chlamys swiftii reared in the laboratory

이주 (국립수산과학원 동해수산연구소)
김이청 (국립수산과학원 동해수산연구소)
김기승 (국립수산과학원 동해수산연구소)
남명모 (국립수산과학원 동해수산연구소)
한국패류학회지 / The Korean Journal of Malacology, (P)1225-3480;
2013, v.29 no.4, pp.263-272
https://doi.org/10.9710/kjm.2013.29.4.263
이주, 김이청, 김기승, & 남명모. (2013). 실험실에서 사육된 고랑가리비 Chlamys swiftii 수정란 발생과 유생 성장. , 29(4), 263-272, https://doi.org/10.9710/kjm.2013.29.4.263

초록

고랑가리비의 산란을 유도하고 수정난의 발생과 유생의 성장과정을 조사하였다. 산란자극 방법으로 광 자극, 간출 자극, 온도 자극, 그리고 간출 후 온도자극을 수온 $16{\pm}0.5^{\circ}C$에서 각각 실시하였다. 광 자극은 암컷 1마리당 700-900천개, 온도 자극은 700-800천개로 적은 산란량을 보인 반면 간출 자극은 700-1,200천개로 높았으며 간출 자극 후 온도자극이 1,000-1,500천개로 가장 높은 산란량을 보였다. 수정율에 있어 광 자극은 암컷 1마리당 71.7%, 온도자극은 73.4%, 간출 자극이 73.6%이었으며 간출 자극 후 온도자극은 76.3%로 가장 높았으나 자극방법에 따른 수정율의 유의적인 차이는 없었다. 수정란부터 D상 유생으로의 수온별 발생과정을 조사하기 위하여 비이커에 ml당 1,000개의 수정란을 수용하고 각각 $8^{\circ}C$, $12^{\circ}C$, $16^{\circ}C$, $20^{\circ}C$ 및 $24^{\circ}C$에서 D상 유생으로 발생하는 생존율을 광학현미경을 사용하여 30분 간격으로 관찰한 결과, $8^{\circ}C$와 $24^{\circ}C$의 실험군이 4.1%와 3.2%로 생존율이 낮은 편이었으며 $16^{\circ}C$에서 32.7%로 가장 높은 생존율을 보여주었다. 수정란의 크기는 $72{\pm}2.1{\mu}m$, 담륜자 유생은 $103{\pm}3.8{\mu}m$, D상 유생은 $129{\pm}10.4{\mu}m$, 각정기 유생은 $145{\pm}16.8{\mu}m$, 후기 유생은 $197{\pm}13.6{\mu}m$이었으며 528시간 후에 각장 $245{\pm}15.8{\mu}m$의 초기 부착종묘로 성장하였다.

keywords
Scallop, Development, Growth, Fertilized egg, Larvae, Juvenile, Chlamys swiftii

Abstract

The development of swift's scallop Chlamys swiftii, reared in the laboratory, has been examined through the investigation of morphological characteristics in fertilized egg, larvae and juvenile. Eggs were fertilized with a dilute sperm solution to improve the survival of fertilized eggs. Developing larvae were maintained at a temperature of $16{\pm}0.5^{\circ}C$ and salinity concentration of 33 ppt. We have investigated the fertilization rates and egg number spawned at several stimulating conditions such as sunlight exposure, air dry, seawater temperature rise ($5^{\circ}C$) and seawater temperature rise ($5^{\circ}C$) after exposure of air dry for spawning induction of swift's scallop Chamys swiftii. Stimulation treated with sunlight exposure and seawater temperature rise ($5^{\circ}C$) have shown the spawning number of 700,000-900,000 and 700,000-800,000 per individual, respectively while stimulation treated with seawater temperature rise ($5^{\circ}C$) after exposure of air dry have shown the high spawning number of 1,000,000-1,500,000 per individual. Survival rate of D-shaped larvae of swift's scallop put into the different seawater temperatures of $8^{\circ}C$, $12^{\circ}C$, $16^{\circ}C$, $20^{\circ}C$ and $24^{\circ}C$ has been 4.1%, 11.6%, 32.7%, 18.6% and 3.2%, respectively. Fertilized eggs with the diameter of $72{\mu}m$ developed into trochophore larvae of $103{\pm}3.8{\mu}m$ shortly after 35 hours and to D larvae of $129{\pm}10.4{\mu}m$ shell length within 72 hours. It took 336 hours to become initial Umbo-stage larva of $145{\pm}16.8{\mu}m$ shell length. Post larvae, which have been $197{\pm}13.6{\mu}m$ shell length, spontaneously have settled in the attachment substances. It have required 528 hours from fertilized eggs to early attached juvenile to become initial juvenile size of $245{\pm}15.8{\mu}m$ shell length.

keywords
Scallop, Development, Growth, Fertilized egg, Larvae, Juvenile, Chlamys swiftii

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