Development and growth in fertilized eggs and larvae of the Japanese geoduck, Panopea japonica reared in the laboratory

Abstract

The development of Japanese geoduck, Panopea japonica, grown under culture conditions, has been examined through the morphological characteristics in fertilized egg, larvae and juvenile. Gametes were stripped from ripe broodstock and placed into two separate containers. Eggs were washed through a 40 μm sieve and fertilized with dilute sperm solution. Developing larvae were maintained at 19 ± 1℃. Fertilized eggs with 81.6 μm diameter developed to trochophores within 14 h and to D-stage larvae (116 μm shell length) within 27 h. Larvae were spontaneously settled at shell length of 311 μm after 20 days. The hatching from fertilized eggs and larval rearing were normally available in 18.5-21.5℃, and the growth was good in a cashmilon substrate, as well as sand. After rearing of day 108 from metamorphosis, the shell length of juvenile P. japonica reached 13 mm, and growth rate of shell length of the juvenile was 117.5 μm/d.

Practical fertilization procedure and embryonic development of the New Zealand geoduck clam (Panopea zelandica)

“…These developmental periods were similar to those determined for P. japonica by Lee & Rho (1997), who incubated embryos at 14 and 17°C (Table 1). However, the incubation period for P. japonica embryos could be shortened to 27 h at 19°C (Nam et al , 2014). While it may be beneficial for geoduck hatcheries to maximize the developmental rate, the thermal threshold for normal development should not be exceeded (Santos & Nascimento, 1985).…”

Effect of Water Temperature Condition on Growth and Survival of Juvenile Geoduck (Panopea japonica A. Adams, 1850)

“…우럭목 (Myida) 족사부착쇄조개과 (Hiatellidae) 에 속하며, 일본 본토와 러시아 연해주, 사할린 쿠릴열도, 캄차카 연안 등 에 분포하고 우리나라에서는 동해 연안에서 출연하고 있다 (Nam et al, 2014). 코끼리조개는 잠입성 이매패류이며, 성 숙한 성체는 약 500g 내외로 크고 식용 가용부위가 55% 정도 로 많아서 상품가치가 높고 단백질이 풍부하여 양식 대상종으 로 개발 가치가 아주 큰 종이다 (You et al, 1993) (Fig 1).…”

Nitrite tolerance of larvae and juveniles of geoduck clam Panopea japonica

“…It is well distributed in China, Korea and Japan (Min, Lee, Koh & Je, 2004;Nam, Lee, Kim, Kim & Kim, 2014). It is well distributed in China, Korea and Japan (Min, Lee, Koh & Je, 2004;Nam, Lee, Kim, Kim & Kim, 2014).…”

“…Panopea japonica is one of the most commercially important cultured geoduck species. It is well distributed in China, Korea and Japan (Min, Lee, Koh & Je, 2004;Nam, Lee, Kim, Kim & Kim, 2014).…”

“…Panopea japonica is one of the most commercially important cultured geoduck species. It is well distributed in China, Korea and Japan (Min, Lee, Koh & Je, ; Nam, Lee, Kim, Kim & Kim, ). In recent years, aquaculture of P. japonica has grown rapidly, and has attracted considerable interest, due to its high demand and profitability (Huo et al., ).…”