Kie-Young Park

Effects of stocking density and shelter type on the growth and survival of pandalid shrimp (Pandalopsis japonica Balss, 1914) juveniles

In this study, we determined the optimal shelter type by comparisons of growth, survival and RNA/DNA ratio of Pandalopsis japonica juveniles after rearing for 1 month and examining the effects of some shelters. The shelters used were brush-type, coloured pompons, and vinyl blankets. Attachment of individuals was highest, 117.7 ± 9.29 shrimp/900 cm2, with brush-type shelters. In rearing experiments for 1 month with four shelters and two stocking densities, carapace length (4.44-4.48 mm), wet weight (119.1-126.9 mg/ind.) and RNA/DNA ratio (0.11-0.12) were not significantly different between the treatments. Survival was highest with the brush-type shelter, but values were not significantly related to stocking density. In conclusion, the shelter type most enhancing attachment to the substrate and survival was a brush-type shelter. Regarding stocking density, survival was higher with a lower stocking density (60 juveniles/900 cm2). Thus, the quantities of reared shrimp can be enhanced by introducing shelters in aquaculture tanks.

Energy Budgets of Pandalid Shrimp Pandalopsis japonica Larvae in the Different Larval Stages

【The energy budget of the larvae of pandalid shrimp, Pandalopsis japonica, reared in the laboratory from zoea to post-larva was investigated. Energy used during the growth of the shrimp larvae was calculated daily for feeding, growth, molting, and metabolism. The total energy used was 16.2 J for the entire larval stage. Molting energy loss was estimated at a total 1.03 J. Energy used for respiration was estimated at a total of 1.85 J. The intake energy by feeding reached a total of 77.69 J. The total sum of energies used by excretion and egestion was 58.61 J. Larvae assimilated 24.57% of ingested food and used 84.91% for somatic growth. The gross growth efficiency (

The Rotifer Brachionus calyciflorus and Water Flea Moina macrocopa as Alternative Foods for Production of the Fighting Fish Betta splendens

K_1

Effects of the Dietary Inclusion of Sea Mud on the Growth and Body Composition of Juvenile Sea Cucumbers Apostichopus japonicus

) was 22.19% for the entire larval stage, and the net growth efficiency (

Effects of lipid enrichment of Artemia nauplii for feeding of spiny lebbeid shrimp, Lebbeus groenlandicus (Fabricius, 1775), zoea larvae

K_2

Effects of Three Diets on the Larval Growth of Pandalid Shrimp Pandalopsis japonica

) was 90.31%. Maintenance costs were estimated at 9.69% of assimilated energy for the entire larval stage.】

Energy Budget of Spiny Lebbeid Shrimp Lebbeus groenlandicus Larvae

The purpose of this study was to determine how an ornamental fish, such as the fighting fish, Betta splendens would respond to the use of freshwater live-prey, such as rotifers Brachionus calyciflorus and water fleas Moina macrocopa. Ingested quantity, digestive velocity and somatic growth were compared between larvae fed a freshwater rotifer and those fed boiled yolk. Food efficiency and somatic growth were compared between larvae that were fed freshwater water fleas and those fed a micro-diet developed for flounder (, I-hwa Ltd.). The number of rotifers ingested by larvae reached a maximum of 191 per day. However, based on the number ingested per hour and the digestive velocity of consumed rotifers, the maximum ingestible and digestible number of rotifers was calculated to be 272 per day. A maximum of 67 individuals (mean, 49.8 individuals) could be completely digested within the 1-h period from 90 to 180 min after feeding. Somatic growth was enhanced in larvae that were fed rotifers compared to those fed boiled yolk. Larvae exhibited greater growth at rotifer densities of 30 and 40 per mL than at lower densities. Among the water-flea (M. macrocopa and Bosmina sp.) and micro-particle diets, feeding with M. macrocopa resulted in the greatest somatic growth of larvae during the water-flea feeding stage.

Growth and Energy Budgets of Greenling Hexagrammos otakii Larvae and Juveniles Reared on Different Diets and Temperatures

해삼(Apostichopus japonicus)은 우리나라를 비롯한 중국 및 일본 등에서 수요가 높은 종이며, 비교적 고가로 판매되고 있는 수산물이다. 중국은 해삼 양식을 위한 종묘 생산 및 양성 기술을 확립하여 세계 해삼 생산량의 대부분을 차지하고 있다. 국내 해 삼 생산량은 2014년에 2,148톤이었으며 대부분 어획 생산에 의 한 것이고(Statistics Korea, 2013), 해삼은 2004년부터 자원 회 복을 위한 방류 품종으로 지정되면서 종묘 생산 및 어린 해삼 생 산이 활성화 되고 있다. 특히, 해삼은 중국의 수요가 높아 수출 전망이 높은 양식 종이며, 국내에서도 해삼 양식을 시도하는 양 어가들이 증가하는 추세이다. 최근 국내 해삼 양식의 대부분은 종묘 생산 및 어린 해삼 육성 위주로 이루어지고 있다. 국내 사료 회사에서의 해삼 전용 배합사료 개발 및 생산은 미 비한 실정이며, 국내 해삼 양식장에서는 중국산 해삼 사료 사 용을 선호하여 해삼 사료의 대부분이 중국에서 수입되어 사용 되고 있다. 그러나 중국산 수입 사료는 국내에서 고가로 판매 되고 있어 외화 낭비 등의 문제점을 초래하고 있다. 따라서 국 내 해삼 양식 활성화를 위해서는 경제적인 해삼용 배합사료 개 발이 필수적이다. 해삼 양식용 사료 개발을 위한 연구로는 어 린 해삼의 단백질 및 지질과 같은 필수 영양소 요구량(Seo et al., 2008; Seo and Lee; 2010)과 사료원료 이용성(Seo et al., 2011a; 2011b)에 관한 연구들이 보고되어왔다. 해삼은 퇴적물식자(deposit-feed)로써 자연에서는 바다 퇴 적물 내 유기물 및 해조류 부식물 등을 섭취한다(Zhang et al., 1995). 이러한 식성을 감안하여 대부분의 해삼 양식장에서는 배합사료 내 펄 분말 첨가가 어린 해삼(Apostichopus japonicus)의 성장 및 체조성에 미치는 영향 김경덕*·배기민·한현섭·김강웅·이봉주·김성삼·박기영·권오남

FIRST CASE FOR A NATURAL FERTILIZED EGGS COLLECTION OF KOREAN DOMESTIC POLLOCK, Theragra chalcogramma IN INDOOR DEEP-SEA WATER TANK

This study was conducted to determine the optimum feed selection for the spiny lebbeid shrimp, Lebbeus groenlandicus , from zoea to megalopa larva. To the shrimp zoeae, untreated hatching Artemia meta-nauplii, or either of two kinds of enriched Artemia , were supplied as feed daily, in a concentration of 3 individuals/ml. Throughout the experimental trials, 17.6-18.1 days elapsed until reaching the megalopa larval stage. In the starving trials, no mortality was observed; the mortality values observed in the experimental trials, between 4.8 and 9.5% were considered low and not significantly different (P>0.05). Neither fatty nor amino acids varied significantly in the zoea I and II stages in either the feeding or starving trials. Highly unsaturated fatty acids and amino acids were significantly lower in the megalopa stage in the starving group, compared with the feeding groups (P<0.05). Therefore, feeding was proven not to have any effect in the zoea I and II larval stages. However, for the megalopa larval stage, a feed containing supplementary amino acids and fatty acids evoked a positive effect.

Mari-Culture and Production of Optimized Rainbow Trout for Sea Water Rearing

Larvae of pandalid shrimp Pandalopsis japonica are benthic, and may prefer bottom to planktonic food items. Three diets, enriched Artemia meta-nauplii (AR), clam meat (CM), and crumbled shrimp (CD), were evaluated as food for early larvae in terms of biometric growth R:D ratios. Larvae fed AR and CM had significantly greater total length and dry weight than did larvae fed CD (P<0.05). Survival was significantly greater in larvae fed CM than in those fed AR and CD (P<0.05). R:D ratios were also significantly higher in larvae fed AR and CM than in those fed CD (P<0.05). Planktonic Artemia meta-nauplii containing high levels of fatty acids and amino acids were not suitable for either normal somatic growth or survival at early benthic larval stages. Furthermore, it is necessary to determine the optimal feeding duration to increase digestibility of AD. Thus, we propose that clam meat is the best diet for pandalid shrimp larvae.