• 한국발생생물학회지:발생과생식
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• 제13권1호
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• pp.35-41
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• 2009

겨울철 사육조건이 양식산 뱀장어 Anguilla japonica의 인위적인 성성숙 유도 및 번식에 미치는 영향을 조사하였다. 봄철 salmon pituitary extracts(SPE)을 이용하여 성성숙 유도 예정인 양식산 암컷 뱀장어 친어를 8주의 겨울철 사육기간 동안, 4개의 사육환경(해수저온, $10^{\circ}C$; 해수고온, $20^{\circ}C$; 담수저온, $10^{\circ}C$; 담수고온, $20^{\circ}C$)에 각각 순치하여 사육하였다. 그 후 각각의 실험구의 뱀장어를 해수 $20^{\circ}C$로 이동하여 SPE를 매주 1회 8주 동안 복강 주사하였다. 그 결과, 생식소증량지수(GSI)와 성호르몬(E2)의 농도가 해수 실험구에서 유의적으로 증가하였으며, 특히 해수저온 실험구에서 가장 높은 값을 나타냈었다. 번식률 또한 해수저온 실험구에서 가장 높게 나타났다. 이러한 결과는 겨울철 사육환경이 봄철의 성성숙 유도에 효과적인 것으로 추측되며, 양식산 뱀장어의 성성숙 유도와 부화율 향상을 위한 기초자료로 유용할 것으로 사료된다.

• 수산해양교육연구
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• 제28권5호
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• pp.1444-1458
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• 2016

The expansion of high-density aquaculture in the limited waters has caused a wide variety of problems. The problems include environmental problems nearby aquaculture sites, growth rate of aquatic organisms, quality decline of farmed fish and price fall in the market. The phenomenon of aquaculture industry happens in not only inshore but also offshore. Therefore, the fisheries authorities have been changing their policy paradigms from mass production to sustainable production based on ecosystem. Other countries, however, focusing on relieving poverty and providing protein from fish production have not recognized the degree of seriousness. When it comes to enhancing the problems, National Institute of Fisheries Science has been developing the technology of Integrated Multi-Trophic Aquaculture (IMTA) to reduce and to prevent contaminants from fish and aquaculture sites, remained feed from fish farming process. In long-terms of view, the system is one of the most sustainable fishery production methods based on ecosystem. As integration of nutrient feed system from aquatic organisms is firmly established, the earlier mentioned problems will be diminished gradually. In term of the substantiality, this study was conducted. The research on management system for IMTA also has been incorporated. This study also investigated the features and current status of IMTA and demonstrated the developed management system and direction for the future advancement.

• 수산해양교육연구
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• 제21권3호
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• pp.335-346
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• 2009

Offshore-aquaculture is a new idea, has emerged as an alternative method, which can minimize the damage to the natural disaster due to the environment pollution by the fish farming activities in the coast and overcome the problems of vicious cycle in fish farming management. On the other hand, as the current fish farming laws and institutions focus on the support for offshore-aquaculture, having the limit to revitalizing and supporting the fish farming business in the open sea, it is necessary to amend the laws and institutions related to fish farm. We should be establish in connection with offshore-aquaculture, after the study aims at examining the foreign laws and institutions in such countries as USA and Norway, establishing the methods for the future laws and institutions of open sea fish farm through the analysis of the issues and controversies in the process of enactment in Korea.

• 한국수산과학회지
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• 제42권6호
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• pp.621-627
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• 2009

In order to standardize the juvenile abalone rearing technique, we selected sample farms by region in East, West and South coasts of Korea and Jeju island. We also have reviewed previous literature and visited farms to survey on the management of abalone juvenile production, spawning, hatching and so forth. Results of investigation are as follows: The light colors of tanks for larvae breeding are good for a frequent examination of larvae behaviour changes during the breeding period. The tank for the abalone juvenile production is a rectangular form in general and its size should amount to 3.5 m in length and 1.2 m width. It also should be built with proper drainage. The best age and size of adult for juvenile production are 3-6 years old individuals, with 9-12 cm separate burial and 125-150 g average weight. To induce spawning, the use of the exposure on air and ultraviolet ray together was the most effective. The density of larvae by plate should be 150-300 individuals and the proper stocking density was est imated and amount to 10-30 individuals. It has been shown that a correlation between water surface size($X_1$) and number of plates ($Y_1$), when producing abalone juveniles, is quite high and it is described by equation $Y_1=138.88X_1-5,736.8\;(R^2=0.9028)$. In addition, it has also been shown that a correlation between production of abalone juveniles ($Y_2$) and number of plates ($X_2$) is high and it is described by equation $Y_2=4.554X_2+12,493\;(R^2=0.8818)$. In Jindo region where a mass production of juveniles abalone has been done, it was shown, that a correlation between rearing water surface size ($X_3$) and production of juveniles abalone ($Y_3$) is very high and this relationship was described by the equation $Y_3=747.03X_2+94,359(R^2=0.9809)$. It has also been shown that a correlation between water surface size ($X_4$) and production of abalone juveniles ($Y_4$) in nationwide is high and the relationship between this variables was described by equation $Y_4=635.85X_4+99,923\;(R^2=0.9020)$.

• 한국발생생물학회지:발생과생식
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• 제16권2호
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• pp.77-85
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• 2012

담수에서 사육한 감성돔 Acanthopagrus schlegeli(담수감성돔) 냉동/해동 정자의 생존율이 가장 높았던 결빙억제제(cryprotective agent, CPA)는 dimethyl sulfoxide(DMSO)였으며, 다음으로 glycerol, ethylene glycol(EG) 그리고 methanol 순이었다. 해동 후 정자운동성은 glycerol, DMSO, EG, methanol 순으로 높았으며, 이상의 결과들은 해수에서 사육한 감성돔(해수감성돔)에서도 나타났다. 담수 및 해수감성돔 정자의 냉동보존시 적정 CPA는 DMSO와 glycerol이었으며, 생존율과 정자운동성이 가장 높았던 적정 농도는 모두 10%였다. 특히 10% DMSO로 냉동보존한 담수 및 해수감성돔 해동정자의 생존율과 정자운동성은 10% glycerol로 냉동보존한 해동정자보다 높게 나타났다. 냉동보존기간에 따른 담수 및 해수감성돔 해동정자의 생존율과 정자운동성을 측정한 결과, 대부분 보존기간이 길어질수록 감소하였으며, CPA의 농도가 높을수록 생존율과 정자운동성은 급격히 감소하였다. 그러나 5% DMSO로 냉동보존한 해동정자의 생존율 및 정자운동성은 차이는 보이지 않았다.

• Asian-Australasian Journal of Animal Sciences
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• 제16권3호
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• pp.455-462
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• 2003

Biotechnological research and development are moving at a very fast rate. The subject has assumed greatest importance in recent years in the development of agriculture and human health. The science of biotechnology has endowed us with new tools and tremendous power to create novel genes and genotypes of plants, animals and fish. The application of biotechnology in the fisheries sector is a relatively recent practice. Nevertheless, it is a promising area to enhance fish production. The increased application of biotechnological tools can certainly revolutionise our fish farming besides its role in biodiversity conservation. The paper briefly reports the current progress and thrust areas in the use of synthetic hormones in fish breeding, production of monosex, uniparental and polyploid individuals, molecular biology and transgenesis, biotechnology in aquaculture nutrition and health management, gene banking and the marine natural products.

• 전자통신동향분석
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• 제38권3호
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• pp.29-37
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• 2023

With the increasing demand for seafood and technological advancement in aquaculture, the industry has continuously grown. On the other hand, digital twins have been actively applied to various industries. Aquaculture deals with live aquatic animals that are sensitive to growth environment management. Hence, applying a digital twin to smart aquaculture may lead to a substantial economic benefit because it enables the optimization of different variables. We analyze the status of digital twin development in agriculture. The services of the aquafarm digital twin are divided into 1) data management, 2) optimization, and 3) intelligence. Standardization related to the aquafarm digital twin is also discussed. Based on the analyses, the development stage of aquafarm digital twin is defined, and directions of technology development are suggested.

• 한국수산과학회지
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• 제54권6호
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• pp.1052-1057
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• 2021

The diet composition of common flying squid Todarodes pacificus was studied using 1,084 specimens collected through trawl and jigging from June 2018 to June 2020 in the East Sea of Korea. The mantle length (ML) of the collected individuals ranged from 13.6 to 31.1 cm. Todarodes pacificus is a carnivore. In the study area, T. pacificus was observed feeding mainly on fish and cephalopods, in addition to small quantities of crustaceans. The calculated trophic level value for T. pacificus was 4.10. Small individuals (ML, <18.0 cm) mainly fed on cephalopods, while intermediate (ML, 18.0-23.0 cm) and large (ML, ≥23.0 cm) individuals fed mainly on fish and occasionally on cephalopods. Overall, as the body size of T. pacificus increased, the mean weight of the consumed prey increased (one-way ANOVA, P<0.05).

• 한국발생생물학회지:발생과생식
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• 제16권3호
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• pp.177-183
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• 2012

This study attempts to propose the possibility of the sex reversal in Tegillarca granosa and Ruditapes philippinarum by confirming the changes in the sex ratio with the shell length (SL) in the same population level. For analysis of sex ratio with SL, 1500 individuals of T. granosa (SL 10.1-45.0 mm) and 712 individuals of R. philippinarum (SL 15.1-70.0 mm) were used. Sex was analyzed histologically. The average sex ratios (F:M) of T. granosa and R. philippinarum were 1:1.22 and 1:0.96, respectively. However, sex ratio was found to differ when the clams were divided into groups according to SL in 5.0 mm intervals. Both species displayed the tendency of increase in the proportion of female with increase in SL. In this study, changes in the sex ratio in accordance with the growth of T. granosa and R. philippinarum are determined to be indirect evidence that signifies their sex reversal.

• 한국수산과학회지
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• 제41권4호
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• pp.267-271
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• 2008

We experimentally determined the physico-chemical properties of seminal plasma as well as the sperm cryopreservation techniques of masou salmon, Oncorhynchus masou masou. Seminal plasma contained $18{\pm}1mmol/L$ potassium, $144{\pm}4mmol/L$ sodium, $116{\pm}3mmol/L$ chloride, $83.2{\pm}3.1mg/L$ calcium, $14.8{\pm}0.7mg/L$ magnesium, $45{\pm}9mg/L$ glucose, and $1.0{\pm}0.0g/L$ total protein. The osmolality and pH of seminal plasma were $287{\pm}7\;and\;7.7{\pm}0.1mmol/kg$, respectively, and the spermatocrit was $28{\pm}2$. The rate of embryonic survival at the eyed-stage and the hatching rate were highest in 10% methanol with 300 mM glucose. Compared to DMSO or glycerol, methanol served as a better cryoprotectant of masou salmon sperm.