• 한국수산과학회지
• /
• 제43권6호
• /
• pp.679-686
• /
• 2010

To investigate the contribution of macroalgae to biogeochemical nutrients and carbon cycles, we measured the uptake rates of nutrients and $CO_2$ by Undaria pinnatifida using an incubation method in an acrylic chamber. From January to March 2010, U. pinnatifida was sampled at Ilkwang, a well-known area of macroalgae culture in Korea. The initial and final concentrations of nutrients, dissolved oxygen, total alkalinity, and pH of the chamber water were measured, and production/uptake rates were calculated using concentration changes, chamber volume, and incubation time. The production rate of dissolved oxygen by U. pinnatifida (n = 32) was about $5.4{\pm}4.0\;{\mu}mol\;g_{fw}^{-1\;}h^{-1}$. The uptake rate of total dissolved inorganic carbon (TDIC), calculated by total alkalinity and pH, was $7.9{\pm}6.5\;{\mu}mol\;g_{fw}^{-1}\;h^{-1}$. Nutrients uptake averaged $141.7{\pm}119.2$ nmol N $g_{fw}^{-1}\;h^{-1}$ and $15.0{\pm}9.1$ nmol P $g_{fw}^{-1}\;h^{-1}$. A positive linear correlation ($r^2$ = 9.6) existed between the production rate of dissolved oxygen and the uptake rate of total dissolved inorganic carbon, suggesting that these two factors serve as good indicators of U. pinnatifida photosynthesis. The relationships between fresh weight and uptake rates of nutrients and $CO_2$ suggested that younger specimens (<~50 g fresh weight) are much more efficient at nutrients and $CO_2$ uptake than are specimens >50 g. The amount of carbon uptake by the total biomass of U. pinnatifida in Korea during the year of 2008 was about 0.001-0.002% of global ocean carbon uptake. Thus, more research should be focused on macroalgae-based biogeochemical cycles to evaluate the roles and contributions of macroalgae to the global carbon cycle.

• 한국수산과학회지
• /
• 제32권3호
• /
• pp.284-289
• /
• 1999

수온, 먹이 및 shelter가 참전복에 미치는 효과를 조사하기 위하여 먹이종류 (배합사료, 미역)$\times$shelter 형태 (4종류)$\times$사육수온-(자연수, 가온수)$\times$2반복으로 평균체중 142mg인 참전복을 대상으로 15주간 사육 실험하였다. 생존율은 먹이종류와 사육수온에 따라 차이를 보여 자연수의 미역 공급구들이 대체로 낮은 경향을 보였다 (P<0.05). 증체율은 동일 수온에서 shelter 종류에 관계없이 배합사료 공급구가 현저히 높았으며 (P<0.05), 동일 먹이 공급구내에서는 가온수가 자연수보다 높았는데 특히 배합사료 공급구에서 이러한 차이는 더 현저하였다 (P<0.05). 실험 종료시 가식부의 수분 함량은 먹이와 수온에 따라서는 차이를 보였으나 shelter 종류에 따라서는 차이가 없었다. 단백질 함량은 실험구간에 유의한 차이가 없었으며 (P>0.05), 지질 함량은 자연수에 배합사료 공급구가 미역 공급구보다 전반적으로 높은 경향을 보였다 (P<0.05). 본 실험의 결과로부터 저수온기에 적당히 수온을 상승시킴과 동시에 해조류보다 배합사료를 공급하는 것이 사용 shelter 형태에 관계없이 참전복의 성장을 개선시키고 생존율을 높일 수 있을 것으로 판단된다.

• Journal of Plant Biology
• /
• 제38권2호
• /
• pp.153-158
• /
• 1995

Community structure of subtidal macroalgae was investigated at 3 sites of Neobdo Island in August 1994. In total, 66 taxa of red, 21 brown, 14 green, and 2 blue-green algae were identified. The number of species and biomass decreased with increasing depths. Gelidium amansii, Ulva pertusa, Dictyota dichotoma, Sargassum thunbergii, Undaria pinnatifida, Ecklonia cava, and Sargassum horneri had higher frequency and biomass. The vegetation of deeper zone was composed mainly of a few red algae. Substrate characteristic and light intensity were considered as environmental factors determining the underwater vegetation.

• 한국환경과학회지
• /
• 제24권10호
• /
• pp.1285-1307
• /
• 2015

We constructed marine forest to restore barren grounds which are expanding in the east coast of Korea using 2 methods of (1)seedlings transplantation method and (2)underwater floating ropes method. We transplanted 3 macroalgae species, Ecklonia cava, Undaria pinnatifida, and Saccharina. japonica to construct marine forest. Blade length of Undaria pinnatifida on underwater floating ropes was $56.70{\pm}8.69mm$ in April and grew $68.75{\pm}22.30mm$ in May and $70.75{\pm}14.36mm$ in July. Blade length of S. japonica was shown 97.95-143.00mm in April to June. Blade length of Ecklonia cava was $30.50{\pm}1.91mm$ in May, $41.55{\pm}1.84mm$ in August, $45.30{\pm}2.57mm$ in November, 2009 and $45.30{\pm}1.99mm$ in February, 2010. The survey on Dangsa area, Ulsan-city in January, 2009 found a total number of 15 algal species(1 brown algae, 14 red algae species) with the highest variety at 5m depth of A station and the lowest at 8m depth of A and B stations. The March survey showed a total of 24 species (1 green algae, 1 brown algae, 22 red algae species) with the highest variety of 11 at depths of 3m and 5m of B station and the lowest of 6 at 10m of B station. In May, total biomass was 3,755.4g (green algae 1.2g, brown algae 199.0g, red algae 3,555.2g). From January, 2009, we found that E. cava was dominant at the depths of 3m and 5m of A and B stations while Peyssonnelia capensis was dominant at the depth of 8m of A station. The 8m depth of B station was dominated by Acrosorium polyneurum. In May, Grateloupia lanceolata was dominant at 8m depth of A station while other depths were dominated by Phycodrys fimbriata. In June, the dominant species were G. lanceolata at the 3m depth, E. cava at the 5m and P. fimbriata at the depths of 8m and 10m of A station. Under B station, G. lanceolata was dominant at the depths of 3m and 5m while P. fimbriata was dominant at the depths of 8m and 10m.

• 한국양식학회지
• /
• 제1권2호
• /
• pp.121-133
• /
• 1988

고가의 식품으로 이용되는 말똥성게의 생식소의 소비가 증가됨에 따라 연안의 말똥성게 자원은 계속 감소하고 있어 이 종류에 대한 양식 기술개발은 중요한 연구 과제이다. 따라서 본 연구는 말똥성게를 실내에서 양식할 경우 먹이로서 신선한 해조류를 대치할 수 있는 육상식물을 조사하였다. 해조류 6종류 (미역, 구멍갈파래, 지충이, 개지누아리, 모자반, 곰피), 육상식물 5종류 (시금치, 상치, 무우잎, 배추, 케일), 동물성 먹이 2종류 (바지락. 쇠고기)를 대상으로 말똥성게의 선택적 및 비선택적 식성과 영양 효과를 비교한 결과, 말똥성게의 먹이로서 육상 식물의 이용이 가능하였다. 미역을 공급한 경우 말똥성게의 체중의 성장은 가장 높았으나 생식소지수는 시금치, 무우잎 또는 상치를 공급할 경우가 미역의 경우보다 더 높았다. 시금치와 무우잎의 공급은 생식소가 성장하는 계절에 적합하고, 각이 성장하는 시기에는 상치 또는 배추가 효과적일 것으로 판단된다. 특히 무우잎은 식용으로 이용하지 않고 버려지므로 무우잎을 이용한 말똥성게의 양식은 매우 경제적일 것이다.

• Fisheries and Aquatic Sciences
• /
• 제21권9호
• /
• pp.26.1-26.8
• /
• 2018

Inclusion effect of soybean meal (SBM) and fermented SBM (FSM) in extruded pellet for juvenile abalone (Haliotis discus) was compared in abalone farm. Dietary inclusion effect of the combined macroalgae (MA) (Undaria pinnatifida and Hizikia fusiforme) and a single Saccharina japonica on abalone was also compared. Three thousand six hundred juvenile abalone were purchased from a private hatchery and acclimated to the experimental conditions for 2 weeks. Six 5-ton flow-through raceway tanks were used, and abalone were randomly distributed into tanks (n = 600 per tank). Three experimental diets were prepared in duplicate. Fish meal, FSM, corn gluten meal, and shrimp meal and wheat flour and dextrin were used as the protein and carbohydrate sources, respectively, in the FSM diet. MA was also included in the FSM diet. FSM and MA in the FSM diet were substituted with SBM at the expense of wheat flour and S. japonica, referred to as the SBM and SJ diets. The experimental diets were pelletized by an extruded pelleter. Water stability of nutrients in the experimental diets was monitored at 12, 24, and 48 h after seawater immersion. The experimental diets were fed to abalone once a day to satiation with a little leftover for 120 days. The retained crude protein and lipid and ash content of the extruded pellets were changed over all period of time. Weight gain and specific growth rate (SGR) of abalone fed the SBM diet were greater than those of abalone fed the FSM and SJ diets. Weight gain and SGR of abalone fed the SJ diet were also greater than those of abalone fed the FSM diet. The longest shell length, widest shell width, highest shell height, and greatest soft body weight were obtained in abalone fed the SBM diet, followed by the SJ and FSM diets. Proximates of the soft body of abalone were not different among the experimental diets. In conclusion, SBM was a superior protein source to FSM in extruded pellet for growth performance of abalone. Dietary inclusion of a single S. japonica was superior to the combined inclusion of U. pinnatifida and H. fusiforme in the production of abalone.

• 현장농수산연구지
• /
• 제22권2호
• /
• pp.69-79
• /
• 2020

본 연구에서는 해조류 자원의 산업적 활용 소재로서의 가치 및 기능성 식품 및 사료 첨가 소재로의 개발을 위한 기초 자료를 제시하고자 국내에 서식하는 10종의 해조류 열수추출물을 이용하여 항염증 활성 및 마우스 대식세포주와 어류 세포주의 세포생존율에 미치는 영향을 확인하였다. 그 결과 S. japonica 100, 1000 ㎍/mL과 G. tenax 1000 ㎍/mL 농도에서 마우스 대식세포주를 LPS로 자극하였을 때 생성되는 NO를 유의적으로 감소시키는 것을 관찰하였으며, 나머지 8종의 해조류 추출물은 실험 농도에서 LPS에 의한 NO 생성에 영향을 미치지 않았다. 고농도에서 항염증 활성을 보인 S. japonica 및 G. tenax 열수추출물은 염증 인자를 조절할 수 있는 기능성 후보 소재로서 분획별 생리활성과 유효성분 규명의 연구가 요구된다. 본 연구 대상 해조류 추출물에 대한 안전성 기초 자료로서 마우스 대식세포 및 넙치 배아 유래 세포 세포생존율에 미치는 영향을 평가한 결과, P. tenera 고농도 (1000 ㎍/mL) 처리군을 제외하고 모든 해조류 추출물은 마우스 대식세포의 생존율에 영향을 주지 않았으며, 모든 해조류 추출물에서 5000 ㎍/mL까지 넙치 배아유래 세포에 대한 세포독성이 나타나지 않았다. 본 연구 결과는 후속 연구를 통해 해조류의 다양하고 복잡한 구조의 생물 활성 화합물의 생체 내 메커니즘을 규명함으로써 기능성 소재 개발을 위한 기초자로료 활용될 수 있을 것으로 기대하며, 본 연구의 대상 10종의 국내 해조류 자원 중 S. japonica과 G. tenax은 잠재적인 천연 항염증제로서 안전한 식품 및 사료 첨가 소재로서의 가능성을 제시한다.

• 한국수산과학회지
• /
• 제56권5호
• /
• pp.691-700
• /
• 2023

This study examined the seasonal variations of subtidal marine algal community structures along four sites in Jejudo Island, Korea, from February 2016 to November 2018. A total of 147 marine algal species were identified, including 13 green (8.84%), 26 brown (17.69%), and 108 red algae (73.47%). During the study period, the number of species was highest in Sagye (116 species) followed by numbers in Sinheung (98 species), Bukchon (90 species) and Sinchang (73 species). Ecklonia cava, Peyssonnelia caulifera, Synarthrophyton chejuense, Corallina aberrans and Corallina crassisima occurred at all study sites and in all seasons. The average annual biomass of marine algal flora was 746.29±88.85 g wet wt./m² and ranged from 652.25 g/m² at Sinheung to 979.91 g/m² at Sagye. The brown alga E. cava was the most dominant species, occupying 42.85% (319.80 g/m²) of the total seaweed biomass. Subdominant species were C. crassissima and Undaria pinnatifida, comprising 10.22% (76.29 g/m²) and 9.66% (72.13 g/m²), respectively. A similarity analysis showed that there were regional differences in the algal communities, with three distinct groups.