[논문]Study on Growth Characteristics of Sargassum fulvellum in the Integrated Multi-trophic Aquaculture (IMTA) System

Kim, Young-Dae; Park, Mi-Seon; Min, Byung-Hwa; Jeong, Seong-Jae; Kim, Hyung-Chul; Yoo, Hyun-Il; Lee, Won-Chan; Choi, Jae-Suk

doi:10.5322/jesi.2014.23.10.1703

Study on Growth Characteristics of Sargassum fulvellum in the Integrated Multi-trophic Aquaculture (IMTA) System 원문보기

Journal of environmental science international = 한국환경과학회지, v.23 no.10, 2014년, pp.1703 - 1718

Kim, Young-Dae (Aquaculture Industry Division, NFRDI) , Park, Mi-Seon (Aquaculture Management Division, NFRDI) , Min, Byung-Hwa (Aquaculture Management Division, NFRDI) , Jeong, Seong-Jae (Fisheries System Engineering Division, NFRDI) , Kim, Hyung-Chul (Marine Environment Research Division, NFRDI) , Yoo, Hyun-Il (Seaweed Research Center, NFRDI) , Lee, Won-Chan (Marine Environment Research Division, NFRDI) , Choi, Jae-Suk (Department of Bio-Food Materials, Silla University)

Abstract ▼ AI-Helper

An eco-friendly integrated multi-trophic aquaculture (IMTA) farming technique was developed with the goal of resolving eutrophication by excess feed and feces as fish-farming by-products. A variety of seaweed species were tried to remove inorganic nutrients produced by fish farming. However, there have been few trials to use Sargassum fulvellum in an IMTA system, a species with a relatively wide distribution across regions with various habitat conditions, great nutrient removal efficiency and importance for human food source and industrial purposes. In this regard, our study tried to examine feasibility of using S. fulvellum in an IMTA system by analyzing growth characteristics of the species in an IMTA system comprising of rockfish (Sebastes shlegeli), sea cucumber (Stichopus japonocus) and the tried S. fulvellum (October 2011 - November 2012). We also monitored environment conditions around the system including current speed, water temperature and inorganic nutrient level as they may affect growth of S. fulvellum. S. fulvellum in the IMTA system, which were $15.72{\pm}5.67mm$ long at the start of the experiment in October 2011, grew to a maximum of $1093{\pm}271.13mm$ by May 2012. In September, seaweed growth was reduced to a minimum of $280{\pm}70.43mm$ in length. Then, S. fulvellum began to grow again reaching $325{\pm}196.19mm$ by November 2012. Wet weight of the seaweed was $4.01{\pm}1.89g$ at the start of the experiment and reached a maximum of $109.26{\pm}34.23g$ in May. The weight gradually declined to a low of $15.12{\pm}8.40g$ in September 2012. Weight began to increase once more, rising to $39.27{\pm}21.69g$ by November. During the experiment, the average velocity at the surface and the bottom was 6.5 cm/s and 3.4 cm/s, respectively. The water temperature ranged $5.0-23.5^{\circ}C$, which was considered suitable for growing S. fulvellum. Results of the study indicated no significant differences in inorganic nutrients between pre- and post-IMTA installation. It was thus concluded that S. fulvellum can be a suitable seaweed species to be used in an IMTA system.

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문제 정의

This study was conducted with the assistance of NFRDI (Project for Fishing Village Tourism-Type IMTA Utilizing a Harbor, RP-2012-AQ-069).

제안 방법

100,000 rockfish (Sebastes shlegeli) with an average body weight of 8.6±3.0 g were stocked and reared in the IMTA cage, in which 10 kg extruded pellet feed (National Federation of Fisheries Cooperative Feed, Daejeon, Korea; 45% or greater crude protein, 13% or greater crude fat, 3% crude fiber, 17% crude ash and 2.7% phosphorus) were fed to juveniles from day 3 of the experiment and continuing thereafter for twice a day at 9:00 and 16:00.
fulvellum in the IMTA system can be successful. In addition, this study is the first trial in adopting S. fulvellum in an IMTA system. It will be needed to study further to quantitatively measure nutrient removal efficiency of S.
fulvellum described above, however, there have so far been few trials that the species was employed for IMTA system. In this study, we tried to examine whether S. fulvellum could be used for IMTA system by analyzing growth characteristics of the species in an IMTA system. The experimental IMTA system, which was stocked with rockfish (Sebastes shlegeli), sea cucumber (Stichopus japonocus), and S.
The seed-imbedded cultivation lines were hung vertically by attaching a 500 g weight to the end of a line. To monitor the growth, we made monthly measurements of length and wet weight. At the start of the experiment (October 16, 2011), the length of S.

대상 데이터

Nutrients were analyzed pre- and post-IMTA installation (April and September 2011). Sea water was sampled at three stations both at surface (5 m under the surface) and bottom (1 m above the bottom) near the IMTA system using 5 L Niskin sampling bottle (1010-1.2, General Oceanics Inc., Florida, USA) (Fig. 1). Each of the water samples was filtered through GF/F device until 250 mL was filtered out.
Seaweed seeds for the experiment were provided from a hatchery of Narae fisheries company in Jindo, South Jeolla province. Seaweed cultivation lines were cut into 3 m fragments.
Study area and site plan for current study. The IMTA system located in Susan harbor, Yangyang, Gangwon province along the middle coastline of the Korean East Sea. The hanging culture lines for Sargassum fulvellum were set outside of the fish cage.
fulvellum could be used for IMTA system by analyzing growth characteristics of the species in an IMTA system. The experimental IMTA system, which was stocked with rockfish (Sebastes shlegeli), sea cucumber (Stichopus japonocus), and S. fulvellum, was installed at Susan harbor located in Yangyang, Gangwon province along the middle coastline of the Korean East Sea. We also monitored environment conditions around the system including current speed, water temperature and inorganic nutrient level as they may affect growth of S.
The monitoring devices were set to record measurements every 10 minutes. Wind data was obtained from the regional meteorological office in Yangyang, Korea. During the study period, water temperatures around the system were also measured (Fig.

이론/모형

The filtered water was frozen at -20 ℃, transported to the laboratory and used for analysis upon being thawed. Nutrients including NH₄⁺-N, NO₂^--N, and NO₃^--N were measured using an auto analyzer (QUAATRO, BRAN+LUEBBE, Hamburg, Germany) in accordance with the Marine Environment Analysis Method (MLTM, 2010).

후속연구

fulvellum. Further researches are needed to elucidate the relationship between physical, chemical and biological factors and nutrient removal by S. fulvellum.
fulvellum in an IMTA system. It will be needed to study further to quantitatively measure nutrient removal efficiency of S. fulvellum through qualitative and quantitative analysis of nutrients from fish farming.

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