We investigated physicochemical properties and isotopic compositions of organic matter (δ13CTOC and δ15NTN) in the old fish farming (OFF) site after the cessation of aquaculture farming. Based on this approach, our objective is to determine the organic matter origin and their relative contributions preserved at sediments of fish farming. Temporal and spatial distribution of particulate and sinking organic matter (OFF sites: 2.0 to 3.3 mg L-1 for particulate matter concentration, 18.8 to 246.6 g m-2 day-1 for sinking organic matter rate, control sites: 2.0 to 3.5 mg L-1 for particulate matter concentration, 25.5 to 129.4 g m-2 day-1 for sinking organic matter rate) between both sites showed significant difference along seasonal precipitations. In contrast to variations of δ13CTOC and δ15NTN values at water columns, these isotopic compositions (OFF sites: -21.5‰ to - 20.4‰ for δ13CTOC, 6.0‰ to 7.6‰ for δ15NTN, control sites: - 21.6‰ to - 21.0‰ for δ13CTOC, 6.6‰ to 8.0‰ for δ15NTN) investigated at sediments have distinctive isotopic patterns (p<0.05) for seawater-derived nitrogen sources, indicating the increased input of aquaculture-derived sources (e.g., fish fecal). With respect to past fish farming activities, representative sources (e.g., fish fecal and algae) between both sites showed significant difference (p<0.05), confirming predominant contribution (55.9±4.6%) of fish fecal within OFF sites. Thus, our results may determine specific controlling factor for sustainable use of fish farming sites by estimating the discriminative contributions of organic matter between both sites.

Abstract
서 론
재료 및 방 법
    1. 연구 지역 및 시료 채집
    2. 유기탄소 및 질소의 농도 분석
    3. 총 탄소 및 질소 안정동위원소 비 분석
    4. 베이시안 믹싱 모델 (Bayesian mixing model)
결 과
    1. 수층 환경
    2. 퇴적물 환경
    3. 유기물 기여도 분석
고 찰
    1. 시 . 공간적 총 유기탄소 및 질소 분포 변화
    2. 유기탄소 및 질소 안정동위원소 특성
    3. 과거 양식장 퇴적물 내 유기물 분포 특성
적 요
REFERENCES

• 고영신(국립수산과학원 어장환경과) | Young-Shin Go (National Institute of Fisheries Science, Marine Environment Research Division)
• 이대인(국립수산과학원 어장환경과) | Dae-In Lee (National Institute of Fisheries Science, Marine Environment Research Division)
• 김청숙(국립수산과학원 어장환경과) | Chung Sook Kim (National Institute of Fisheries Science, Marine Environment Research Division)
• 심보람(서해수산연구소 자 원환경과) | Bo-Ram Sim (Fisheries Resources and Environment Division, West Sea Fisheries Research Institute, National Institute of Fisheries Science)
• 김형철(국립수산과학원 연구기획과) | Hyung Chul Kim (National Institute of Fisheries Science, Research and Development Planning Division)
• 이원찬(국립수산과학원 어장환경과) | Won- Chan Lee (National Institute of Fisheries Science, Marine Environment Research Division)
• 이동헌(국립수산과학원 어장환경과) | Dong-Hun Lee (National Institute of Fisheries Science, Marine Environment Research Division) Corresponding Author