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01 Bulletin of marine sciences and fisheries, Kochi University (高知大学海洋生物研究報告)  12(1992)-25(2007) >

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タイトル: マダイ稚魚を中心とした海洋生物による海藻生育用基盤礁の利用
その他のタイトル: Studies on the use of eelgrass-shaped substrate reef by the juvenile red sea bream, Pagrus major, and other organisms
著者: 阿部, 文彦
Abe, Fumihiko
キーワード: Eelgrass-shaped substrates
Algal growth
Fishes
Juvenile red sea bream
individual density
Territory size
雑誌名: Bulletin of Marine Sciences and Fisheries, Kochi University
発行日: 30-Mar-2007
出版者: 高知大学海洋生物教育研究センター
抄録: The eelgrass-shaped substrate reef was set up on the sandy bottom of 7 m in depth in Morode Cove at Ainan Town, Ehime Prefecture. I tried to make an overall evaluation on the eelgrass-shaped substrate reef as a fish-gathering gear by comparing the member of marine organisms, mainly juvenile red sea bream, Pagrus major, found around the reef and its surrounding area from May, 2000 to September, 2004. The eelgrass-shaped substrate reef (2 × 2 m) has seven different configurations: green, long, and thick (Zone 1); green, short, and thick (Zone 2); white, short, and thin (Zones 3 and 8 (1 × 2 m)); green, short, and thin (Zones 4 and 6); green, long, and thin (Zone 5); green, long, and thick with an unplanted area in the middle (Zone 7). Twenty-seven species of algae were observed on the eelgrass-shaped substrate during observation period. Differences in growth condition of algae were found among the 8 units of the eelgrass-shaped substrate zone. Maximum growth of algae was gained at the upper edge of the blade of the thin type. During 1 year after the set of eelgrass-shaped substrate reef, the number of fish species observed within the eelgrass-shaped substrate zones was 90, and this value was higher than that of the surrounding environments (seagrass area; 55 species and sandy bottom area; 22 species). The structure of Zone 1 (long, thick, green and disperse arrangement) showed the highest effect on assembling fishes. Higher density of the juveniles of the red sea bream could be observed around the substrate area. Important food items for the juveniles in the experimental site changed from Tanaidacea to Caprellidea with growth. Gammaridea was taken as a comparatively important food item throughout the juvenile stage. I examined the territory of juvenile red sea bream to analyze the relationships between fish density and territory size at the experimental site. The density showed the highest value in 2001 (0.201 individuals/㎡), the lowest one in 2002 (0.051 individuals/㎡) and the intermediate one in 2003 (0.096 individuals/㎡). At the time of high density in 2001, the mean value of the territory sizes in each size class increased up to 8 cm size class, but after that it did not show any clear increase and became nearly constant at c. 6.4 ㎡. At the time of intermediate density found in 2003, that value increased up to 9 cm size class, but after that it became nearly constant at the level of c. 15 ㎡. At the time of low density found in 2002, that value increased with growth, and it became c. 50 ㎡ at the stage of 14 cm size class. These results suggest that the territory size of juvenile red sea bream is clearly correlated with the individual density, and the size became smaller at the time of high density and vice versa.
URI: http://hdl.handle.net/10126/4402
出現コレクション:01 Bulletin of marine sciences and fisheries, Kochi University (高知大学海洋生物研究報告)  12(1992)-25(2007)

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