キハダ人工種苗の相対成長と尾骨の形成

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1 キハダ人工種苗の相対成長と尾骨の形成誌名水産総合研究センター研究報告 ISSN 著者巻 / 号清水, 弘文塩澤, 聡 10 号掲載ページ p. 1-7 発行年月 2004 年 3 月農林水産省農林水産技術会議事務局筑波産学連携支援センター Tsukuba Business-Academia Cooperation Support Center, Agriculture, Forestry and Fisheries Research Council Secretariat

2 10 1 7, 16 Bull. Fish. Res. Agen. No. 10, 1-7, Allometry and development of caudal skeleton of hatchery-reared yellowfin tuna Thunnus albacares Hirofumi SHIMIZU 1 and Satoshi SHIOZAWA 2 Abstract Yellowfin Tuna Thunnus albacares reared at Ishigaki Station, Japan Sea- Farming Association in May and June 1997 were examined to clarify the allometry and the developmental osteology of the caudal skeleton on 298 specimens. Fishes ranged in length from 3.1 to 40.8mm TL and in age from two to 30 days after hatching. A total of 73 wild juveniles were measured allometry in eight characters. A growth winding point in allometry ofhatchery-rearedyellowfin Tuna was observed in fishes from 10 to 15mm TL. Significant differences were found between wild and hatchery-reared fishes regarding allometry in eight characters measured. The components ofthe caudal skeleton first appeared in fishes at 5.75mmTL. Ossification began at 11.30mm TL at the point of neural and haemal spines of pleural centrum 4. All the components of the caudal skeleton appeared at 31.50mm TL and half of them were ossified by that time. Key Words: Thunnus albacares, Yellowfin Tuna, growth, caudal skeletonation Thunnus albacares Kaji et al Received on February 6, Contribution No. A 48 from the Fisheries Research Agency * Ishigaki Tropical Station, Seikai National Fisheries Research Institute, Fukai Ohta, Ishigaki , Japan * 2 ( ) Obama Station, Japan Sea-Farming Association Matsumae 26 Tomari, Obama , Japan * : 5 pp * : 9 pp * : 9, p.110.

3 2 1985; 1987; L m 3 225, S 8 L Lethrinus nebulosus Plectropomus leopardus g/ m mm 40.8mm 298 Fig mm Dingerkus and Uhler 1977, 1990 Potthoff cm mm mm cm mm Table 1 10mm Fig. 2 A, C, D, E, G 15mm Fig. 2 B 14mm Fig. 2 F 10mm 10mm 15mm Fig. 2 H Fig. 1. Growth of reared fish samples

4 3 Table 1. Sampling records of Tunnus albacares on wild fish data used in this study Date Location Gear/Method No. of individuals TL mm Res. ves. May 13, N E maruchi-net/surface Keiten Maru May 15, N E maruchi-net/surface Keiten Maru Jun. 22, N E bongo-net/oblique Shunyo Maru Jun. 28, N E bongo-net/oblique Shunyo Maru May 15, N E maruchi-net/surface Keiten Maru May 15, N E maruchi-net/surface Keiten Maru May 15, N E maruchi-net/surface Keiten Maru May 16, N E maruchi-net/surface Keiten Maru May 16, N E maruchi-net/surface Keiten Maru Jun. 5, N E larva-net/surface Yoko Maru Jun. 5, N E larva-net/surface Yoko Maru Jun. 5, N E larva-net/surface Yoko Maru Jun. 5, N E larva-net/surface Yoko Maru Jun. 5, N E larva-net/surface Yoko Maru Jun. 5, N E larva-net/surface Yoko Maru Jun. 6, N E larva-net/surface Yoko Maru Jun. 6, N E larva-net/surface Yoko Maru Jun. 6, N E larva-net/surface Yoko Maru Jun. 6, N E larva-net/surface Yoko Maru Jun. 7, N E larva-net/surface Yoko Maru Jun. 7, N E larva-net/surface Yoko Maru Jun. 7, N E larva-net/surface Yoko Maru Jun. 7, N E larva-net/surface Yoko Maru Jun. 7, N E larva-net/surface Yoko Maru Jun. 7, N E larva-net/surface Yoko Maru Jun. 8, N E larva-net/surface Yoko Maru Jun. 8, N E larva-net/surface Yoko Maru y p y p mm 5.50mm NL Fig. 3 A 5.80mm 5.53 mm NL 9 Fig. 3 B 6.50mm 6.32mm NL Fig. 3 C 7.10mm 6.85mm NL Fig. 3 D 7.50mm 6.90 mm NL 12 Fig. 3 E 8.50mm 7.50mm SL 14 5 Fig. 3 F 10.4mm 9.20mm SL Fig. 3 G 11.30mm 9.98mm SL 17 4 Fig. 3 H 13.20mm 11.45mm SL 19 Fig. 3 I 15.15mm 13.05mm SL Fig. 3 J 20.50mm 17.7mm SL 25 Fig. 3 K 31.50mm 27.30mm SL 29 Fig. 3 L

5 4 清水弘文塩澤聡 Fig. 2. Allometry of larvae and juveniles of Thunnus albacares. A: Relationship of the ratio of head length (HL) to total length (TL) and TL, B: relationship of the ratio of eye diameter (ED) to TL and TL, C: relationship of the ratio of snout length (SL) to TL and TL, D: relationship of the ratio of upper jaw length (UJL) to TL and TL, E: relationship of the ratio of lower jaw length (LJL) to TL and TL, F: relationship of the ratio of preanal length (PAL) to TL and TL, G: relationship of the ratio of body depth (BD) to TL and TL, H:relationship of the ratio of caudal peduncle depth (CPD) to TL and TL. ; wild, ; reared.

6 5 Fig. 3. Development of caudal skeleton in Thunnus albacares. The stippled areas show cartilage. The open area shows the ossified portions. cphpu, post-haemal spine cartilage of pleural centrum; cpnpu, post-neural spine cartilage of pleural centrum, EP, epural; HPY, haemal spine of pleural centrum; HY, hypural; NC, notochord; NPU, neural spine of pleural centrum; PH, parhypural; PU, pleural centrum; UN, uroneural; US, urostyle, DAH stands for days after hatching.

7 mm 13mm mm 10 15mm 1 Kaji et al mm 11 14mm 2 Potthoff 1975 Thunnus atlanticus 1998 Fig. 4. Scheme of the developmental plan for the components in the caudal skeleton of Thunnus albacares., component appearance;, initial ossification;, complete ossification; Broken line, cartilaginous stage; Solid line, ossification.

8 7 5.1mm mm 5.75mm TL m m 6.00mm TL mm 7.50mm 8.50mm TL 9.20mm 10.40mm TL mm 9.20mm 10.40mm TL 10.80mm 12.56mm TL mm 3 Fig. 4 10mm 10mm Dingerkus, G. and Uhler L. D., 1977: Enzyme clearing of alcian blue stained whole small vertebrates for demonstration of cartilage. Stain Tecnol., 52, , pp Kaji T., Tanaka M., Oka M., Takeuchi H., Ohsumi S., Teruya K., and Hirokawa J., 1999: Growth and morphological development of laboratory -reared yellowfintunathunnus albacares larvae and early juveniles, with special emphasis on the digestive system. Fish. Sci., 65, Potthoff T., 1974: Osteological development and variation in young tunas, genus Thunnus Pisces, Scombridae, from the Atlantic Ocean. Fish. Bull. 72, Potthoff T., 1975: Development and structure of the caudal complex, the vertebral column, and the pterygiophores in the black fin tuna Thunnus atlanticun, pisces, Scombridae. Bull. Marine Sci. 25, Rodriguez-Roda J. and Dicenta A. 1981: Spawning grounds of Thunnus thynnus, Auxis thazard and Sarda sarda off the Spanish and Moroccan coasts. Collect. Vol. Sci. Pap. Iccat. 15, , , , , Tunnus thynnus. Nippon Suisan Gakkaishi, 56,

農林水産業における自然エネルギーの効率的利用技術に関する総合研究（グリーンエナジー計画）第1期成果の概要

( グリーンエナジー計画 ) 第一期成果の概要誌名農林水産業における自然エネルギーの効率的利用技術に関する総合研究著者農林水産技術会議事務局, 掲載ページ p. 1-207 発行年月 1982 年 3 月農林水産省農林水産技術会議事務局筑波事務所 Tsukuba Office, Agriculture, Forestry and Fisheries Research Council Secretariat