Synopsis
The longheaded eagle ray, Aetobatus flagellum, has recently increased significantly in numbers in Ariake Sound. It is assumed that it feeds on bivalves and so, to prevent predation by eagle rays on bivalves, a ‘predator control program’ aimed at reducing the ray population has been in place since 2001. We examined their occurrence, age, growth and food in Ariake Sound to obtain data on the ecology of the eagle ray and provide basic information on their potential impact on bivalve stocks in Ariake Bay. The eagle ray is a seasonal visitor to Ariake Sound, increasing in numbers from April, and peaking during the summer. None were captured during surveys in December and February. Their movement pattern around the bay differed according to sex. Pregnant females were caught in the estuary during August and September. Females grew to a larger size than males and apparently lived longer. The maximum ages were 19 years for females and 9 years for males. Growth until two years was similar in both sexes, but after 2 years females grew larger. The eagle ray fed only on bivalves, especially Ruditapes philippinarum and Atrina pectinata, very important fishery species farmed in Ariake Bay.
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References
Blochii M.E. & J.G. Schneider. 1801. Systema Ichthyologiae iconibus cx illustratum. Systema Ichthyolgia 584 pp.
G.M. Cailliet R.L. Radtke B.A. Welden ( 1986) Elasmobranch age determination and verification: a review T. Uyeno R. Arai T. Taniuchi K. Matsuura (Eds) Indo-Pacific Fish Biology: Proceedings of the Second International Conference on Indo-Pacific Fishes The Ichthyological Society of Japan Tokyo 345–360
G.M. Cailliet K.J. Goldman (2004) Age determination and validation in chondrichthyan fishes J.C. Carrier J.A. Musick M.R. Heithaus (Eds) Biology of sharks and their relatives CRC Press New York 399–448
L.J.V. Compagno (1999) Checklist of living Elasmobranchs W.C. Hamlett (Eds) Sharks, Skates, and Rays. The biology of elasmobranch fishes The Johns Hopkins University Press Baltimore 471–498
P. Devadoss (1978) ArticleTitleA preliminary study of the batoid fishery of Cuddalore with a note on the biology Indian J. Fish. 2 181–187
A.E. Gray T.J. Mulligan R.W. Hannah (1997) ArticleTitleFood habits, occurrence, and population structure of the bat ray, Myliobatis californica, in Humboldt Bay, California Environ. Biol. Fish. 49 227–238 Occurrence Handle10.1023/A:1007379606233
B.C. Jones G.H. Green (1977) ArticleTitleAge determination of an elasmobranch (Squalus acanthias) by x-ray spectrometry J. Fish. Res. Bd. Canada. 34 44–48
L.K. Martin G.M. Cailliet (1988) ArticleTitleAge and growth determination of the bat ray, Myliobatis californica Gill, in central California Copeia 1988 754–761
C.H. Peterson F.J. Fodrie H.C. Summerson S.P. Powers (2001) ArticleTitleSite-specific and density-dependent extinction of prey by schooling rays: Generation of a population sink in top-quality habitat for bay scallopes Oecologia 129 349–356
T. Shimizu K. Hatooka (1997) ArticleTitleNew records of the fishes from the Seto Inland Sea I.O.P. Diving News 8 2–6
T. Suzuki M. Hosokawa (1994) ArticleTitleFirst recorded fish species from the Sea of Japan I.O.P. Diving News 5 2–6
S. Tanaka K. Mizue (1979) ArticleTitleStudies on sharks – XV, Age and growth of Japanese dogfish Mustelus manazo Bleeker in the East China Sea Nippon Suisan Gakkaishi 45 43–50
S.F. Thrush R.D. Pridmore J.E. Hewitt V.J. Cummings (1991) ArticleTitleImpact of ray feeding disturbances on sandflat macrobenthos: Do communities dominated by polychaetes or shellfish respond differently ? Mar. Ecol. Prog. Ser. 69 245–252
S.F. Thrush R.D. Pridmore J.E. Hewitt V.J. Cummings (1994) ArticleTitleThe importance of predators on sandflat: interplay between seasonal changes in prey densities and predator effects Mar. Ecol. Prog. Ser. 107 211–222
T. Tokai (1997) ArticleTitleMaximum likelihood parameter estimates of a mesh selectivity logistic model through Solver on MS-Excel Bull. Jpn. Soc. Fish. Oceanogr. 61 288–298
G.H. Vossoughi A.R. Vosoughi (1999) ArticleTitleStudy of batoid fishes in northern part of Hormoz Strait, with emphasis on some species new to the Persian Gulf and Sea of Oman Indian J. Fish. 46 301–306
U. Yamada T. Miya (1989) ArticleTitle Aetobatus flagellum Seikai National Research Institute News 61 1
A. Yamaguchi T. Taniuchi M. Shimizu (1996) ArticleTitleAge and growth of the starspotted dogfish Mustelus manazo from Tokyo Bay, Japan Fish. Sci. 62 919–922
A. Yamaguchi T. Taniuchi M. Shimizu (1998) ArticleTitleGeographic variation in growth of the starspotted dogfish Mustelus manazo from five localities in Japan and Taiwan Fish. Sci. 62 919–922
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Yamaguchi, A., Kawahara, I. & Ito, S. Occurrence, Growth and Food of Longheaded Eagle Ray, Aetobatus flagellum, in Ariake Sound, Kyushu, Japan. Environ Biol Fish 74, 229–238 (2005). https://doi.org/10.1007/s10641-005-0217-0
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DOI: https://doi.org/10.1007/s10641-005-0217-0