Abstract
Ages were estimated for 115 of 899 cownose rays,Rhinoptera bonasus, collected primarily from commercial fishing gear, in lower Chesapeake Bay and vicinity from May through October, 1976–78. Age determinations were made using sectioned vertebral centra and estimates of von Bertalanffy parameters were for males DW∞=119.2, K=0.126, and t0=−3.699, and for females DW∞=125.0, K=0.119, and t0=−3.764. Females attained a larger adult size and the oldest specimen aged was a female 13 years old and 107 cm disc width. Both sexes mature after reaching about 70% of their maximum size and ages at maturity were estimated at 5 to 6 years for males and 7 to 8 years for females. In spring migrating rays schooled by size; they arrived along the North Carolina coast by April and entered Chesapeake Bay by early May. Rays were abundant in the major Virginia tributaries of Chesapeake Bay throughout summer and occurred in salinities as low as 8‰ and at water temperatures between 15–29 °C. Size segregation continued during summer and adults schooled by sex. Most rays left Chesapeake Bay by early October.
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Literature Cited
Babel, J. S. 1967. Reproduction, life history, and ecology of the round stringray,Urolophus halleri Cooper.Calif. Dept. Fish Game Fish Bull. 137:1–104.
Barans, C. A., and V. G. Burrell. 1976. Preliminary findings of trawling on the continental shelf off the southeastern United States during four seasons (1973–1975). S.C. Mar. Resour. Cent. Tech. Rep. 13. 16 p.
Bayliff, W. H. 1951. A record of the cownose ray in Chesapeake Bay.Copeia 1951:100.
Bearden, C. M. 1959. A life history study of the eagle ray,Myliobatis freminvillei Le Sueur 1824, in Delaware Bay. M.S. Thesis, Univ. Delaware, Newark. 37 p.
Bearden, C. M. 1965. Elasmobranch fishes of South Carolina. Contrib. Bears Bluff Lab. 42. 19 p.
Bigelow, H. B., and W. C. Schroeder. 1948. Fishes of the western north Atlantic. Lancets, cyclostomes, and sharks. Mem. Sears Found. Mar. Res. 1(1).
Bigelow, H. B., and W. C. Schroeder. 1953. Fishes of the western north Atlantic. Sawfishes, guitarfishes, skates, rays, and chimaeroids. Mem. Sears Found. Mar. Res 1(2).
BMDP Statistical Software. 1981. W. J. Dixon (chief ed.). Univ. Calif. Press, Berkeley. 725 p.
Brander, K., andD. Palmer. 1985. Growth rate ofRaia clavata in the Northeast Irish Sea.J. Cons. Int. Explor. Mer 42: 125–128.
Bullis, H. R. 1967. Depth segregation and distribution of sex-maturity groups in the marbled catshark,Galeus arae, p. 141–148.In P. W. Gilbert, R. F. Mathewson and D. P. Rall (eds.), Sharks, Skates, and Rays. Johns Hopkins Press, Baltimore.
Cervigon M., F. 1966. Los Peces Marinos de Venezuela, Vol. 1. Estacion de Investigaciones Marinas de Margarita, Fundacion la Salle de Ciencias Naturales, Caracas. 448 p.
Clark, E. 1963. Massive aggregations of large rays and sharks in and near Sarasota, Florida.Zoologica 48:61–64.
Dahlberg, M. D., andR. W. Heard. 1969. Observations on elasmobranchs from Georgia.Q. J. Fla. Acad. Sci. 32:21–25.
Daiber, F. C. 1960. A technique for age determination in the skate,Raja eglanteria.Copeia 1960:258–260.
Daiber, F. C., andR. A. Booth. 1960. Notes on the biology of the butterfly rays,Gymnura altavela andGymnura micrura.Copeia 1960:137–139.
Du Buit, M. H. 1977. Age et croissance deRaja batis et deRaja naevus en Mer Celtique.J. Cons. Int. Explor. Mer 37:261–265.
Edwards, R. R. C. 1980. Aspects of the population dynamics and ecology of the white spotted stingaree,Urolophus paucimaculatus Dixon, in Port Phillip Bay, Victoria.Aust. J. Mar. Freshwater Res. 31:459–467.
Figueiredo, J. L. 1977. Manual de peixes marinhos do sudeste do Brasil, Vol. 1. Introducão. Cacões, raias e quimeras. Museu de Zoologia, Universidade São Paulo. 104 p.
Gudger, E. W. 1910. Notes on some Beaufort fishes—1909.Am. Nat. 44:395–403.
Herald, E. S. 1953. The 1952 shark derbies at Elkhorn Slough, Monterey Bay, and at Coyote Point, San Francisco Bay.Calif. Fish Game 39:237–243.
Hess, P. W., andL. W. Miller. 1963. South by south-west, a migration of cownose rays.Estuarine Bull. 7:3–5.
Hildebrand, S. F., and W. C. Schroeder. 1928. Fishes of Chesapeake Bay.Bull. U.S. Bur. Fish. 43(1). 388 p.
Hoese, H. D. 1962. Sharks and rays of Virginia’s seaside bays.Chesapeake Sci. 3:166–172.
Holden, M. J. 1972. The growth rates ofRaja brachyura, R. clavata andR. montagui as determined from tagging data.J. Cons. Int. Explor. Mer 34:161–168.
Holden, M. J. 1974. Problems in the rational exploitation of elasmobranch populations and some suggested solutions, p. 117–137.In F. R. Harden Jones (ed.), Sea Fisheries Research. Wiley, New York.
Holden, M. J., andM. R. Vince. 1973. Age validation studies on the centra ofRaja clavata using tetracycline.J. Cons. Int. Explor. Mer 35:13–17.
Ingham, M. C. 1979. Marine environmental conditions off the Atlantic and Gulf coasts of the United States, January 1977–March 1978.U.S. Natl. Mar. Fish. Serv. Mar. Fish. Rev. 41:35–47.
Ishiyama, R. 1951. Studies on the rays and skates belonging to the family Rajidae, found in Japan and adjacent regions. 2. On the age-determination of Japanese black-skateRaja fusca Garman (Preliminary Report).Bull. Jpn. Soc. Sci. Fish. 16:112–118.
Joseph, E. B. 1961. An albino cownose ray,Rhinoptera bonasus (Mitchill) from Chesapeake Bay.Copeia 1961:482–483.
Lawler, E. F. 1976. the biology of the sandbar sharkCarcharhinus plumbeus (Nardo, 1827) in the lower Chesapeake Bay and adjacent waters. M.S. Thesis, College of William and Mary, Williamsburg, Virginia. 48 p.
McLaughlin, R. H., andA. K. O’Gower. 1971. Life history and underwater studies of a heterodont shark.Ecol. Monogr. 41:271–289.
Musick, J. A. 1972. Fishes of Chesapeake Bay and the adjacent coastal plain.Va. Inst. Mar. Sci. Spec. Sci. Rep. 65:175–212.
Odenweller, D. B. 1975. An unusual aggregation of bat rays,Myliobatis californica Gill.Calif. Fish Game 61:159.
Orth, R. J. 1975. Destruction of eelgrassZostera marina, by the cownose ray,Rhinoptera bonasus, in the Chesapeake Bay.Chesapeake Sci. 16:205–208.
Otwell, W. S., and T. C. Lanier. 1978. Utilization of North Carolina skates and rays. N.C. Div. Mar. Fish. Spec. Sci. Rep. No. 31. 47 p.
Radcliffe, L. 1916. The sharks and rays of Beaufort, North Carolina.Bull. U.S. Bur. Fish. 34:241–284.
Richards, S. W., D. Merriman, andL. H. Calhoun. 1963. Studies on the marine resources of southern New England. IX. The biology of the little skate,Raja erinacea Mitchill.Bull. Bingham Oceangr. Coll. Yale Univ. 18:4–67.
Ricker, W. E. 1975. Computation and interpretation of biological statistics of fish populations.Bull. Fish. Res. Board Can. 191. 382 p.
Ryland, J. S., andT. O. Ajayi. 1984. Growth and population dynamics of threeRaja species (Batoidei) in Carmathan Bay, British Isles.J. Cons. Int. Explor. Mer 41:111–120.
Sage, M., R. G. Jackson, W. L. Klesch, and V. L. deVlaming. 1972. Growth and seasonal distribution of the elasmobranch,Dasyatis sabina.Contrib. Mar. Sci. 16:71–74.
Schwartz, F. J. 1964. Fishes of Isle of Wight and Assawoman Bays near Ocean City, Maryland.Chesapeake Sci. 5:172–193.
Schwartz, F. J. 1965. Inter-American migrations and systematics of the western Atlantic cownose ray,Rhinoptera bonasus. Assoc. Island Mar. Lab. Meet. 6.
Schwartz, F. J. 1967. Embryology and feeding behavior of the Atlantic cownose ray,Rhinoptera bonasus. Assoc. Island Mar. Lab. Meet. 7.
Shaw, E. 1962. The schooling of fishes.Sci. Am. 206:128–138.
Smith, H. M. 1907. The fishes of North Carolina. N.C. Geol. Econ. Sur. Rep. 2:47.
Smith, J. W. 1980. The life history of the cownose ray,Rhinoptera bonasus (Mitchill 1815), in lower Chesapeake Bay, with notes on the management of the species. M.A. Thesis, College of William and Mary, Williamsburg, Virginia. 151 p.
Smith, J. W., andJ. V. Merriner. 1985. Food habits and feeding behavior of the cownose ray,Rhinoptera bonasus, in lower Chesapeake Bay.Estuaries 8:305–310.
Smith, J. W., andJ. V. Merriner. 1986. Observations on the reproductive biology of the cownose ray,Rhinoptera bonasus, in Chesapeake Bay.Fish. Bull. U.S. 84:871–877.
Springer, S. 1960. Natural history of the sandbar shark,Eulamia milberti.U.S. Fish Wildl. Serv. Fish. Bull. 61:1–38.
Springer, S. 1967. Social organization of shark populations, p. 149–175.In P. W. Gilbert, R. F. Mathewson and D. P. Rall (eds.), Sharks, Skates and Rays. Johns Hopkins Press, Baltimore.
Steven, G. A. 1933. Rays and skates of Devon and Cornwall. III. The proportions of the sexes in nature and in commercial landings, and their significance to the fishery.J. Mar. Biol. Assoc. U.K. 18:611–625.
Struhsaker, P. 1969. Observations on the biology and distribution of the thorny stringray,Dasyatis centroura (Pisces: Dasyatidae).Bull. Mar. Sci. 19:456–481.
Taylor, A. J., and M. J. Holden. 1964. The preparation and use of vertebrae for age determination in rays. Cons. Int. Explor. Mer Near North Seas Comm. Comm. Memo. Pap. Rep. 145. 4 p.
Waring, G. T. 1984. Age, growth, and mortality of the little skate off the northeast coast of the United States.Trans. Amer. Fish. Soc. 113:314–321.
Wenner, C. A., C. A. Barans, B. W. Stender, and F. H. Berry. 1979. Results of MARMAP otter trawl investigations in the South Atlantic Bight. IV. Winter-early spring, 1975, S.C. Mar. Res. Cent. Tech. Rep. No. 44. 59 p.
Wourms, J. P. 1977. Reproduction and development in chondrichthyan fishes.Am. Zool. 17:379–410.
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Based on part of a thesis submitted by the senior author in partial fulfillment of the degree of Master of Arts at the College of William and Mary, Williamsburg, Virginia 23185.
Contribution No. 1385 from the Virginia Institute of Marine Science School of Marine Science, the College of William and Mary, Gloucester Point, Virginia 23062.
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Smith, J.W., Merriner, J.V. Age and growth, movements and distribution of the cownose ray,Rhinoptera bonasus, in Chesapeake Bay. Estuaries 10, 153–164 (1987). https://doi.org/10.2307/1352180
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DOI: https://doi.org/10.2307/1352180