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Demographic Analysis of the Sandbar Shark, Carcharhinus Plumbeus in the Western North Atlantic

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Demographic Analysis of the Sandbar Shark, Carcharhinus Plumbeus in the Western North Atlantic W&M ScholarWorks VIMS Articles 1996 Demographic Analysis Of The Sandbar Shark, Carcharhinus Plumbeus In The Western North Atlantic TR Sminkey JA Musick Virginia Institute of Marine Science Follow this and additional works at: https://scholarworks.wm.edu/vimsarticles Part of the Aquaculture and Fisheries Commons Recommended Citation Sminkey, TR and Musick, JA, "Demographic Analysis Of The Sandbar Shark, Carcharhinus Plumbeus In The Western North Atlantic" (1996). VIMS Articles. 591. https://scholarworks.wm.edu/vimsarticles/591 This Article is brought to you for free and open access by W&M ScholarWorks. It has been accepted for inclusion in VIMS Articles by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. 341 Abstract.-The sandbarshark. Car­ charhinus plumbeus. is the most com­ Demographic analysis of the sandbar mon large coastal shark in Virginia waters and is an important component shark, Carcharhinus plumbeus, of recreational and commercial fisher­ ies along the east coast of the United in the western North Atlantic'" States. Sandbar shark demographic analyses, using known and estimated life history parameters, including fish­ Thomas R. Sminkey ing mortality (F> at ages and levels es­ Florida Marine Research Institute. Department of Environmental Protection timated in a recent stock assessment, 100 Eighth Avenue SE. St. Petersburg. Florida 3370 J were used to estimate potential popu­ lation growth and exploitation. Life his­ tory tables were constructed by using John A. Musick best estimates ofnatural mortality 1M> Virginia Institute of Marine Science. School of Marine Science of0.11 or 0.07 for maximum ages of30 College of William and Mary. Gloucester Point. Virginia 23062 or 60 yr, respectively. Natality was fixed at 2.1 female pups/yr. Fishing mortal­ ity IF=0.05. 0.10, 0.15. 0.20. or 0.25) was simulated to begin at age 8, 10. 15. 20, or 29. The annual population growth rate was highest under a "best­ case~ scenario of M=0.05 (1/2 best esti­ mate) and maximum age of 30 yr, but The sandbar shark, Carcharhinus Colvocoresses and Musick2 have was only 11.9%/yr. At M=O.l1 for all plumbeus, ranges from Cape Cod to provided updated parameters nec­ ages, the population increase rate was Brazil in the western North Atlan­ essary for a demographic analysis 6.4%/yr, and the generation time was ofthe sandbar shark. This analysis about 20 years. At higherjuvenile mor­ tic <Bigelow and Schroeder, 1948; tality rates, the population growth rate Springer, 1960; Garrick, 1982) and uses estimates oflongevity, age-spe­ decreased to 2.6%/yr. Adding fishing is the most common large coastal cific survival. and age-specific na­ mortality at immature ages caused the shark in Virginia waters (Musick et tality to construct a life history table population to decline unless F levels aI., 1993), It comprises 20% of the which generates estimates of the were <0.10 and 0.05 at maximum age = large-shark fauna of the U.S. east net reproductive rate per genera­ 30 and 60. respectively. It is apparent that sandbar shark populations will coast and is an important compo­ tion, the generation time, and the decline under any substantial fishing nent ofrecreational and commercial intrinsic rate of increase of the mortality on immature ages and that fisheries (Hoff, 1990; Musick et aI., population (Krebs, 1985). These mature fish can be exploited only at 1993;Anonymous!). Age and growth parameters are useful for manage­ very low levels. (Casey et aI., 1985; Casey and ment purposes and for input into Natanson, 1992; Sminkey and population models (Krebs, 1985; Musick, 1995), seasonal distribu­ Hoenig and Gruber, 1990). The ob­ tion (Bigelow and Schroeder, 1948; jective ofthis study is to provide an Springer, 1960; Musick etaI., 1993), updated demographic analysis of and reproductive biology (Colvo­ the sandbar shark by estimating coresses and Musick2) of the sand­ population parameters under vary­ bar shark have been studied, but ing conditions of natural mortality population studies have been lim­ and fishing mortality (i.e. mortal­ ited to a time series ofrelative abun­ ity caused by fishing). dance in Virginia waters (Musick et aI., 19931 and to a demographic analysis based on previously pub­ • Contribution 1983 of the Virginia Insti­ lished life history parameters (Hoff, tute of Marine Science. School of Marine Science. College of William and Mary. 19901. Gloucester Point, VA 23062. The recent increase in fishing 1 Anonymous. 1992. Fishery manage­ pressure on sandbar sharks and ment plan for sharks of the Atlantic Ocean. U.S. Dep. Commer.. NMFS. subsequent decline in abundance NOAA, 10 December 1992. (Musick et aI., 19931, revised age 2 Colvocoresses, J. A., and J. A. Musick. and growth studies (Casey and 1989. Reproductive biology of the sand­ Natanson, 1992; Sminkey and bar shark, Carcharhinus plumbeus, in the Chesapeake Bight. Abstract, 69th annual Manuscript accepted 4 December 1995. Musick, 1995), and a reexamination meeting, Am. Soc. Ichthyology and Herp.; Fishery Bulletin 94:341-347 (1996). of fecundity data presented in 17-23 June 1989. San Francisco, CA. 342 Fishery Bulletin 94(2), 1996 Materials and methods The probable maximum age for sandbar sharks differs between the von Bertalanffy growth equation Based on size at maturity (Springer. 1960; Sminkey. derived from vertebral data (Sminkey and Musick, 1994) and von Bertalanffygrowth equations for sand­ 1995) and the growth equation from tag and recap­ bar sharks determined by Sminkey and Musick ture data (Casey and Natanson, 1992). The latter (1995), age at 100% maturity was determined to be study reported tagged sandbars estimated to be 22 15 years. Casey and Natanson (1992) determined age 1155 cm fork length, FLI. 32 (157 cm FLI, and over at maturity to be ca. 29 years on the basis of a von 40 years old (185 cm FLI at recapture; the 22-year­ Bertalanffy growth equation derived from tag and re­ old was determined to be immature. The first 2 of capture information and a similarsize atmaturity. For these ages were estimated on the basis of length at this demographic analysis, 15 and 29 years therefore release. a vertebrally derived growth equation (sexes were used in separate trials as conservative estimates combined) ofCasey and Natanson (1992), and on time ofthe age at which 100% offemales were mature. at liberty. Regarding the 40+ year old shark, Casey The age-specific natality was determined from a and Natanson (1992) stated "since length at first reexamination of the data from 50 pregnant sand­ maturity is 150 cm FL, it is reasonable to assume bar sharks collected from 1974 to 1986 (Colvocoresses that this individual was over 30 yr old at tagging and Musick2) and from 3 additional females collected and over 40 yr at recapture." Casey and Natanson during 1990-92. Results similar to those reported (1992) then suggested that sandbar sharks may live by Colvocoresses and Musick2 were obtained. The re­ in excess of 50 years. Sminkey and Musick (1995) lationship between maternal size and number ofpups reported that the oldest individual examined (175 was very weak (Fig. 1; r 2=0.25), with the average cm FLI was 24 years old (determined by vertebral number ofpups per litter equal to 8.4 (n=53. SD=2.3 I. counts). On the basis of vertebral data of Sminkey Sandbar sharks produce a litter once every 2 years and Musick (1995 I, it seems reasonable to consider CBranstetter3; Musick, unpubl. datal with a sex ra­ the maximum age for sandbar sharks to be about 30 tio not significantly different from 1:1. Thus, age­ years. For the life history tables, 30 and 60 years specific natality was fixed at 2.1 female pups peryear were considered as maximum ages in separate trials. beginning with age of maturity. To examine the effects of fishing mortality (F) on the demography ofthe sandbar shark. the survivor­ 3 Branstetter. S. 1994. Gulfand South Atlantic Fisheries De­ ship function was modified in several trials to in­ velopment Foundation, Tampa, FL 33609. Personal commun. clude fishing mortality. Values of F included 0.25, 1-1 t2 '"c.. III :::> ....c.. 0 II ..l\) ~ e 6 ::::l Z _-------:.--...;,A A -I ." = O.l07x - 13.26 r! = 0.25 2 11=53 u t7:; IS:; 195 205 215 225 Maternal total length (em) Figure 1 Maternal size (total length) ofsandbar shark. Carcharhinus plumbeus, versus number of pups produced per litter. Sminkey and Musick: Demographic analysis of Carcharhinus plumbeus 343 0.20, 0.15, 0.10, and 0.05. F = 0.25 was the approxi­ creased juvenile mortality, the population will in­ mate level ofmortality on large coastal sharks in the crease at 6.4% per year (Table 1). Ifnatural mortal­ fishery from 1986 to 1991 and is the recommendedF ity were lower ("best-case" scenario, survival=0.95l, 1 for maximum sustainable yield (Anonymous ). The the population could increase at a rate ofnearly 12%/ mean carcass size of all large coastal sharks in the yr (Table 2). Ifthere was increased mortality ofneo­ 1986-91 fishery was approximately 24 Ib (Anony­ nates and age-1 sharks, the population increase rate mous1), but the mean carcass size landed for sand­ would range from 2.1%/yr to 7.2%/yr (Table 2 l. These bar sharks only was approximately 40 Ib fBran­ rates all suggest healthy and increasing populations stetter3 l. Based on two sandbar shark growth mod­ without fishing. Population replacement (r=O.OI was els, 24 and 40 Ib correspond to ages 8 and 12 years, attained with annual survival rates of 0.70 for neo­ respectively (Sminkey and Musick, 1995; Musick, nates and 0.85 for age 0+ fish, and 0.50, 0.70, and unpubl.
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