CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ...
CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ... CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ...
RUTLEDGE: TEXAS MARINE HATCHERY PROGRAM CalCOFl Rep., Vol. 30,1989 The Texas experience has shown several things that are generically applicable to the evaluation of other marine stocking programs: 1. The effectiveness of marine fisheries stock enhancement programs cannot be evaluated on an a priori basis. To measure the impact, fish must be stocked. Once they have been stocked successfully, the system will be forever changed. 2. Substantive impact on a large, dynamic fishery may require massive stockings. Experimental designs using small numbers of fish may not show up against annual variation in population abundance. 3. Although managers may strive for statistical accuracy measured with a micrometer, benefits may only be measurable with a yardstick. Longterm trends may be the only indicator of success. LITERATURE CITED Buniguardner, B. W., R. L. Colura, A. F. Maciorowski, and G. C. Matlock. 1988. Tag retention, survival, and growth of fingerling red drums marked with coded wire tags. Poster presented at the lnternational Symposium and Educational Workshop on Fish-Marking Techniques, Seattle, Washington, 27 June-1 July, 1988. Dailey, J. A., and L. W. McEachron. 1986. Survival of unmarked red drum stocked into two Texas bays. Tx. Pks. and Wildl. Dept., Coast. Fish. Br., Mgnit. Data Ser. No. 116, 8 pp. Gibbard, G. L., and R. L. Colura. 1980. Retention and movement of magnetic nose tags in juvenile red drum. Ann. Proc. Tx. Chap. Amer. Fish. SOC. 3:22-29. Hammerschmidt, P. C. 1986. Initial survival of red drum fingerlings stocked in Texas bays during 1984-1985. Tx. Pks. and Wildl. Dept. Coast Fish. Br., Mgmt. Data Ser. No. 106, 13 pp. Hammerschmidt, P. C., and G. E. Saul. 1984. Initial survival of red drum fingerlings stocked in Texas bays during 1983-84. Ann. Proc. Tx. Chap. Amer. Fish. SOC. 7:13-28. Matlock, G. C. 1986a. Estimating the direct market economic impact of sport angling for red drum in Texas. N. Am. Fish. Mgmt. 6:490- 493. -. 1986b. Preliminary results of red drum stocking in Texas. Presented at the 15th Annual Meeting ofthe United States-Japan Natural Resources Program-Aquaculture Panel. Kyoto, Japan. 22 October 1986. -. 1987. The role of hurricanes in determining year-class strength of red drum. Contrib. Mar. Sci. 30:39-47. Matlock, G. C., R. J. Kemp, Jr., and T. J. Heffernan. 1986. Stocking as a management tool for a red drum fishery, a preliminary evaluation. Tx. Pks. and Wildl. Dept., Coast. Fish. Br., Mgmt. Data Ser. No. 75, 27 pp. NMFS (National Marine Fisheries Service). 1986. Secretarial fishery management plan for the red drum fishery of the Gulf of Mexico. Washington, D. C. Rutledge, W. P., and G. C. Matlock. 1986. Mariculture and fisheries management - a future cooperative approach. In Fish culture in fisheries management. Proceedings of a symposium on the role of fish culture in fisheries management, R. H. Stroud, ed. Bethesda, Md: Am. Fish. SOC., Fish Cult. and Fish. Mgmt. Sect. pp. 119-127. Seneca, J. J., and M. K. Taussig. 1974. Environmental economics. New Jersey: Prentice Hall, 354 pp. 52
DAVIS: DESIGNATED HARVEST REFUGIA CalCOFl Rep., Vol. 30,1989 DESIGNATED HARVEST REFUGIA: THE NEXT STAGE OF MARINE FISHERY MANAGEMENT IN CALIFORNIA GARYE DAVIS U. S. National Park Service Channel Islands National Park 1901 Spinnaker Drive Ventura, California 93001 ABSTRACT Marine fishery management has traditionally been based on the biology and population dynamics of individual target species. Management controls are generally exercised through limits on individual fish sizes, seasons of harvest, catch limits, and restrictions on gear efficiency designed to protect reproductive stocks. Distance from port and depth provided de facto refugia from harvest during the first century of modern exploitation, but recently few California nearshore demersal fisheries have been able to sustain high yields using traditional species-specific management strategies. Designated harvest refugia, or fisheries reserves, should now be evaluated as management tools to enhance or sustain these coastal fisheries. In other parts of the world, designated harvest refugia provide recruits to adjacent harvest zones, protect the genetic diversity of wild stocks, and serve as experimental controls for determinations of potential yield. This concept could be adapted to California’s coastal ecosystems by applying accepted theories from ecology and conservation biology. Hypotheses regarding the optimum number, size, and distribution of fishery reserves in relation to harvested zones should be empirically tested in existing marine parks and reserves and in additional protected areas set aside especially for this purpose. RESUMEN La explotaci6n racional de 10s recursos pesqueros se bas6 tradicionalmente en el conocimiento de la biologia y la dinAmica poblacional de ciertas especies. En general, el control de la explotacion se realiza imponiendo limitaciones en el tamafio de 10s individuos, restringiendo la pesca a ciertas estaciones del afio, limitando el tamafio de la captura, y limitando la eficiencia del equipo de pesca con el objeto de proteger el stock reproductor. Durante el primer siglo de la explotacion pesquera moderna, la distancia desde el puerto y la profundidad ofrecian refugios seguros, per0 recientemente una pequefia parte de la pesqueria de- mersal costera en California ha podido mantener un alto rendimiento usando estrategias de explotacion tradicionales. Actualmente, se debe evaluar el us0 de refugios de pesca o reservaciones perqueras como herraminetas de trabajo alternativas si queremos aumentar o mantener estas pequerias costeras. En otras partes del mundo, 10s refugios de pesca proveen reclutas a las zonas de pesca adyacentes, protegen la diversidad genCtica de la poblaci6n salvaje y sirven como control experimental para determinar el rendimiento potencial. Este concept0 podria ser adaptad0 a1 ecosistema costero de California, empleando teorias ecologicas y de conservaci6n biologics. Las hipotesis que consideren el numero optimo, el tamafio y la distribucidn de las reservaciones portegidas de la pesca en relacion a las areas de pesca deberin probarse empiricamente en 10s parques marinos y reservaciones existentes y en areas de proteccion adicionales especialmente disefiadas para este proposito. INTRODUCTION For more than a century, California’s nearshore demersal fisheries were sustained by de facto harvest refugia. Zones beyond the economic reach of vessels and gear went largely unharvested and served as sources of replenishment for harvested areas closer to port or in shallower waters. These refugia have been lost to technological advances in the last 30 to 40 years. Conservation of fishery resources in the future may require designation of management zones to recreate these harvest refugia. This paper describes large-scale, long-term ecological research to test hypotheses regarding the optimum sizes and distributions of harvest refugia required to maximize sustained yields from California’s nearshore fisheries. For more than two decades, fatal flaws in singlespecies and population-based maximum sustainable yield (MSY) approaches to fisheries management have been seriously discussed in the scientific literature (Roedel 1975; Larkin 1977; Barber 1988).
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RUTLEDGE: TEXAS MARINE HATCHERY PROGRAM<br />
CalCOFl Rep., <strong>Vol</strong>. <strong>30</strong>,<strong>1989</strong><br />
The Texas experience has shown several things<br />
that are generically applicable to the evaluation of<br />
other marine stocking programs:<br />
1. The effectiveness of marine fisheries stock enhancement<br />
programs cannot be evaluated on an a<br />
priori basis. To measure the impact, fish must be<br />
stocked. Once they have been stocked successfully,<br />
the system will be forever changed.<br />
2. Substantive impact on a large, dynamic fishery<br />
may require massive stockings. Experimental designs<br />
using small numbers of fish may not show up<br />
against annual variation in population abundance.<br />
3. Although managers may strive for statistical<br />
accuracy measured with a micrometer, benefits<br />
may only be measurable with a yardstick. Longterm<br />
trends may be the only indicator of success.<br />
LITERATURE CITED<br />
Buniguardner, B. W., R. L. Colura, A. F. Maciorowski, and G. C.<br />
Matlock. 1988. Tag retention, survival, and growth of fingerling red<br />
drums marked with coded wire tags. Poster presented at the lnternational<br />
Symposium and Educational Workshop on Fish-Marking<br />
Techniques, Seattle, Washington, 27 June-1 July, 1988.<br />
Dailey, J. A., and L. W. McEachron. 1986. Survival of unmarked red<br />
drum stocked into two Texas bays. Tx. Pks. and Wildl. Dept.,<br />
Coast. Fish. Br., Mgnit. Data Ser. No. 116, 8 pp.<br />
Gibbard, G. L., and R. L. Colura. 1980. Retention and movement of<br />
magnetic nose tags in juvenile red drum. Ann. Proc. Tx. Chap.<br />
Amer. Fish. SOC. 3:22-29.<br />
Hammerschmidt, P. C. 1986. Initial survival of red drum fingerlings<br />
stocked in Texas bays during 1984-1985. Tx. Pks. and Wildl. Dept.<br />
Coast Fish. Br., Mgmt. Data Ser. No. 106, 13 pp.<br />
Hammerschmidt, P. C., and G. E. Saul. 1984. Initial survival of red<br />
drum fingerlings stocked in Texas bays during 1983-84. Ann. Proc.<br />
Tx. Chap. Amer. Fish. SOC. 7:13-28.<br />
Matlock, G. C. 1986a. Estimating the direct market economic impact<br />
of sport angling for red drum in Texas. N. Am. Fish. Mgmt. 6:490-<br />
493.<br />
-. 1986b. Preliminary results of red drum stocking in Texas. Presented<br />
at the 15th Annual Meeting ofthe United States-Japan Natural<br />
Resources Program-Aquaculture Panel. Kyoto, Japan. 22 October<br />
1986.<br />
-. 1987. The role of hurricanes in determining year-class strength<br />
of red drum. Contrib. Mar. Sci. <strong>30</strong>:39-47.<br />
Matlock, G. C., R. J. Kemp, Jr., and T. J. Heffernan. 1986. Stocking<br />
as a management tool for a red drum fishery, a preliminary evaluation.<br />
Tx. Pks. and Wildl. Dept., Coast. Fish. Br., Mgmt. Data Ser.<br />
No. 75, 27 pp.<br />
NMFS (National Marine Fisheries Service). 1986. Secretarial fishery<br />
management plan for the red drum fishery of the Gulf of Mexico.<br />
Washington, D. C.<br />
Rutledge, W. P., and G. C. Matlock. 1986. Mariculture and fisheries<br />
management - a future cooperative approach. In Fish culture in fisheries<br />
management. Proceedings of a symposium on the role of fish<br />
culture in fisheries management, R. H. Stroud, ed. Bethesda, Md:<br />
Am. Fish. SOC., Fish Cult. and Fish. Mgmt. Sect. pp. 119-127.<br />
Seneca, J. J., and M. K. Taussig. 1974. Environmental economics. New<br />
Jersey: Prentice Hall, 354 pp.<br />
52