Download or read book The Effects of Different Otolith Ageing Techniques on Estimates of Growth and Mortality for Two Species of Rockfishes Sebastes Pinniger and Sebastes Diploproa written by Christopher D. Wilson and published by . This book was released on 1984 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of some age determination methods may result in the incorrect age structure of fish populations. This in turn may lead to incorporation of inappropriate data into models used for stock management. Otoliths are commonly used for determining the age of fishes, and ages based on the whole otoliths (surface ages) are often lower than those based on otolith sections of long-lived, slow-growing fishes such as rockfishes (Sebastes spp.). Therefore, significant overestimates in growth and mortality may occur when surface ages are used for these species. This study provides estimates of growth and total instantaneous mortality for Sebastes diploproa and S. pinniger based on ages determined from the otolith surface versus those determined from otolith sections. For both species, estimates of mortality were reduced by more than half when section rather than surface ages were used. Estimates of growth based on surface rather than section ages were nearly identical for S. diploproa but appeared higher for S. pinniger. The inclusion of posterior otolith projections in the surface counts of S. diploproa and not S. pinniger are suspected of producing these differences. Because of these revised estimates of mortality and growth the life history features and response to exploitation of these species must be re-evaluated. Maximum sustainable yields of S. ninniger and S. diploproa based on surface ages are 2 to 5 times greater for either species than yields based on section ages. Mistaken estimates such as these can lead to management errors resulting in overexploitation and may thus explain the depletion of some stocks of Sebastes spp.
Download or read book Sport Fishery Abstracts written by and published by . This book was released on 1991 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fishery Bulletin written by and published by . This book was released on 1998 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collected Reprints written by Southwest Fisheries Center (U.S.) and published by . This book was released on 1987 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Collected Reprints written by and published by . This book was released on 1992 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fisheries Review written by and published by . This book was released on 1991 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of Activities written by Southwest Fisheries Center (U.S.) and published by . This book was released on 1989 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the 1992 Western Groundfish Conference written by and published by . This book was released on 1992 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Data limited Research in Stock Assessment to Increase the Understanding of Fisheries Resources and Inform and Improve Management Efforts written by Giuseppe Scarcella and published by Frontiers Media SA. This book was released on 2023-04-10 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlas of Eastern Tropical Pacific Oceanographic Variability and Cetacean Sightings 1986 1989 written by and published by . This book was released on 1990 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book California Fish and Game written by and published by . This book was released on 2008 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pacific Coast Groundfish Plan CA OR WA written by and published by . This book was released on 1982 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Essential Fish Habitat Designation and Minimization of Adverse Impacts Pacific Coast Groundfish Fishery Management Plan written by and published by . This book was released on 2005 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology Abstracts written by and published by . This book was released on 1991 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecologists will find in this journal the essence of current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Ecology Abstracts focuses on how organisms of all kinds - microbes, plants, and animals - interact with their environments and with other organisms. Included are relevant papers on evolutionary biology, economics, and systems analysis as they relate to ecosystems or the environment. With coverage ranging from habitats to food chains, from erosion to land reclamation, the journal provides an important cross-section of current findings in target research areas. Detailed information on resource and ecosystems management and modeling contributes to the journal's practical value, as does material on the impact of climate, water resources, soil, and man or growing environmental problems such as depletion, erosion, and pollution all topics which are covered in depth. Comprehensive, yet carefully focused coverage makes this an essential resource for scientists concerned with preserving the environment.
Download or read book Proceedings of the International Rockfish Symposium Anchorage Alaska USA October 20 22 1986 written by Brenda Melteff and published by . This book was released on 1987 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Sevin Application on Littoral Flat Meiofauna written by Charles A. Simenstad and published by . This book was released on 1989 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alaska Fishery Research Bulletin written by and published by . This book was released on 2001 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
