Fishery Bulletin articles from July 2005

Fishery Bulletin archives from July 2005

Using poststratification to improve abundance estimates from multispecies surveys: a study of juvenile flatfishes.
July 1, 2005... Abstract--Population assessments seldom incorporate habitat information or use previously observed distributions of fish density. Because habitat affects the spatial distribution offish density and overall abundance, the use of habitat...

Length at maturity in three pelagic sharks (Lamna nasus, Isurus oxyrinchus, and Prionace glauca) from New Zealand.
July 1, 2005... Abstract--Reproductive data collected from porbeagle, shortfin mako, and blue sharks caught around New Zealand were used to estimate the median length at maturity. Data on clasper development, presence or absence of spermatophores or...

Survey- and fishery-derived estimates of Pacific cod (Gadus macrocephalus) biomass: implications for strategies to reduce interactions between groundfish fisheries and Steller sea lions (Eumetopias jubatus).
July 1, 2005... Abstract--Survey- and fishery-derived biomass estimates have indicated that the harvest indices for Pacific cod (Gadus macrocephalus) within a portion of Steller sea lion (Eumetopias jubatus) critical habitat in February and March 2001 were...

Mitochondrial gene sequences useful for species identification of western North Atlantic Ocean sharks.
July 1, 2005... Abstract--Molecular-based approaches for shark species identification have been driven largely by issues specific to the fishery. In an effort to establish a more comprehensive identification data set, we investigated DNA sequence variation of...

Genetic variation of rougheye rockfish (Sebastes aleutianus) and shortraker rockfish (S. borealis) inferred from allozymes.
July 1, 2005... Abstract--Rougheye rockfish (Sebastes aleutianust and shortraker rockfish (Sebastes borealisi were collected from the Washington coast, the Gulf of Alaska, the southern Bering Sea, and the eastern Kamchatka coast of Russia (areas encompassing...

The reproductive cycle of the thorny skate (Amblyraja radiata) in the western Gulf of Maine.
July 1, 2005... Abstract--The thorny skate {Amblyraja radiata) is a large species of skate that is endemic to the waters of the western north Atlantic in the Gulf of Maine. Because the biomass of thorny skates has recently declined below threshold levels...

Effect of type of otolith and preparation technique on age estimation of larval and juvenile spot (Leiostomus xanthurus).
July 1, 2005... Otoliths of larval and juvenile fish provide a record of age, size, growth, and development (Campana and Neilson, 1985; Thorrold and Hare, 2002). However, determining the time of first increment formation in otoliths (Campana, 2001) and...

Preliminary use of oxygen stable isotopes and the 1983 El Nino to assess the accuracy of aging black rockfish (Sebastes melanops).
July 1, 2005... Black rockfish (Sebastes melanops) range from California to Alaska and are found in both nearshore and shallow continental shelf waters (Love et al., 2002). Juveniles and subadults inhabit shallow water, moving deeper as they grow. Generally,...