Fishery Bulletin articles from July 2007

Fishery Bulletin archives from July 2007

Diel variation in vertical distribution of an offshore ichthyoplankton community off the Oregon coast.
July 1, 2007... Abstract--We examined the diel vertical distribution, concentration, and community structure of ichthyoplankton from a single station 69 km off the central Oregon coast in the northeast Pacific Ocean. The 74 depth-stratified samples yielded...

Validation of a method for estimating realized annual fecundity in a multiple spawner, the long-snouted seahorse (Hippocampus guttulatus), using underwater visual census.
July 1, 2007... Abstract--The long-snouted seahorse (Hippocampus guttulatus) (Cuvier, 1829), was used to validate the predictive accuracy of three progressively realistic models for estimating the realized annual fecundity of asynchronous, indeterminate,...

Abundance, distribution, and habitat of leatherback turtles (Dermochelys coriacea) off California, 1990-2003.
July 1, 2007... Abstract--Leatherback turtles (Dermochelys coriacea) are regularly seen off the U.S. West Coast, where they forage on jellyfish (Scyphomedusae) during summer and fall. Aerial line-transect surveys were conducted in neritic waters (<92 m depth)...

Comparison of survey methods for estimating abundance of harbor seals (Phoca vitulina) in glacial fjords.
July 1, 2007... Abstract--The importance of glacial ice habitats to harbor seals (Phoca vitulina) in Alaska has become increasingly apparent. However, enumerating harbor seals hauled out on ice in glacial fjords has been difficult. At Johns Hopkins Inlet in...

Age and growth of swordfish (Xiphias gladius) caught by the Hawaii-based pelagic longline fishery.
July 1, 2007... Abstract--We verified the age and growth of swordfish (Xiphias gladius) by comparing ages determined from annuli in fin ray sections with daily growth increments in otoliths. Growth of swordfish of exploitable sizes is described on the basis of...

Systematics of the North American menhadens: molecular evolutionary reconstructions in the genus Brevoortia (Clupeiformes: Clupeidae).
July 1, 2007... Abstract--Evolutionary associations among the four North American species of menhadens (Brevoortia spp.) have not been thoroughly investigated. In the present study, classifications separating the four species into small-scaled and large-scaled...

Vertical movement patterns of skipjack tuna (Kotsuwonus pelamis) in the eastern equatorial Pacific Ocean, as revealed with archival tags.
July 1, 2007... Abstract--Thirty-three skipjack tuna (Katsuwonus pelamis) (53-73 cm fork length) were caught and released with implanted archival tags in the eastern equatorial Pacific Ocean during April 2004. Six skipjack tuna were recaptured, and 9.3 to 10.1...

Decline in condition of northern bluefin tuna (Thunnus thynnus) in the Gulf of Maine.
July 1, 2007... Abstract--The northern bluefin tuna (Thunnus thynnus) is a highly mobile apex predator in the Gulf of Maine. Despite current stock assessments that indicate historically high abundance of its main prey, Atlantic herring (Clupea harengus),...

Geographic and seasonal variations in maturation and growth of female Pacific cod (Gadus macrocephalus) in the Gulf of Alaska and Bering Sea.
July 1, 2007... Abstract--This study investigates the temporal stability of length- and age-at-maturity estimates for female Pacific cod (Gadus macrocephalus) in the Gulf of Alaska and eastern Bering Sea. Females reached 50% maturity ([A.sub.50]) at 4.4 years...

Interactions between marine mammals and pelagic longline fishing gear in the U.S. Atlantic Ocean between 1992 and 2004.
July 1, 2007... Abstract--The U.S. East Coast pelagic longline fishery has a history of interactions with marine mammals, where animals are hooked and entangled in longline gear. Pilot whales (Globicephala spp.) and Risso's dolphin (Grampus griseus) are the...

Changes in egg production of the western rock lobster (Panulirus cygnus) associated with appendage damage.
July 1, 2007... Abstract--Data collected during fishery-independent sampling programs were used to examine the impact of appendage damage (indicated by lost or regenerated legs and antennae) on the reproductive output of female western rock lobster (Panulirus...

Diversity of estuarine movements of striped bass (Morone saxatilis): a synoptic examination of an estuarine system in southern New Jersey.
July 1, 2007... Abstract--We determined the distribution of multiple (n=68; 508-978 mm total length [TL]) striped bass (Morone saxatilis) along the estuarine salinity gradient in the Mullica River-Great Bay in southern New Jersey over two years to determine...

Microsatellite multiplex panels for genetic studies of gray snapper (Lutjanus griseus) and lane snapper (Lutjanus synogris).
July 1, 2007... Microsatellites are codominantly inherited nuclear-DNA markers (Wright and Bentzen, 1994) that are now commonly used to assess both stock structure and the effective population size of exploited fishes (Turner et al., 2002; Chistiakov et al.,...

Effect of towing speed on retention of zooplankton in bongo nets.
July 1, 2007... Long-term time series of zooplankton data provide invaluable information about the fluctuations of species abundance and the stability of marine community structure. These data have demonstrated that environmental variability have a profound...