A workshop was held in Santa Barbara, California,
associated with assessing the populations of nekton
animals such as squids, shrimps and fishes. Sessions
four major methods of assessing nekton populations:
(1) Net collections
(2) Acoustics
(3) Egg/larval surveys
(4) Visual methods, remote sensing and feeding habit studies
An attempt was...
The School of Oceanography, Oregon State University, initiated a study during the spring of 1984 to investigate the utilization of Netarts Bay by juvenile churn salmon. Specific objectives the first year were to determine: 1) the relative numbers of hatchery arid wild churn salmon, 2) the nursery areas utilized by...
Thirteen steelhead trout (Salmo gairdneri) with coded-wire tags (CWT's)
were captured in gillnets fished by the Oshoro-Maru in the Gulf of Alaska along
145°W in 1980 and 1981 and along 180° in 1981. These fish originated from hatcheries
in Oregon, Washington and Idaho, U.S.A., and British Columbia, Canada. About
7%...
Dover and rex sole larvae attain an exceptionally large size and have a long pelagic life. Dover sole larvae (9-65 mm standard length) were collected in mid-water trawls and plankton nets during all months of the year. Judging from growth of larvae and occurrence in bottom trawls of recently metamorphosed...
During July 1970, albacore boats trolling surface jigs (jig boats) had record catches
in an area off the mouth of the Columbia River. The jig fishery declined suddenly in
late July and was poor throughout the remainder of the summer. No obvious oceanographic
changes were correlated with these drastic changes...
The 1982-83 El Nino event in the northeastern Pacific has been
associated with significant changes In sea temperatures, vertical
thermal structure, coastal currents and upwelling (this volume).
Such physical changes may affect the species composition, abundance
or availability of fishes and other nektonic animals in a variety
of ways.
This paper reviews some of the distributional features of vertically migrating micronekton
off Oregon; describes a new, conducting-cable, midwater-trawl system using an eight-net,
opening-closing cod-end unit; and gives some preliminary results on trawl catches relative to
sound-scattering layers.
A variable complex of organisms, including euphausiids, a sergestid shrimp, and mesopelagic...
