Results 71 to 80 of about 931 (142)

Validity of otolith age determinations for jack mackerel, Trachurus symmetricus, from the Southern California Bight area

open access: yes, 1974
The purpose of this study was to ascertain the validity of agedeterminations using otoliths of jack mackerel. The study consisted of two parts: (1)otoliths were examined for seasonal changes in the hyaline and opaque zones at the edges of otoliths and (2)a dominant year class was followed through consecutive years noting marginal zone changes. (13pp.)
Knaggs, Eric H., Sunada, John S.
openaire   +1 more source

'El Niño' Effects and Biomass Endogeneity in a Harvest Function: The Chilean Jack Mackerel Fishery [PDF]

open access: yes
The main goal of this paper consists in estimating the input parameters of an annual harvest function for the Chilean jack mackerel stock; particularly, the effects of biomass on catch.
Claudio Agostini   +2 more
core  

Status of Pacific Mackerel spawning population, 1976 [PDF]

open access: yes, 1976
In order to initiate a fishery for the Pacific mackerel, Scomber japonicus, it is required that the spawning biomass be determined to have reached 10,000 short tons.
Klingbeil, Richard A.
core  

Southern California independent sport fishing survey Quarterly Report no. 9 [PDF]

open access: yes, 1977
During the July 1 - September 30, 1977 quarter, 29 launch ramps, hoists, and boat rental locations were sampled 380 times. During the sample days 25,256 anglers and 1,445 divers were interviewed.
Wine, Vickie L.
core   +2 more sources

Effects of the Santa Barbara, Calif., Oil Spill on the Apparent Abundance of Pelagic Fishery Resources [PDF]

open access: yes, 1992
Many studies have been made of the effects of oil on marine invertebrates, plants (marine algae and phytoplankton), and vertebrates such as seabirds and marine mammals.
Squire, Jr. , James L.
core  

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