Factors linking Pacific herring (Clupea pallasi) productivity and the spring plankton bloom in the Strait of Georgia, British Columbia, Canada

2013 ◽  
Vol 115 ◽  
pp. 103-110 ◽  
Author(s):  
J.F. Schweigert ◽  
M. Thompson ◽  
C. Fort ◽  
D.E. Hay ◽  
T.W. Therriault ◽  
...  
Keyword(s):  
British Columbia ◽  
Pacific Herring ◽  
Strait Of Georgia ◽  
Clupea Pallasi ◽  
Plankton Bloom

Tagging of Pacific herring Clupea pallasi from 1936–1992: a review with comments on homing, geographic fidelity, and straying

2001 ◽  
Vol 58 (7) ◽  
pp. 1356-1370
Author(s):  
D E Hay ◽  
P B McCarter ◽  
K S Daniel
Keyword(s):  
British Columbia ◽  
Geographic Area ◽  
Coastal Areas ◽  
High Fidelity ◽  
Pacific Herring ◽  
Biological Processes ◽  
Electronic Database ◽  
Strait Of Georgia ◽  
Clupea Pallasi ◽  
Small Areas

Nearly 1.6 million tagged herring (Clupea pallasi) were released in two separate programs (1936–1967 and 1979–1992) in British Columbia. Several thousand tags were released in each of 955 release sessions. Over 85% of the release sessions had subsequent recoveries. Almost 43 000 tags were recovered over all years. We re-assembled the tagging data into an electronic database, geo-referenced all tag release and recovery data, analysed spatial movements, and estimated straying and fidelity rates. The analyses do not wholly support the conclusions of previous work indicating high homing rates to local coastal areas. Estimates of fidelity, defined as the proportion of tags recovered in the same area as released, varied with the size of the geographic area used in the analyses. Fidelity rates are high for large areas, such as the Strait of Georgia (~10 000 km2), but lower for small geographical areas, such as inlets or bays (~100 km2). High fidelity is not necessarily evidence for "homing." Homing and fidelity are different biological processes and tagging cannot necessarily distinguish between them. Although fidelity rates for small areas are generally low, there are exceptions that may be evidence for the existence of biologically distinct populations in certain areas.

A Statistical Examination of Anisakis Larvae (Nematoda) in Herring (Clupea pallasi) of the British Columbia Coast

1955 ◽  
Vol 12 (4) ◽  
pp. 571-592 ◽  
Author(s):  
Yvonne M. M. Bishop ◽  
Leo Margolis
Keyword(s):  
British Columbia ◽  
West Coast ◽  
Maximum Level ◽  
Vancouver Island ◽  
First Year ◽  
Intensity Of Infection ◽  
The West ◽  
Strait Of Georgia ◽  
Clupea Pallasi ◽  
First Year Of Life

The presence of larval Anisakis in British Columbia herring was examined during the winter fisheries of 1950–51 and 1951–52. In the commercial catches in the Strait of Georgia the incidence was found to be between 80 and 90%. In Hecate Strait, on the west coast of Vancouver Island and in the mainland coastal area of Queen Charlotte Sound it was between 90 and 100%. The intensity of infection varied greatly in different fishing areas (i.e. in different herring populations). Generally, the maximum level of infection occurred in the Queen Charlotte Sound coastal regions, and decreased both north and south of this area. Fish on the west coast of Vancouver Island were more heavily infected than those on the east coast (Strait of Georgia). The level of infection increased with age, I-year fish (i.e. fish in their first year of life) being uninfected. The intensity of infection remained constant throughout the winter for any particular age and area and was the same for both sexes. In most areas the level of infection was a little lower in 1951–52 than in 1950–51.

Comparison of Some Life History Characteristics of Pacific Herring (Clupea pallasi) from the Canadian Pacific Ocean and Beaufort Sea

1993 ◽  
Vol 50 (5) ◽  
pp. 964-971 ◽  
Author(s):  
R. W. Tanasichuk ◽  
A. H. Kristofferson ◽  
D. V. Gillman
Keyword(s):  
Pacific Ocean ◽  
Beaufort Sea ◽  
Larval Period ◽  
Pacific Herring ◽  
Strait Of Georgia ◽  
Clupea Pallasi ◽  
Surplus Energy ◽  
Ripe Ovary ◽  
Using Data ◽  
Sea Fish

We compared several growth and reproductive characteristics of Pacific herring (Clupea pallasi) from the Canadian Pacific Ocean and Beaufort Sea using data for 2310 fish gillnetted in the northern Strait of Georgia or near Tuktoyaktuk, N.W.T., over the 1985 spawning season. Weight-at-age was similar but Beaufort Sea fish were longer-at-age. Total weight-at-length was significantly greater for Strait of Georgia herring because their size-specific ripe ovary weights were 2.1 times greater. We attributed differences in growth and surplus energy allocation to adult instantaneous mortality rates being 1.8 times higher for Strait of Georgia herring. Size-specific ripe egg weight was 30% smaller in Beaufort Sea herring presumably because warmer sea temperatures over the larval period resulted in a higher mortality rate. Weight-specific fecundity was 1.5 times greater in Strait of Georgia fish. Ovarian growth rates near spawning were lower in Beaufort Sea herring because they mature in colder water.

Tagging along: association among individual Pacific herring (Clupea pallasi) revealed by tagging

2002 ◽  
Vol 59 (12) ◽  
pp. 1960-1968 ◽  
Author(s):  
D E Hay ◽  
S M McKinnell
Keyword(s):  
British Columbia ◽  
Oncorhynchus Mykiss ◽  
Statistical Method ◽  
Positive Association ◽  
Commercial Fisheries ◽  
Pacific Herring ◽  
Steelhead Trout ◽  
Similar Question ◽  
Clupea Pallasi ◽  
External Anchor

More than 570 000 Pacific herring (Clupea pallasi) were tagged with external anchor tags during 429 tag release sessions between 1979 and 1992. Individually numbered tags were released in quantities of 1000–2000 at a time and recovered from commercial fisheries. Often several tags were recovered at the same time and place, and some recoveries occurred as "matches", where two or more tags from a single release session were recovered together. We tested the hypothesis that the frequency of matching tag recoveries occurred by chance through random mixing of tagged herring before their recapture during fishing operations. The alternative is nonrandom, positive association among tagged individuals that persisted through time and during migrations. We used a statistical method developed to address a similar question in steelhead trout (Oncorhynchus mykiss). In separate tests, we examined tag recovery data from migratory stocks in five major regions of the British Columbia. The results indicate nonrandom association of herring for periods of 6 months to several years and through migrations over considerable distances.

Modelling Pelagic Fish and Plankton Trophodynamics off Southwestern Vancouver Island, British Columbia

1994 ◽  
Vol 51 (8) ◽  
pp. 1737-1751 ◽  
Author(s):  
Clifford L. K. Robinson ◽  
Daniel M. Ware
Keyword(s):  
British Columbia ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Coastal Upwelling ◽  
Squalus Acanthias ◽  
Pacific Herring ◽  
Fish Production ◽  
Clupea Pallasi ◽  
Merluccius Productus ◽  
Arrival Timing

A trophodynamics model is used to estimate annual plankton and fish production for the southern British Columbia continental shelf during 1985–89. The model describes the feeding interactions among diatoms, copepods, euphausiids, juvenile and adult Pacific herring (Clupea pallasi), Pacific hake (Merluccius productus), chinook salmon (Oncorhynchus tshawytscha), and spiny dogfish (Squalus acanthias) and is forced by empirical seasonal patterns in upwelling, sea surface temperature, and solar radiation. The most important simulation results are that (1) there is an imbalance between fish consumption and euphausiid production during the summer upwelling season, (2) the biomass and arrival timing of migratory hake significantly influence plankton and fish production, and (3) about 11% of the 332 g C∙m−2∙yr−1 annual diatom production is transferred to copepods and euphausiids and 1.0% of the diatom production to fish, while 27.5% of the 11.9 g C∙m−2∙yr−1 euphausiid production is consumed by herring and hake. The high plankton and fish production on the southern British Columbia shelf is comparable with other productive coastal upwelling regions.

Aggregative response of Harlequin Ducks to herring spawning in the Strait of Georgia, British Columbia

2003 ◽  
Vol 81 (3) ◽  
pp. 504-514 ◽  
Author(s):  
Michael S Rodway ◽  
Heidi M Regehr ◽  
John Ashley ◽  
Peter V Clarkson ◽  
R Ian Goudie ◽  
...  
Keyword(s):  
British Columbia ◽  
Late Winter ◽  
Strait Of Georgia ◽  
Clupea Pallasi ◽  
Lack Of Information ◽  
Trade Offs ◽  
Harlequin Ducks ◽  
Aggregative Response ◽  
Conservation Concern ◽  
Spawning Sites

We determined the scale of aggregative response of Harlequin Ducks (Histrionicus histrionicus) to seasonally and locally superabundant prey at Pacific herring (Clupea pallasi) spawning sites in the northern Strait of Georgia, British Columbia, in 1995–2002. Aggregations of 3400–5500 birds gathered at a small number of sites along the same 8-km stretch of shoreline each year that spawn was available there. Aggregations occurred in only a small fraction of the habitat area where spawn was available. Duration of stay at spawning sites averaged 2–3 weeks and many birds returned to their wintering grounds afterwards. Birds moving to spawning sites represented 55–87% of the total wintering population. The proportion of local wintering populations that moved to spawning sites was negatively related to the distance they had to travel, and few birds travelled farther than 80 km. The decline in proportions moving with increasing distance suggests that more distant individuals may be constrained by a lack of information or that there are trade-offs between the benefits of exploiting spawn and the costs of movement. This raises a conservation concern because the temporal and geographic range of herring spawning in British Columbia is contracting and some wintering waterbird populations may be losing access to this important late-winter food.

scholarly journals Sighting rates and prey of Minke Whales (Balaenoptera acutorostrata) and other cetaceans off Cormorant Island, British Columbia

2019 ◽  
Vol 133 (2) ◽  
pp. 144
Author(s):  
Jared R. Towers ◽  
Christie J. McMillan ◽  
Rebecca S. Piercey
Keyword(s):  
British Columbia ◽  
Pacific Herring ◽  
Balaenoptera Acutorostrata ◽  
Sand Lance ◽  
Clupea Pallasi ◽  
Use Patterns ◽  
Minke Whales ◽  
Ammodytes Personatus ◽  
Pacific Sand Lance ◽  
Lunge Feeding

From June to August 2012, we conducted over 500 h of visual surveys from Cormorant Island, British Columbia, to determine behaviour and habitat use patterns of nearby cetaceans. Seven species were documented, but Minke Whales (Balaenoptera acutorostrata) were by far the most common and were observed lunge feeding at the surface on 15 occasions. In addition, this species was documented surface lunge feeding on Pacific Herring (Clupea pallasi) and Pacific Sand Lance (Ammodytes personatus) on 32 occasions during vessel-based cetacean surveys around Cormorant Island between 2010 and 2014. Although Minke Whales are relatively uncommon in British Columbia, these results indicate that they can regularly be found in specific feeding areas during the summer.

Offshore Distribution of Pacific Herring (Clupea pallasi) on Basis of Records from Fur Seal Stomachs

1971 ◽  
Vol 28 (10) ◽  
pp. 1663-1665
Author(s):  
F. H. C. Taylor
Keyword(s):  
British Columbia ◽  
Continental Shelf ◽  
Columbia River ◽  
Callorhinus Ursinus ◽  
Pacific Herring ◽  
Clupea Pallasi ◽  
Barkley Sound ◽  
Fur Seal

An examination of stomachs of fur seal (Callorhinus ursinus) taken off the coast of southern British Columbia and Washington from 1958 to 1969 indicated that Pacific herring (Clupea pallasi) were confined mainly to the continental shelf. Herring were most numerous in fur seal stomachs off Barkley Sound. Few occurred north of Cape Cook or from Cape Flattery south to the Columbia River. None were found from seals taken near the Cobb Sea-mount.

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