scholarly journals Trends in Forage Fish Populations in Northern Hudson Bay since 1981, as Determined from the Diet of Nestling Thick-billed Murres, Uria lomvia

ARCTIC ◽  
2003 ◽  
Vol 56 (3) ◽  
Author(s):  
Anthony J. Gaston ◽  
Kerry Woo ◽  
J. Mark Hipfner
Keyword(s):  
Fish Populations ◽  
Forage Fish ◽  
Hudson Bay ◽  
Uria Lomvia

The influence of forage fish abundance on the aggregation of Gulf of Maine Atlantic cod (Gadus morhua) and their catchability in the fishery

2014 ◽  
Vol 71 (9) ◽  
pp. 1349-1362 ◽  
Author(s):  
David E. Richardson ◽  
Michael C. Palmer ◽  
Brian E. Smith
Keyword(s):  
Gadus Morhua ◽  
Gulf Of Maine ◽  
Atlantic Cod ◽  
Distribution Patterns ◽  
Fish Populations ◽  
Dependent Data ◽  
Forage Fish ◽  
Catch Per Unit Effort ◽  
Sand Lance ◽  
Unit Effort

Shifts in the distribution and aggregation patterns of exploited fish populations can affect the behavior and success of fishermen and can complicate the interpretation of fisheries-dependent data. Starting in 2006, coinciding with an increase in sand lance (Ammodytes spp.) abundance, Gulf of Maine Atlantic cod (Gadus morhua) concentrated on Stellwagen Bank, a small (405 km2) underwater plateau located in the southwestern portion of the larger (52 461 km2) stock area. The cod fishery in turn concentrated on Stellwagen Bank. Specifically, the proportion of Gulf of Maine cod landings caught in a single 10-minute square area (260 km2) encompassing the tip of Stellwagen Bank increased from 12% in 2005 to 45% in 2010. An increase in landings per unit effort in the fishery coincided with the concentration of the fleet on Stellwagen Bank. Overall, both fisheries-independent and fisheries-dependent data indicate that an increase in sand lance abundance resulted in cod aggregating in a small and predictable area where they were easily caught by the fishery. More broadly, this work illustrates how changes in the distribution patterns of fish and fisherman can decouple trends in abundance and fisheries catch per unit effort.

The effect of ice conditions in northern Hudson Bay on breeding by Thick-billed Murres (Uria lomvia)

1998 ◽  
Vol 76 (3) ◽  
pp. 480-492 ◽  
Author(s):  
Anthony J. Gaston ◽  
Mark Hipfner
Keyword(s):  
Hudson Bay ◽  
Uria Lomvia ◽  
Ice Conditions

Long-Term Changes in the Macrobenthos of Southern Lake Michigan

1987 ◽  
Vol 44 (3) ◽  
pp. 515-524 ◽  
Author(s):  
Thomas F. Nalepa
Keyword(s):  
Lake Michigan ◽  
Fish Populations ◽  
Forage Fish ◽  
Future Trends ◽  
Sampling Depth ◽  
Benthic Survey ◽  
Comprehensive Survey ◽  
Long Term Trends

A benthic survey of 40 stations in southern Lake Michigan in 1980–81 was compared with results of studies conducted in the mid-1960's to evaluate long-term trends in populations. The three major benthic groups, Pontoporeia, oligochaetes, and sphaeriids, were significantly more abundant in 1980–81. Compared with the most comprehensive survey (conducted in 1964–67), Pontoporeia increased two- to fivefold at depths less than 50 m, but did not increase at depths greater than 50 m. Oligochaetes increased two- to threefold regardless of sampling depth, while sphaeriids increased twofold at depths less than 50 m but decreased somewhat at depths greater than 50 m. Although oligochaete abundances increased, overall shifts in species composition were not apparent. Changes in abundances of Pontoporeia may have been related to shifts in predation pressure from forage fish populations, but increased oligochaete abundances can likely be related to increased enrichment between the two sampling periods. Although apparent improvements in the water quality of Lake Michigan since the mid-1970's were not yet reflected by benthic populations in 1980–81, continued monitoring of the benthos should provide a useful indicator of future trends.

Modeled Effects of Double-Crested Cormorant Predation on Simulated Reservoir Sport and Forage Fish Populations in Oklahoma

2000 ◽  
Vol 20 (1) ◽  
pp. 180-191 ◽  
Author(s):  
Robert L. Simmonds ◽  
Alexander V. Zale ◽  
David M. Leslie
Keyword(s):  
Fish Populations ◽  
Forage Fish

scholarly journals Sonar imaging surveys fill data gaps in forage fish populations in shallow estuarine tributaries

2020 ◽  
Vol 226 ◽  
pp. 105520
Author(s):  
Katelynn M. Lankowicz ◽  
Hongsheng Bi ◽  
Dong Liang ◽  
Chunlei Fan
Keyword(s):  
Fish Populations ◽  
Forage Fish ◽  
Data Gaps ◽  
Sonar Imaging

The effect of ice conditions in northern Hudson Bay on breeding by Thick-billed Murres (Uria lomvia)

1998 ◽  
Vol 76 (3) ◽  
pp. 480-492 ◽  
Author(s):  
Anthony J Gaston ◽  
Mark Hipfner
Keyword(s):  
Body Mass ◽  
Egg Size ◽  
Annual Variation ◽  
Ice Cover ◽  
Hudson Bay ◽  
Uria Lomvia ◽  
Marine Food Web ◽  
Adult Body Mass ◽  
Ice Conditions ◽  
Marine Food

We compared annual indices of breeding by Thick-billed Murres, Uria lomvia, at a colony in northern Hudson Bay with annual variation in the extent of sea-ice cover during May and June, the period when birds arrive and initiate breeding. Greater ice cover was associated with delayed breeding and lower attendance rates at the colony during the early incubation period (late June). We detected no effect on egg size, reproductive success, or adult body mass. The extent of ice cover in May was positively correlated with the proportion of Arctic cod fed to nestlings, and in June with the proportion of capelin in the rest of the diet. There was a positive correlation between the proportion of capelin in the chick diet and chick body mass at 14 days of age. We attribute the delay in laying during years of heavy ice cover to the reduced area available for foraging close to the colony. Prolonged persistence of ice, though delaying the onset of laying, may benefit the birds later in the season, as they forage preferentially in the vicinity of ice. We suggest that the strong relationships we observed between the extent of ice cover and aspects of the breeding biology of Thick-billed Murres may apply to other Arctic-nesting seabirds and may reflect conditions affecting the entire marine food web.

Organohalogen contaminants and total mercury in forage fish preyed upon by thick-billed murres in northern Hudson Bay

2014 ◽  
Vol 78 (1-2) ◽  
pp. 258-266 ◽  
Author(s):  
Birgit M. Braune ◽  
Anthony J. Gaston ◽  
Kyle H. Elliott ◽  
Jennifer F. Provencher ◽  
Kerry J. Woo ◽  
...  
Keyword(s):  
Total Mercury ◽  
Forage Fish ◽  
Hudson Bay

scholarly journals Collapse and recovery of forage fish populations prior to commercial exploitation

2017 ◽  
Vol 44 (4) ◽  
pp. 1877-1885 ◽  
Author(s):  
S. McClatchie ◽  
I. L. Hendy ◽  
A. R. Thompson ◽  
W. Watson
Keyword(s):  
Fish Populations ◽  
Forage Fish ◽  
Commercial Exploitation

Is there enough zooplankton to feed forage fish populations off Peru? An acoustic (positive) answer

2011 ◽  
Vol 91 (4) ◽  
pp. 360-381 ◽  
Author(s):  
Michael Ballón ◽  
Arnaud Bertrand ◽  
Anne Lebourges-Dhaussy ◽  
Mariano Gutiérrez ◽  
Patricia Ayón ◽  
...  
Keyword(s):  
Positive Answer ◽  
Fish Populations ◽  
Forage Fish
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