scholarly journals Stable d13C and d18O isotopes in otoliths of haddock Melanogrammus aeglefinus from the northwest Atlantic Ocean

2001 ◽  
Vol 216 ◽  
pp. 223-233 ◽  
Author(s):  
GA Begg ◽  
CR Weidman
Keyword(s):  
Atlantic Ocean ◽  
Melanogrammus Aeglefinus ◽  
Northwest Atlantic ◽  
Haddock Melanogrammus Aeglefinus

Recruitment to Northwest Atlantic Cod (Gadus morhua) and Haddock (Melanogrammus aeglefinus) Stocks: Influence of Stock Size and Climate

1987 ◽  
Vol 44 (1) ◽  
pp. 26-39 ◽  
Author(s):  
J. Anthony Koslow ◽  
Keith R. Thompson ◽  
William Silvert
Keyword(s):  
Large Scale ◽  
Gadus Morhua ◽  
Reproductive Output ◽  
Atlantic Cod ◽  
Low Frequency ◽  
Melanogrammus Aeglefinus ◽  
Northwest Atlantic ◽  
Biological Variables ◽  
Low Frequency Variability ◽  
Haddock Melanogrammus Aeglefinus

Year-class success of both Atlantic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) stocks in the northwest Atlantic exhibits large-scale coherence and low-frequency variability with apparent periodicities of 10–20 yr. Several physical and biological variables in the region exhibit similar large-scale coherence and apparent periodicity. Multiple regression analysis indicates that year-class success in northwest Atlantic cod stocks tends to be associated with large-scale meteorological patterns and offshore winds. Recruitment to most haddock stocks from the Scotian Shelf to Georges Bank is negatively associated with abundance of 0-group mackerel, which may be due to predation over winter and/or to a combination of environmental features including sea-surface temperature, large-scale atmospheric pressure systems, and freshwater outflows. Statistical analyses often did not define a unique set of variables that best predicted fishery recruitment due to widespread intercorrelations among environmental processes and the likelihood that not all relevant processes entered directly into the analyses. There is little evidence that stock reproductive output during the study period was significantly related to year-class success.

Analysis of Haddock (Melanogrammus aeglefinus) sounds recorded in the Northwest Atlantic

2018 ◽  
Vol 143 (3) ◽  
pp. 1899-1899
Author(s):  
Xavier Mouy ◽  
Rodney A. Rountree ◽  
Katie A. Burchard ◽  
Francis Juanes ◽  
Stan E. Dosso
Keyword(s):  
Melanogrammus Aeglefinus ◽  
Northwest Atlantic ◽  
Haddock Melanogrammus Aeglefinus

Microsatellite evaluation of haddock (Melanogrammus aeglefinus) stocks in the northwest Atlantic Ocean

2001 ◽  
Vol 58 (5) ◽  
pp. 982-990 ◽  
Author(s):  
Christopher Lage ◽  
Maureen Purcell ◽  
Michael Fogarty ◽  
Irv Kornfield
Keyword(s):  
Melanogrammus Aeglefinus ◽  
Georges Bank ◽  
Effective Number ◽  
Scotian Shelf ◽  
Genetic Structuring ◽  
Northwest Atlantic ◽  
Spawning Aggregations ◽  
The Impact ◽  
Significant Genetic Divergence ◽  
Haddock Melanogrammus Aeglefinus

The goal of this study was to gain insight about the impact of intensive fishing on a single haddock (Melanogrammus aeglefinus) stock, and examine the genetic structuring of spatially discrete spawning aggregations in the northwest Atlantic. We analyzed genetic change at four microsatellite loci for Georges Bank haddock over a 40-year time span in which significant changes in demographics and abundances have occurred in the population. Allelic diversities have changed little, indicating that, although the commercial fishery has collapsed, stock sizes have remained large enough to insulate against major reductions in genetic variation due to drift. Results indicate significant genetic divergence among decadally separated samples. Potential causes for these differences include admixture from other spawning regions, fluctuations in the effective number of spawners contributing to a single spawning event, drift, or a combination of these. Examination of discrete spawning aggregations from Georges Bank, Browns Bank, the Scotian Shelf, and Nantucket Shoals indicated significant differences among stocks. Genetic distance based measures supported the clustering of Scotian Shelf, Browns Bank, and Georges Bank haddock to the exclusion of Nantucket Shoals haddock. Haddock spawning on Nantucket Shoals may be genetically discrete from other haddock populations in the northwest Atlantic.

Maternal and seasonal differences in egg sizes and spawning activity of northwest Atlantic haddock (Melanogrammus aeglefinus) in relation to body size and condition

2004 ◽  
Vol 61 (11) ◽  
pp. 2097-2110 ◽  
Author(s):  
Edward A Trippel ◽  
Steven RE Neil
Keyword(s):  
Body Weight ◽  
Body Size ◽  
Egg Production ◽  
Condition Factor ◽  
Fertilization Rate ◽  
Melanogrammus Aeglefinus ◽  
Northwest Atlantic ◽  
Larval Production ◽  
Egg Diameter ◽  
Haddock Melanogrammus Aeglefinus

Egg and larval production of 22 captive spawning pairs of northwest Atlantic haddock (Melanogrammus aeglefinus) were monitored. Females spawned an average of nine egg batches (range 3–16) with a mean batch fecundity of 60 000 eggs and mean total fecundity of 535 000 eggs. Mean spawning duration was 37 days with a mean batch interval of 5.4 days. In multiple linear regression, male Fulton's condition factor (range 1.10–1.55) and mean batch interval explained 56% of variation in fertilization rate (33% and 23%, respectively). Seasonal composite egg diameter spanned 1.37–1.53 mm among females. Mean egg diameter within females declined seasonally by an average of 10.4% (37% by volume). Females produced 46 larvae per gram body weight. Body weight was the single best predictor of fecundity (r2 = 0.57), with Fulton's condition factor (range 1.04–1.76) explaining no significant additional variation over length or weight. Length and condition explained 39% of variation in seasonal composite egg diameter (22% and 17%, respectively) and body weight independently explained 32%. Sex-specific parental condition and body size acted through large egg size and elevated fertility to enhance reproductive output. Male spawning success was more sensitive than egg production to changes in condition.

Spawning Time and Egg Stage Duration in Northwest Atlantic Haddock (Melanogrammus aeglefinus) Stocks with Emphasis on Georges and Browns Bank

1989 ◽  
Vol 46 (S1) ◽  
pp. s68-s81 ◽  
Author(s):  
Fred. H. Page ◽  
Kenneth T. Frank
Keyword(s):  
Water Temperature ◽  
Annual Variation ◽  
Incubation Temperature ◽  
Temperature Cycle ◽  
Melanogrammus Aeglefinus ◽  
Georges Bank ◽  
Stage Duration ◽  
Northwest Atlantic ◽  
Spawning Time ◽  
Haddock Melanogrammus Aeglefinus

Literature data was used to examine the hypothesis that variation in the spawning time, defined as the peak in egg abundance, of Northwest Atlantic haddock (Melanogrammus aeglefinus) stocks is explained by water temperature and to derive calibration curves relating incubation temperature to haddock egg stage duration. Spawning times occurred, on average, in March on Georges Bank, late April/early May on Browns Bank, and in June/July on the Grand Banks. Temperatures at peak spawning overlapped considerably but differed in terms of phase in the annual temperature cycle. Inter-annual variation in spawning time of Georges Bank haddock varied by 3 mo and was significantly correlated with water temperature. Browns Bank haddock spawning varied by only 1 mo and was not correlated with water temperature. Egg stage duration varied with incubation temperature. A power curve best described the relationship and was used to estimate the historical, annual variation in haddock egg stage duration which ranged from 10 to 20 d (mean = 16 d) on Georges Bank and from 10 to 30 d (mean = 18 d) on Browns Bank during 1946–80. Collectively, our analysis calls into question the generality of the assumption of constant spawning times for marine fish species and provides essential information for field measurement of haddock egg production rates, mortality, advection, and dispersal.

Benthic Boundary Layer Macrofauna of Browns Bank, Northwest Atlantic, as Potential Prey of Juvenile Benthic Fish

1992 ◽  
Vol 49 (1) ◽  
pp. 91-98 ◽  
Author(s):  
D. J. Wildish ◽  
A. J. Wilson ◽  
B. Frost
Keyword(s):  
Boundary Layer ◽  
Fish Larvae ◽  
Quantitative Description ◽  
Melanogrammus Aeglefinus ◽  
Benthic Boundary Layer ◽  
Northwest Atlantic ◽  
Sediment Flow ◽  
Sediment Interface ◽  
Haddock Melanogrammus Aeglefinus

A first quantitative description is provided of the drifting or swimming macrofauna present within the benthic boundary layer (BBL) over the hard sediments of Browns Bank in the northwest Atlantic. Major categories of identified animals include drift epi- or infauna, zooplankters, fish larvae and eggs, and suprabenthic animals. Suprabenthic amphipods were good indicators of the type of sediment/flow environment that they were associated with. Although zooplanktonic copepods were by far the most abundant and suprabenthos the most diverse group of the BBL macrofauna, they appear to be ignored as a source of food by juvenile haddock (Melanogrammus aeglefinus), which are known to feed on prey classified herein either as in situ, or drifted, epi- or infauna. Unfortunately, the BBL sled used in our study could not sample animals at < 33 cm from the sediment–water interface. Our results imply that juvenile haddock feed either directly on animals living in, or at the sediment interface, or on drifting animals present within the BBL at heights < 33 cm above the bottom

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