Age-related and seasonal changes in haddock Melanogrammus aeglefinus distribution: implications for spatial management

2016 ◽  
Vol 553 ◽  
pp. 203-217 ◽  
Author(s):  
A Asjes ◽  
JM González-Irusta ◽  
PJ Wright
Keyword(s):  
Seasonal Changes ◽  
Melanogrammus Aeglefinus ◽  
Age Related ◽  
Spatial Management ◽  
Haddock Melanogrammus Aeglefinus

Reproductive Biology of Southwest Scotian Shelf Haddock (Melanogrammus aeglefinus)

1989 ◽  
Vol 46 (S1) ◽  
pp. s153-s170 ◽  
Author(s):  
K. G. Waiwood ◽  
M.-I. Buzeta
Keyword(s):  
Body Weight ◽  
Reproductive Biology ◽  
Seasonal Changes ◽  
Maximum Size ◽  
Melanogrammus Aeglefinus ◽  
Maturation Stage ◽  
Peak Activity ◽  
Gonad Weight ◽  
Scotian Shelf ◽  
Haddock Melanogrammus Aeglefinus

Information on the reproductive biology of Southwest Scotian Shelf haddock (Melanogrammus aeglefinus) (NAFO Division 4X) is presented including geographic distribution by maturation stage, timing of maturation, seasonal changes in gonad weight, spawning distribution in relation to environmental factors, and fecundity at length, weight, and age. Haddock were found to spawn on Browns, Baccaro, LaHave, and Roseway Banks over sand/gravel substrates. Spawning fish were found in a narrower and colder temperature range than were fish of other maturity stages. Spawning fish were found from April to August with peak activity occurring from April to June. Testes peaked in weight in February and March when they accounted for 1–2.2% of body weight while ovaries reached their maximum size (3.1–12.5% of body weight) from late March to mid-May. The length at 50% maturity varied over the period 1970–85 and these changes were correlated with changes in population biomass. There were no significant differences in fecundity/length relationships with area or year (1983–86) but fecundity for a given size decreased over the spawning season.

Recent Growth, Biochemical Composition and Prey Field of Larval Haddock (Melanogrammus aeglefinus) and Atlantic Cod (Gadus morhua) on Georges Bank

1987 ◽  
Vol 44 (1) ◽  
pp. 14-25 ◽  
Author(s):  
L. J. Buckley ◽  
R. G. Lough
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Dry Weight ◽  
Melanogrammus Aeglefinus ◽  
Good Growth ◽  
Georges Bank ◽  
Larval Population ◽  
Prey Biomass ◽  
Recent Growth ◽  
Haddock Melanogrammus Aeglefinus

A transect across southern Georges Bank in May 1983 showed higher levels of available prey for haddock (Melanogrammus aeglefinus) and cod (Gadus morhua) larvae at two stratified sites than at a well-mixed site. At the stratified sites, prey biomass was high (30–300 μg dry wt∙L−1) near the surface above the thermocline; values were lower and more uniform with depth (10–30 μg dry wt∙L−1) at the well-mixed site. Larval population centers generally coincided with prey biomass vertically. Recent growth in dry weight of haddock larvae as estimated by RNA–DNA ratio analysis was higher at the stratified sites (8–13%∙d−1) than at the well-mixed site (7%∙d−1). Larvae appeared to be in excellent condition at the stratified sites, but up to 50% of haddock larvae from the well-mixed site had RNA–DNA ratios in the range observed for starved larvae in the laboratory. Cod collected at the same site were in better condition and growing faster than haddock. The data support the hypotheses that (1) stratified conditions in the spring favor good growth and survival of haddock larvae and (2) cod larvae are better adapted to grow and survive in well-mixed waters at lower levels of available food than haddock larvae.

Distinguishing Between One-Day-Old Cod (Gadus morhua) and Haddock (Melanogrammus aeglefinus) Eggs by Gas Chromatography and SIMCA Pattern Recognition

1985 ◽  
Vol 42 (11) ◽  
pp. 1823-1826 ◽  
Author(s):  
H. Knutsen ◽  
E. Moksnes ◽  
N. B. Vogt
Keyword(s):  
Fatty Acids ◽  
Pattern Recognition ◽  
Gas Chromatography ◽  
Multivariate Analysis ◽  
Methyl Ester ◽  
Gadus Morhua ◽  
Melanogrammus Aeglefinus ◽  
One Step ◽  
High Resolution Gas Chromatography ◽  
Haddock Melanogrammus Aeglefinus

Single cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) eggs were acid hydrolized. All the fatty acids were liberated and converted to methyl ester in a one-step reaction. The nonpolar hexane extract was analyzed by high resolution gas chromatography (HRGC). Selected peaks, occurring in both types of samples and in all chromatograms, were used to create a matrix for multivariate analysis. We conclude that cod and haddock eggs can be distinguished using this method.

Vertebral column deformity in adult wild haddock (Melanogrammus aeglefinus )

2018 ◽  
Vol 41 (12) ◽  
pp. 1909-1915 ◽  
Author(s):  
Laith A. Jawad ◽  
Tom J. Hansen ◽  
Sonnich Meier ◽  
Jon Egil Skjaeraasen ◽  
Per Gunnar Fjelldal
Keyword(s):  
Vertebral Column ◽  
Melanogrammus Aeglefinus ◽  
Haddock Melanogrammus Aeglefinus
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