The Effects of Temperature on Feeding and Expression of Two Appetite-related Factors, Neuropeptide Y and Cocaine- and Amphetamine-regulated Transcript, in Atlantic Cod,Gadus morhua

2008 ◽  
Vol 39 (6) ◽  
pp. 790-796 ◽  
Author(s):  
A. S. Kehoe ◽  
H. Volkoff
Keyword(s):  
Neuropeptide Y ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Related Factors ◽  
Effects Of Temperature

Effects of temperature on life history set the sensitivity to fishing in Atlantic cod Gadus morhua

2014 ◽  
Vol 514 ◽  
pp. 217-229 ◽  
Author(s):  
HY Wang ◽  
LW Botsford ◽  
JW White ◽  
MJ Fogarty ◽  
F Juanes ◽  
...  
Keyword(s):  
Life History ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Effects Of Temperature

scholarly journals Estimating and mitigating the discard mortality of Atlantic cod (Gadus morhua) in the Gulf of Maine recreational rod-and-reel fishery

2016 ◽  
Vol 73 (9) ◽  
pp. 2342-2355 ◽  
Author(s):  
Connor W. Capizzano ◽  
John W. Mandelman ◽  
William S. Hoffman ◽  
Micah J. Dean ◽  
Douglas R. Zemeckis ◽  
...  
Keyword(s):  
Best Practice ◽  
Gadus Morhua ◽  
Fishery Management ◽  
Gulf Of Maine ◽  
Atlantic Cod ◽  
Related Factors ◽  
Discard Mortality ◽  
Recreational Fishery ◽  
Receiver Array ◽  
Management Plans

Abstract In recent years, the recreational contribution to the total catch of Atlantic cod (Gadus morhua) in the Gulf of Maine (GOM) has increased with recreational discards outnumbering recreational landings by 2:1. However, the discard mortality (DM) rate of cod released in the recreational fishery remains poorly understood, thus contributing to the uncertainty in stock assessments and fishery management plans. The current study examined the capture-related factors most detrimental to cod DM in the GOM recreational rod-and-reel fishery. Atlantic cod (n = 640; 26.0–72.0 cm) were angled from June–October 2013 on southern Jeffreys Ledge in the western GOM using fishing gear representative of the local recreational fishery. A subset (n = 136) was also tagged with pressure-sensing acoustic transmitters before being released into an acoustic receiver array (n = 31) deployed to monitor survival up to 94 days. To properly model DM up to the fishery-wide level, all cod were visually assessed for capture-related injuries according to a four-level injury score index. Mean tackle-specific DM rates of 15.4 and 21.2% were estimated for bait- and jig-captured cod, respectively, with an overall 16.5% mean DM rate for the 2013 GOM recreational cod fishery. Twenty-nine cod tagged with acoustic transmitters were identified as dead, where the majority (∼90%) died within 16 h post-capture. Upon evaluation with a specifically adapted parametric survival analysis, greater incidence of mortality was attributed to the capture and handling process (rather than release) for moderately and severely injured cod. Based on the capture-related factors associated with the highest injury rates, we recommend minimizing fight and handling times, avoiding areas with small cod, educating inexperienced anglers, and favouring bait over jigs to mitigate mortality. Results will continue to inform the development of fishery management plans and enhance survival through dissemination of “best practice” techniques to fishery stakeholders.

Growth model for Atlantic cod (Gadus morhua): Effects of temperature and body weight on growth rate

Aquaculture ◽  
2007 ◽  
Vol 271 (1-4) ◽  
pp. 216-226 ◽  
Author(s):  
Björn Björnsson ◽  
Agnar Steinarsson ◽  
Tómas Árnason
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Growth Model ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Effects Of Temperature

Neuropeptide Y effects on vasorelaxation and intestinal contraction in the Atlantic cod Gadus morhua

2002 ◽  
Vol 282 (5) ◽  
pp. R1414-R1421 ◽  
Author(s):  
Fatemeh Shahbazi ◽  
Susanne Holmgren ◽  
Dan Larhammar ◽  
Jörgen Jensen
Keyword(s):  
Nitric Oxide ◽  
Smooth Muscle ◽  
Neuropeptide Y ◽  
Indirect Effect ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Direct Action ◽  
Physiological Role ◽  
Cardiovascular Effects ◽  
Nerve Fibers

Neuropeptide Y (NPY) has prominent cardiovascular effects in mammals and sharks, but no such effect has previously been demonstrated in any teleost fish. In the Atlantic cod, we found that cod NPY (10−10–10−6 M) relaxed celiac arteries precontracted with epinephrine, and weak contractions were elicited in intestinal ring preparations. A few NPY-immunoreactive nerve fibers were present along small gut arteries. The results suggest that cod NPY produces vasorelaxation both by a direct action on smooth muscle and by release of prostaglandins, but with no involvement of nitric oxide, leukotrienes, or endothelium-derived relaxing factors. An additional indirect effect involving another neurotransmitter may occur. Cod NPY (10−7 M) and human NPY (10−7 M) had identical effects on the vessels. Small differences only in the effects of porcine [Leu31,Pro34]NPY, NPY-(13–36), and cod NPY suggest the presence of a Y1 subfamily receptor, similar to the zebrafish Ya receptor. A physiological role for NPY in teleost vasculature is concluded, but surprisingly the effect, a vasodilation, is opposite to that in mammals and is mediated by prostaglandins.

Effects of temperature on specific dynamic action in Atlantic cod Gadus morhua

2014 ◽  
Vol 41 (1) ◽  
pp. 41-50 ◽  
Author(s):  
Bjørn Tirsgaard ◽  
Jon Christian Svendsen ◽  
John Fleng Steffensen
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Specific Dynamic Action ◽  
Dynamic Action ◽  
Effects Of Temperature

Role of Stock Biomass and Temperature in Recruitment of Southern Gulf of St. Lawrence Atlantic Cod, Gadus morhua

1975 ◽  
Vol 32 (9) ◽  
pp. 1613-1627 ◽  
Author(s):  
P. F. Lett ◽  
A. C. Kohler ◽  
D. N. Fitzgerald
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Early Life History ◽  
Maximum Sustainable Yield ◽  
Order Effects ◽  
Total Biomass ◽  
Stock Biomass ◽  
Parent Stock ◽  
Effects Of Temperature ◽  
Egg Abundance

A multivariate approach was used to elucidate the simultaneous effects of temperature and estimated parent stock biomass on the recruitment mechanism of Gulf of St. Lawrence cod. The second order effects of temperature and estimated stock biomass were key factors in determining egg abundance levels. In addition, egg abundance was closely related to the growth rate of cod. The numbers of larvae increased with the interaction of temperature with egg abundance but decreased with the interaction of egg abundance and time. The most important step in the recruitment mechanism occurs during the juvenile stage, the degree of density dependence being reliant on total biomass of the adult cod stock. A system simulation was constructed amalgamating the equations of early life history of cod with the effects of exploitation on stock biomass. Regular 12-yr oscillations were demonstrated at low levels of catch, while the population became more stable at higher fishing efforts in the absence of environmental effects. The optimal fishing mortality for the Gulf of St. Lawrence cod was found to be F0.4, with a maximum sustainable yield of 42,000 metric tons.

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