Fuel and metabolic scaling during the early life stages of Atlantic cod Gadus morhua

Productivity is a central determinant of population dynamics with consequences for population viability, resilience to exploitation, and extinction. In fish, the strength of a cohort is typically established during early life stages. Traditional approaches to measuring productivity do not allow for interannual variation in the maximum reproductive rate, a parameter governing population productivity. Allowing such process variation provides the ability to track dynamic changes instead of assuming a static productivity regime. Here we develop and evaluate a multivariate stock–recruitment state-space model to simultaneously estimate time-varying stock productivity and synchronicity of dynamics across populations. We apply the method to North Atlantic cod (Gadus morhua) populations, showing that the productivity of early life stages has varied markedly over time, with many populations at historically low productivity. Trends in productivity were similar in some adjacent populations but less regionally coherent than previously thought, particularly in the Northwest Atlantic. Latitudinal variation in the Northeast Atlantic suggests a differential response to environmental change. We conclude that time-varying productivity provides a useful framework that integrates across many dimensions of environmental change affecting early life history dynamics.

Download Full-text

The effect of triploidization of Atlantic cod (Gadus morhua L.) on survival, growth and deformities during early life stages

Aquaculture ◽

10.1016/j.aquaculture.2013.01.015 ◽

2013 ◽

Vol 388-391 ◽

pp. 54-59 ◽

Cited By ~ 14

Author(s):

Ingegjerd Opstad ◽

Per Gunnar Fjelldal ◽

Ørjan Karlsen ◽

Anders Thorsen ◽

Tom J. Hansen ◽

...

Keyword(s):

Early Life ◽

Gadus Morhua ◽

Atlantic Cod ◽

Life Stages ◽

Early Life Stages

Download Full-text

Toxicity and developmental effects of Arctic fuel oil types on early life stages of Atlantic cod (Gadus morhua)

Aquatic Toxicology ◽

10.1016/j.aquatox.2021.105881 ◽

2021 ◽

Vol 237 ◽

pp. 105881

Author(s):

Bjørn Henrik Hansen ◽

Trond Nordtug ◽

Julia Farkas ◽

Essa A. Khan ◽

Erika Oteri ◽

...

Keyword(s):

Early Life ◽

Gadus Morhua ◽

Atlantic Cod ◽

Fuel Oil ◽

Life Stages ◽

Early Life Stages ◽

Developmental Effects

Download Full-text

Comparison of DNA damage in the early life stages of cod, Gadus morhua, originating from the Barents Sea and Baltic Sea

Marine Environmental Research ◽

10.1016/0141-1136(96)00079-7 ◽

1996 ◽

Vol 42 (1-4) ◽

pp. 119-123 ◽

Cited By ~ 6

Author(s):

Gunilla Ericson ◽

Gun Åkerman ◽

Birgitta Liewenborg ◽

Lennart Balk

Keyword(s):

Dna Damage ◽

Baltic Sea ◽

Early Life ◽

Gadus Morhua ◽

Barents Sea ◽

Life Stages ◽

Early Life Stages ◽

The Barents Sea

Download Full-text

Reproductive strategy of a migratory fish stock: implications of spatial variations in natural mortality

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2015-0321 ◽

2016 ◽

Vol 73 (12) ◽

pp. 1742-1749 ◽

Cited By ~ 8

Author(s):

Øystein Langangen ◽

Geir Ottersen ◽

Lorenzo Ciannelli ◽

Frode B. Vikebø ◽

Leif Christian Stige

Keyword(s):

Reproductive Strategy ◽

Early Life ◽

Gadus Morhua ◽

Barents Sea ◽

Spatial Variations ◽

Fish Stock ◽

Life Stages ◽

Early Life Stages ◽

The Barents Sea ◽

Survival And Growth

We investigate how the reproductive strategy in a migratory marine fish may be influenced by spatial variations in mortality in early life stages. In particular, we examine how spawning time and location affect offspring survival and growth. A drift model for early life stages (eggs to age 1) of the Barents Sea cod (Gadus morhua) is combined with empirical estimates of spatial variation in mortality at two different life stages. We examine seasonal and interannual differences in survival and growth in offspring originating from two spawning grounds, with the central site requiring higher migration distance, and hence cost, than the northern site. When accounting for spatially explicit mortality fields, central and northern spawned offspring have about equal survival, as do early and late spawned offspring. Furthermore, central spawned offspring grow faster and are likely to reach a larger size compared with northern spawned offspring. Our results indicate that the fitness benefit of southward migration in the Barents Sea cod is not mainly due to higher early survival of offspring, but rather due to effects of offspring acquiring a larger size.

Download Full-text