scholarly journals Predation on early life stages is decisive for year-class strength in the Barents Sea capelin (Mallotus villosus) stock

2015 ◽  
Vol 73 (2) ◽  
pp. 182-195 ◽  
Author(s):  
Harald Gjøsæter ◽  
Elvar H. Hallfredsson ◽  
Nina Mikkelsen ◽  
Bjarte Bogstad ◽  
Torstein Pedersen
Keyword(s):  
Early Life ◽  
Barents Sea ◽  
Life Stages ◽  
Early Life Stages ◽  
Mallotus Villosus ◽  
The Barents Sea ◽  
Class Strength ◽  
Capelin Mallotus Villosus

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

1996 ◽  
Vol 42 (1-4) ◽  
pp. 119-123 ◽  
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

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

2016 ◽  
Vol 73 (12) ◽  
pp. 1742-1749 ◽  
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.

scholarly journals Early life growth is affecting timing of spawning in the semelparous Barents Sea capelin (Mallotus villosus)

2021 ◽  
pp. 102614
Author(s):  
Florian Berg ◽  
Samina Shirajee ◽  
Arild Folkvord ◽  
Jane Aanestad Godiksen ◽  
Georg Skaret ◽  
...  
Keyword(s):  
Early Life ◽  
Barents Sea ◽  
Mallotus Villosus ◽  
Capelin Mallotus Villosus ◽  
Timing Of Spawning

Fecundity of the Barents Sea capelin ( Mallotus villosus )

1997 ◽  
Vol 130 (2) ◽  
pp. 309-313 ◽  
Author(s):  
G. Huse ◽  
H. Gjøsæter
Keyword(s):  
Barents Sea ◽  
Mallotus Villosus ◽  
The Barents Sea ◽  
Capelin Mallotus Villosus

Effects of predation from juvenile herring (Clupea harengus) on mortality rates of capelin (Mallotus villosus) larvae

2009 ◽  
Vol 66 (10) ◽  
pp. 1693-1706 ◽  
Author(s):  
Elvar H. Hallfredsson ◽  
Torstein Pedersen
Keyword(s):  
Barents Sea ◽  
Fish Larvae ◽  
Mortality Rates ◽  
Clupea Harengus ◽  
Mallotus Villosus ◽  
Rate Estimate ◽  
Predator Prey ◽  
The Barents Sea ◽  
Capelin Mallotus Villosus ◽  
Larvae Density

Predation has been suggested as a cause of substantial mortality of fish larvae to the degree that it might influence recruitment. This field-based study concludes that juvenile herring ( Clupea harengus ) as small pelagic predator can significantly affect mortality rates of the planktonic larvae of capelin ( Mallotus villosus ) in the Barents Sea. Surveys were carried out in the summers of 2001 and 2003. In 2001, juvenile herring were widely distributed and overlapped with capelin larvae over a wide area, whereas in 2003, the herring were more aggregated. The study focused on predation in the areas of predator–prey overlap. Capelin larvae were observed in the herring stomachs at 11 of 24 stations and at 8 of 16 stations where herring were caught in 2001 and 2003, respectively. At those stations, an estimated 7.3% and 9.9% of the capelin larvae were eaten by herring per day in 2001 and 2003, respectively. Statistical models revealed that density of capelin larvae and copepods and occurrence of euphausiids in the stomachs affected the number of capelin larvae per predator stomach. A simplified model with only capelin larvae density as predictor was converted to a functional response relationship using an experimentally derived digestion rate estimate for capelin larvae in herring stomachs.

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