Intra- and interannual variation in fecundity and egg size of lumpfish (Cyclopterus lumpus) in Iceland

Kennedy, James; Ólafsson, Halldór G.

doi:10.7755/fb.118.3.4

Cited by 2 publications

(1 citation statement)

References 15 publications

(33 reference statements)

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“…Therefore, the duration of vitellogenesis would be in the range 8-10 months. This is a rather prolonged period for vitellogenesis compared to e.g., Atlantic wol sh or Atlantic cod where duration of vitellogenesis is about 4-6 months, but similar to lump sh where vitellogenesis is at least 8 months (Gunnarsson, 2017;Kennedy and Ólafsson, 2020;Tveiten and Johnsen, 1999;Yaragina, 2010).…”

Section: Discussionmentioning

confidence: 90%

Investigating temporal variability and influence of condition on fecundity of spotted wolfish (Anarhichas minor) in Icelandic waters

Gunnarsson,

Kennedy,

Elvarsson

et al. 2023

Preprint

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To investigate inter- and intra- annual differences in fecundity, the influence of condition on fecundity and time scale of ovary development, 150 female Atlantic wolffish (Anarhichas minor) were sampled in Icelandic waters from 2006–2021. Backwards extrapolation of oocyte size indicates that vitellogenesis begins in December and is likely completed after 8–10 months. There was no evidence of either intra- or inter-annual differences in fecundity, indicating that down-regulation is minimal and that fecundity of spotted wolffish is stable between years. A positive relationship between oocytes size and fish length was detected, while body condition and hepatosomatic index had only a small influence on fecundity in comparison with weight. There was a negative relationship between length and relative fecundity and the exponent of the fecundity–length relationship was lower than exponent of the weight–length relationship. Therefore, total egg production is likely not proportional to the spawning stock biomass of spotted wolffish, and unusually, total egg production would decrease with increasing proportion of larger fish in the population.

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Section: Discussionmentioning

confidence: 90%

Investigating temporal variability and influence of condition on fecundity of spotted wolfish (Anarhichas minor) in Icelandic waters

Gunnarsson,

Kennedy,

Elvarsson

et al. 2023

Preprint

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Investigating temporal variability and influence of condition on fecundity and spawning of spotted wolffish (Anarhichas minor) in Icelandic waters

Gunnarsson,

Kennedy,

Elvarsson

et al. 2024

Polar Biol

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Spotted wolffish (Anarhichas minor) is a poorly understood species which is often captured as part of mixed demersal fisheries across its range. Abundance has declined in many regions and there is a need for greater knowledge on its biology. To improve our understanding of reproduction of A. minor, we investigated inter- and intra- annual differences in fecundity, the influence of condition on fecundity and time scale of ovary development. From 2006 to 2021, 150 females A. minor were sampled in Icelandic waters. Of these females, 73 were also used to estimate spawning time together with an additional 334 females from commercial catch and surveys from 2006 to 2023. Backwards extrapolation of oocyte size indicates that vitellogenesis begins in December and is likely completed after 8–10 months. There was no evidence of either intra- or inter-annual differences in fecundity, indicating that downregulation is minimal and that fecundity of A. minor is stable between years. A positive relationship between oocytes size and fish length was detected, while body condition and hepatosomatic index had only a small influence on fecundity in comparison with weight. There was a negative relationship between length and relative fecundity and the exponent of the fecundity–length relationship was lower than exponent of the weight–length relationship. Therefore, total egg production is likely not proportional to the spawning stock biomass of A. minor, and unusually, total egg production would decrease with increasing proportion of larger fish in the population. The spawning season was estimated to be from middle of August to middle of October with peak of spawning in September.

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Intra- and interannual variation in fecundity and egg size of lumpfish (Cyclopterus lumpus) in Iceland

Cited by 2 publications

References 15 publications

Investigating temporal variability and influence of condition on fecundity of spotted wolfish (Anarhichas minor) in Icelandic waters

Investigating temporal variability and influence of condition on fecundity of spotted wolfish (Anarhichas minor) in Icelandic waters

Investigating temporal variability and influence of condition on fecundity and spawning of spotted wolffish (Anarhichas minor) in Icelandic waters

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