Fecundity and growth of Atlantic cod (Gadus morhua L.) along a latitudinal gradient

Abstract

Havforskningsinstituttets institusjonelle arkiv Brage IMR - Institutional repository of the Institute of Marine Research b r a g e i m rDette er forfatters siste versjon av den fagfellevurderte artikkelen, vanligvis omtalt som postprint. I Brage IMR er denne artikkelen ikke publisert med forlagets layout fordi forlaget ikke tillater dette. Du finner lenke til forlagets versjon i Brage-posten. Det anbefales at referanser til artikkelen hentes fra forlagets side. Ved lenking til artikkelen skal det lenkes til post i Brage IMR, ikke direkte til pdf-fil.This is the author's last version of the article after peer review and is not the publisher's version, usually referred to as postprint. You will find a link to the publisher's version in Brage IMR. It is recommended that you obtain the references from the publisher's site.Linking to the article should be to the Brage-record, not was undertaken over several years, however, not always sequentially, in order to 37 assess whether the relationships between fecundity and other key features were 38 constant or variable. Also, we compared historical maturity ogives and growth from 39 the different regions. There was a clear pattern with fish maturing at a greater age and 40 size in the north compared to the south. For three of the four cod stocks we 41 demonstrated a significant reduction in relative potential fecundity as maturity 42 progressed towards spawning, i.e., as the mean diameter of vitellogenic follicles 43 increased. To be able to compare potential fecundity in a standardised way both in 44 time and space, we constructed models that included mean diameter as one of the 45 independent variables. Our potential fecundity comparisons clearly indicated a north-46 south gradient with increasing size-specific fecundity towards the south. The higher 47 fecundity of the fish in the south could only partly be explained by the higher 48 condition and temperature that was observed in these waters. 49 50

Spatial and annual variation in fecundity and oocyte atresia of yellowtail flounder, Limanda ferruginea, in U.S. waters

“…However, results within the current study and collectively with earlier work and the multiple Grand Bank studies provide support for decreasing fecundity with increasing latitude as has been demonstrated in other species and regions (e.g. Thorsen et al, 2010).…”

Fecundity regulation in relation to habitat utilisation of two sympatric flounder (Platichtys flesus) populations in the brackish water Baltic Sea

“…Size specific fecundity varies amongst populations due to adaptations to local environmental conditions, both abiotic (e.g. salinity and temperature; Nissling and Dahlman, 2010;Thorsen et al, 2010) and biotic (food availability and population density; Nash et al, 2000;Kennedy et al, 2007), and temporally with fish size/age and condition, i.e. with the stock structure within a population (e.g.…”

Reproductive strategy of forkbeard, Phycis phycis, from the Portuguese coast

“…Atlantic cod [72]; black scabbardfish Aphanopus carbo Lowe, 1839 [14,50]; and European seabass Dicentrarchus labrax (Linnaeus, 1758) [43]), and it is assumed that species with determinate fecundity are strongly associated with capital breeding behaviour [44]. In determinate species, the reproductive investment is heavily dependent on the feeding season prior to the major yolk production that takes place during vitellogenesis [5]; however, batch spawning can reduce the energy initially required for spawning [44].…”