Investment in maturity-at-age and -length in northeast Atlantic cod stocks

Nash, Richard D.M.; Pilling, Graham M.; Kell, Laurence T.; Schön, Pieter-Jan; Kjesbu, Olav Sigurd

doi:10.1016/j.fishres.2010.03.001

Cited by 23 publications

(14 citation statements)

References 44 publications

(56 reference statements)

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“…thermal range for cod (Sundby, 2000). These differences in temperature is probably a 428 major driving force for the differences that we see in growth rate, age at first maturity 429 and maybe also fecundity (Kjesbu et al, 2010) (Table 4). Also this type of fecundity 465 estimate was considerable higher than for the other cod stocks.…”

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confidence: 88%

“…Both individual ovary weight and 531 fecundity are usually available in the fecundity data sets since it is the basis for the 532 calculation of potential fecundity. However, for determinate batch spawners, such as 533 cod, the leading cohort diameter (mean of the largest 10% of advanced oocytes in the 534 ovary) may be a better proxy for maturation because of its close link and sensitivity to 535 the start of spawning (Kjesbu, 1994;Kjesbu et al, 2010). In pilot tests we have found 536 that leading cohort can be used instead of mean oocyte diameter in our present 537 models.…”

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confidence: 98%

“…In our investigation it 491 was the prespawning condition that was used. If the condition at start of vitellogenesis 492 had been used instead, or in addition, the explanatory power of condition might have 493 been higher, although it has been recently shown that temperature influences the 494 timing of this peak production of oocytes (Kjesbu et al, 2010). for maturity, as one of the independent variables in the fecundity regressions to 518 account for the loss of fecundity prior to spawning.…”

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confidence: 99%

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

et al. 2010

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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

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

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“…Declines in L 50 and A 50 have been observed in many heavily exploited fisheries, such as cod Gadus morhua (Cardinale and Modin, 1999;Chen and Mello, 1999;Olsen et al, 2005;Nash et al, 2010) and herring Clupea harengus (Engelhard and Heino, 2004a).…”

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confidence: 99%

Long-term variations in body length and age at maturity of the small yellow croaker (Larimichthys polyactis Bleeker, 1877) in the Bohai Sea and the Yellow Sea, China

Shan

Jin

et al. 2011

Fisheries Research

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“…Monitoring the life history parameters and the spawning biomass is crucial for effective long-term management and conservation of a given resource (Jørgensen et al, 2007;Trippel, 1995). Increased mortality can select towards maturation at an earlier age (Chuwen, Potter, Hall, Hoeksema & Laurenson, 2011;Nash, Pilling, Kell, Schön & Kjesbu, 2010) and smaller size (Cardoso & Haimovici, 2014;, since a delayed maturation results on a decreased probability of surviving long enough to reproduce (Morgan & Colbourne, 1999). Length and age at first maturity can be used as indicators of stock size, that is, a decrease in these parameters may indicate an important stock response to reduction in population size.…”

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Stock assessment of the blue jack mackerel, Trachurus picturatus, in the North‐eastern Atlantic

Vasconcelos

Sousa

Riera

et al. 2018

Fisheries Management Eco

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A total of 49,151 blue jack mackerel, Trachurus picturatus, (Bowdich) was collected in Madeira Island (North‐eastern Atlantic) between 2002 and 2016 to evaluate possible influence of fishing on landings and reproductive parameters. A decreasing trend in the length composition was observed over the study period and length at first maturity decreased by 2.78 cm TL. Maximum yield per recruit decreased from 2002 to 2016 but the corresponding fishing mortality was constant (Fmax = 0.4/year). Considering the fishing mortality level in 2016, it is evident that the stock may be exploited beyond its sustainability limit. Amendments of the purse‐seine fishing regulations and implementation of measures to reduce fishing effort are suggested.

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Investment in maturity-at-age and -length in northeast Atlantic cod stocks

Cited by 23 publications

References 44 publications

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

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

Long-term variations in body length and age at maturity of the small yellow croaker (Larimichthys polyactis Bleeker, 1877) in the Bohai Sea and the Yellow Sea, China

Stock assessment of the blue jack mackerel, Trachurus picturatus, in the North‐eastern Atlantic

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