Comparison of growth in Atlantic cod (Gadus morhua) originating from the northern and southern coast of Iceland reared under common conditions

Kristjánsson, Theódór

doi:10.1016/j.fishres.2012.10.005

Cited by 5 publications

(4 citation statements)

References 33 publications

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“…Although in this study we have not analyzed temperatures at depths below 7 m, it is expected that the installation of an offshore fish farm of Atlantic cod, Gadus morhua, can only be implemented in the northern region of the country and using submersible cages, which can lead to problems related to feeding and cage maintenance. In October 2018, no area presented the optimal temperatures of 7.0-15.4 • C, pointed out for this species by several authors [50][51][52][53]. Although the April 2019 field survey showed optimal temperature values in all areas, the mean monthly temperature data demonstrates that throughout the year, it would not be possible to farm cod.…”

Section: Atlantic Cod Gadus Morhuamentioning

confidence: 82%

Potential for Coastal and Offshore Aquaculture in Portugal: Insights from Physico-Chemical and Oceanographic Conditions

et al. 2022

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Physico-chemical and biological parameters along the Portuguese coast were analyzed to evaluate the potential to produce aquatic species of economic interest. Water samples were collected in 2018 and 2019 in five different areas of the Portuguese coast. Currents data were collected between 2018 and 2020 and historical waves height data from 1988 to 2019. According to the results, there is a wide variety of species that can be considered for production. The northernmost area presented the lowest temperature, as well as the highest levels of chlorophyll a, and nitrate. Under such conditions, the rearing of salmon Salmo salar, mussel Mytilus edulis, scallop Pecten maximus, macroalgae Porphyra umbilicalis, and Undaria pinnatifida can be considered. Regarding the southernmost area, due to the highest temperature, this area seems appropriate for the production of meager Argyrosomus regius, sea bream Sparus aurata, sea bass Dicentrarchus labrax, and greater amberjack Seriola dumerili. This study highlights the challenges in deploying aquaculture structures on the Atlantic coast due to its oceanographic conditions. Site selection for aquaculture is a complex process and pilot studies are essential to analyze the feasibility of developing offshore aquaculture along the coast of Portugal.

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Section: Atlantic Cod Gadus Morhuamentioning

confidence: 82%

Potential for Coastal and Offshore Aquaculture in Portugal: Insights from Physico-Chemical and Oceanographic Conditions

et al. 2022

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“…Consequently, disentangling genetic and environmental effects on juvenile cod size and growth can be difficult across very different life-time temperature regimes. For example, cod originating from offshore and inshore spawning grounds around Iceland did not differ in growth rate when measured at standardized aquaculture conditions [ 53 ]. In the current study, 0-group juvenile cod caught by beach seining were much smaller than juveniles caught in trawls, although size is more associated with geographical and temporal variation ( Table 2 , Fig 2 ).…”

Section: Discussionmentioning

confidence: 99%

Genetic assignment predicts depth of benthic settlement for 0-group Atlantic cod

Ólafsdóttir,

Turnbull,

Jónsdóttir

et al. 2023

PLoS ONE

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Atlantic cod is a keystone species that remains among the most economically important demersal fish in the North Atlantic. Throughout its distribution range, Atlantic cod is composed of populations with varying environmental preferences and migratory propensities. This life-history variation is likely to have contributed to the niche width and large population sizes of Atlantic cod, and its relative resilience to environmental change and exploitation. The Icelandic cod stock is currently managed as a single unit, but early research indicates population variation by depth and temperature and distinct offshore and inshore spawning components. Pelagic 0-group juveniles from different spawning grounds coexist in nursery areas around Iceland, but their genetic composition or habitat partitioning had not been examined post benthic settlement. In the current study we examine the genetic composition of Atlantic cod juvenile aggregations at nearshore nursery grounds in NW-Iceland and report distinct segregation by the depth of offshore and inshore juvenile cod. The physiological mechanism of this segregation is not known, but the pattern demonstrates the need to consider population structure at nursery grounds in the application of marine spatial planning and other area-based conservation tools.

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“…At the start, initial weight was same at both rearing locations and therefore it is reasonable to assume that better growth in Ísafjarðardjúp is due to higher rearing temperature. Moreover, it should be noted that the growth model has proven accurate for growth of cod in the Faroe Islands, Northern Norway and Iceland (Kolbeinshavn, Vestergaard, Patursson & Gislason ; Kristjánsson ).…”

Section: Discussionmentioning

confidence: 99%

“…Test rearing of cod in sea cages has shown that the growth rates need to be improved. It takes ~26–32 months for 150 g juveniles to grow to 3 kg (Björnsson, Steinarsson & Árnason ; Kristjánsson ). By using thermal growth coefficient of 3.4 as for salmon, this is half the expected growth rate for salmon under the same conditions (Johnston, Bickerdike, Xuejun, Dingwall, Nickell, Alderson & Campbell ).…”

Section: Introductionmentioning

confidence: 99%

Heritability of economically important traits in the Atlantic codGadus morhuaL

Kristjánsson

Árnason

2014

Aquac Res

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During the development of breeding programme for Atlantic cod Gadus morhua L., in Iceland, genetic parameters were estimated for 1402 individuals, which were assigned with DNA profiling to 140 dams and 70 sires. The cod was reared in cages on the eastern and western coasts of Iceland from 2004 to 2005. At the average body weight of 1.8 kg, the estimated heritability (h 2 AE SE) for body weight, gutted weight and the condition factor (CF) were 0.31 AE 0.06, 0.34 AE 0.04 and 0.24 AE 0.06 respectively. Genetic correlation (r G ) in body weight between the two rearing locations was estimated as 0.95, which reflects a low G 9 E interaction. The estimated heritability for hepatosomatic index (HSI) and fillet yields was 0.061 AE 0.04 and 0.04 AE 0.04 respectively. The HSI and fillet yields were highly genetically correlated with body weight or 0.67 and 0.82 respectively. The genetic correlation between the CF and body weight was estimated as 0.31. There appears to be substantial amount of additive genetic variation for body weight suggesting that selection is likely to be successful. Low heritability for fillet yields and the HSI indicates less promise of genetic improvement. Assigning of parentage to individuals with DNA profiling was 80% successful.

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Comparison of growth in Atlantic cod (Gadus morhua) originating from the northern and southern coast of Iceland reared under common conditions

Cited by 5 publications

References 33 publications

Potential for Coastal and Offshore Aquaculture in Portugal: Insights from Physico-Chemical and Oceanographic Conditions

Potential for Coastal and Offshore Aquaculture in Portugal: Insights from Physico-Chemical and Oceanographic Conditions

Genetic assignment predicts depth of benthic settlement for 0-group Atlantic cod

Heritability of economically important traits in the Atlantic codGadus morhuaL

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