Pelagic fish North Atlantic

Sales of pelagic fish in

Species interactions that play out over large spatial scales are difficult to observe, particularly in the oceans. The current lack of empirical evidence for biologically meaningful interaction parameters likely delays the application of holistic management procedures. Here we estimate interactions during the early life history of fish across regions. We present separate and hierarchical Bayesian models that estimate the direction and strength of interactions between Atlantic cod and dominant pelagic fishes across much of their range in the North Atlantic. We test the hypothesis that small pelagic fish may reduce survival of cod at early life stages, and thereby contribute to the delayed recovery of depleted cod populations.

Significant regional variation exists between cod recruitment and Atlantic herring abundance with eight of 14 regions displaying a negative relationship, four regions displaying no relationship, and a positive relationship observed in two regions. In contrast, most regions where Atlantic mackerel co-occurs showed no relationship with cod recruitment, with the possible exception of Gulf of St. Lawrence and Celtic Sea regions. Regions with sprat or capelin as dominant pelagics also displayed weak or no relationship, although the probability of a negative interaction with sprat increased when time series autocorrelation was accounted for. Overall, the interaction between herring and young cod was found to be negative with 94% probability, while the probability of negative interactions with mackerel was only 68%. Our findings suggest that the strength of predation or competition effects on young cod varies among small pelagic species but appears consistently for Atlantic herring; this effect may need to be considered in recovery trajectories for depleted cod populations. The methods introduced here are applicable in the investigation of species interactions from time series data collected across different study systems.

Key words:  competition, cultivation–depensation, ecosystem-based management, hierarchical Bayesian, marine fish, measurement error, parameter standardization, population dynamics, predation, trophic triangle

1 Present address: Marine and Freshwater Research Centre, Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland. E-mail: Coilin.Minto@gmit.ie

Corresponding Editor: M. H. Carr.

Cited by

, , , . (2013) Productivity dynamics of Atlantic cod. Canadian Journal of Fisheries and Aquatic Sciences1-14
Online publication date: 10-Oct-2013.
, , , , . (2013) Giants' shoulders 15 years later: lessons, challenges and guidelines in fisheries meta-analysis. Fish and Fisheriesn/a-n/a
Online publication date: 1-Oct-2013.
. (2013) Quantifying the balance between bycatch and predator or competitor release for nontarget species. Ecological Applications 23:5, 972-983
Online publication date: 1-Jul-2013.
Abstract . Full Text . PDF (431 KB) , , , . (2013) Spatial analysis of North Sea cod recruitment: concurrent effects of changes in spawning stock biomass, temperature and herring abundance. Marine Ecology Progress Series 480, 263-275
Online publication date: 22-Apr-2013.
, , , , . (2013) Prey preferences of sympatric fin (
Seasonal migrations of blue whiting in the Norwegian Sea in 1978 to 1982 (C.M)
Book (International Council for the Exploration of the Sea, Pelagic Fish Committee)

Actually your notions about frozen fish may be

2008-07-14 15:57:30 by part_of_the_problem

While *truly* fresh fish is superior to frozen for texture in many cases, what passes as "fresh" is often not really that fresh.
If you ever had the kinds of pelagic fish you describe within 30-60 minutes of being caught, you would be amazed at how un-fishy they are, especially tuna.
When fish is fileted and flash frozen at sea in that same time frame, it will most likely have less of a fishy flavor than the same fish that stays unfrozen for even a few hours trip to market, which is enough time to develop a fishy enough taste to put off someone who is sensitive to it.


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