Showing papers in "Fisheries Research in 2000"

TL;DR: In this article, a maximum likelihood-based stock mixture analysis was applied to feeding (summer) and over-wintering stock distributions, using the fingerprints of the spring spawning aggregations as known-stock reference samples.

TL;DR: A positive relationship between otolith Sr and habitat salinities among freshwater, estuarine, and marine taxa is observed and is consistent with expectations on frequency of spawning migration.

TL;DR: Environmental conditions, transmitted through the physiology of fish, affect the otolith growth rate (increment width) but increment periodicity may be disrupted only in extreme cases of physiological stress.

TL;DR: The basic structure of the auditory system is reviewed and the hearing capabilities of teleost fishes are described, which may have consequences for extrapolation of data between species with regard to hearing.

TL;DR: In this paper, an age-and batch-specific model of egg production, egg size and egg buoyancy showed a substantial increase in the probability of egg survival with female age, indicating that stock age structure should be seriously considered in stock-recruitment relationships and in the management of the cod stock in the Baltic.

TL;DR: The methods used to develop catch rate based indices of relative abundance for the school shark Galeorhinus galeus resource off southern Australia are outlined in this paper, which are based on fitting generalized linear models to catch and effort data for several regions in this fishery.

TL;DR: Data storage tags have been used to study vertical movements of individually tagged cod and calculations indicated that the fish probably were negatively buoyant most of the time, but the direct effect of the vertical movements on the acoustical target strength could not be quantified.

TL;DR: In this paper, stable oxygen (δ 18 O) and carbon isotope ( δ 13 C) records were obtained from the otoliths of cod (sp. Gadus morhua ), using micro-sampling methods that allow for high temporal resolution within the Otoliths' seasonal growth bands (up to 20 plus samples per year).

TL;DR: The applications of remote sensing methods for fisheries research are reviewed in this paper, namely the use of airborne, and active and passive satellite technology, in support of fisheries activities by several countries, mainly USA and Japan.

TL;DR: In this paper, a year-round trawling ban was implemented in 1990 in the Gulf of Castellammare (NW Sicily, Mediterranean Sea) over an area of about 200 km 2, with the purpose of fish stock rebuilding.

TL;DR: Experimental crosses with coho, sockeye, and chinook salmon showed that otolith core strontium concentrations reflected maternal associations with fresh and sea water as mentioned in this paper, indicating that fish raised to maturity in freshwater are an effective natural marker for captive brood stock programs.

TL;DR: While the von Bertalanffy growth functions were not significantly different for the two methods, the underestimates of age from whole otoliths caused serious over-estimation of natural mortality and serious overfishing could occur if these estimates were applied for fishery management purposes.

TL;DR: The average mean age of European elvers was 350 days at metamorphosis from leptocephalus to glass eel and 448 days at estuarine arrival as discussed by the authors.

TL;DR: It is concluded that the use of a single method to obtain ground truth data is generally likely to be inadequate and recommended multiple methods for ground truth, so that inadequacy of individual techniques is to some extent compensated by supplementary methods.

TL;DR: The otolith growth pattern confirmed that there was a high correlation between larval size at sampling and previous larval Size both within and between groups and to a large extent also individual larvae originating from different prey regimes.

TL;DR: It is suggested that gill-net capture negatively impacts the upstream migration behaviour of Atlantic salmon and that the negative effects of capture and radio tagging can well exceed those proposed in current literature.

TL;DR: In this paper, the authors examined changes in the major New Zealand orange roughy fishery on the Chatham Rise during a 19-year period, and found that the distribution of the population showed a marked contraction and aggregations became largely centred around seamounts or very localised areas of the slope.

TL;DR: The longer life span and lower rate of natural mortality for L. carponotatus indicates that this species will be more vulnerable to overfishing than L. vitta, and the periodicity of annulus formation was validated by oxytetracycline labelling of tagged fishes in a separate study.

TL;DR: In this article, acoustic surveys and mark-recapture experiments were used to examine seasonal movements and distribution of coastal cod in Placentia Bay, Newfoundland (NAFO stock sub-division 3Ps).

TL;DR: Almost 50% of the stray migrants were recovered within 30 km of the release site, indicating that the highest risk of straying may occur during the transition from bi-coordinate navigation to imprinted natal stream clues.

TL;DR: There was a significant positive relation between mean prey width and predator size and Ontogenetic differences were found in the diet composition and feeding activity within the range of sizes studied.

TL;DR: Evidence is provided that increased temperature during a squid’s early growth period may accelerate growth markedly giving rise to significant differences in size-at-age for adult squid hatched at different temperatures.

TL;DR: In this article, dual-beam hydroacoustics were employed on quarterly research trips to measure the density and in situ target strengths of fishes associated with petroleum platforms in 20, 60 and 219m of water.

TL;DR: In this article, the authors investigated the composition of the bycatch from research prawn trawling in an area closed to fishing in the northern Great Barrier Reef and found that fish made up 69% of bycatch, sponges 11% and crustaceans 10%.

TL;DR: The catch composition of two commercial vessels of the trawl fleet operating from Mallorca (Balearic Islands, western Mediterranean) was analyzed in this article, showing that fishes represented the major proportion with respect to the total catch.

TL;DR: In this article, the authors compared swimming and orientation capabilities of walleye pollock under light and dark conditions in commercial type trawl gear using infrared illumination and video cameras to monitor these behaviors.

TL;DR: The condition of cod off Greenland during autumn in the period 1982-1998 was among the lowest observed in natural populations of this species.

TL;DR: It is suggested that otolith weight could represent a valuable criteria for an age determination technique that is objective, economic and easy to perform compared to traditional methods that have been defined “as much an art as a science”.

TL;DR: The FISH-LIFT is commended as a suitable tool for investigations requiring trawl caught live fish, as for the study of external parasites, for loosely scaled fish, for deep water fishes, for tagging experiments and for the collection of fish for other experiments and aquariums.

TL;DR: In this article, the authors analyzed landings and survey data for the Kuwait shrimp fishery and found that the estimated bycatch-to-shrimp ratios exhibited a seasonal pattern, with summer having the highest ratio.