Understanding of the processes affecting recruitment of commercially important fish species is one of the major challenges in fisheries science. Towards this aim, we investigated the relation between North Sea hydrography (temperature and salinity) and fish stock variables (recruitment, spawning stock biomass and pre-recruitment survival index) for 9 commercially important fishes using spatiall...

common in nature, having been documented in amphibians, insects, fish, birds, and especially within closely related plant species (Berger 1973; arnold 1992; Fritz et al. 1994; haddad et al. 1994; Parris et al. 1999; arnold et al. 1999; albert et al. 2006; Schierenbeck and Ellstrand 2009; Meyerson et al. 2010). allendorf et al. (2001) noted that hybridization is more common in fish than in other...

Stable isotope ratios of carbon and nitrogen were measured in an unexploited population of walleye pollock (Theragra chalcogramma) from Prince William Sound, Alaska (PWS) as a metric of feeding niche. Stable isotope data of pollock were compared with each other and with stable isotope data of age-0 herring (Clupea pallasii). There were significant species, location, and time period differences ...

Abstract Multispecies bio-economic models are useful tools to give insights into ecosystem thinking and ecosystem-based management. This paper developed an age-structured multispecies model that includes the food web relations of grey seal, salmon, herring, along with salmon herring fisheries in Baltic Sea. The results show increasing seal population influences stock, but impacts on harvest str...

Examining temporal changes in the growth and generation time of fish species can be valuable for understanding population responses to different management measures environmental conditions. Atlantic herring (Clupea harengus) is an ecologically commercially important pelagic forage that occupies southern Gulf St. Lawrence. Here, we developed von Bertalanffy curves estimated yearly values NAFO D...

The spatial structuring of intraspecific genetic diversity is the result of random genetic drift, natural selection, migration, mutation, and their interaction with historical processes. The contribution of each has been typically difficult to estimate, but recent advances in statistical genetics have provided valuable new investigative tools to tackle such complexity. Using a combination of su...

Tests of crude oil toxicity to fish are often chronic, exposing embryos from fertilization to hatch to oil solutions prepared using standard mixing procedures. However, during oil spills, fish are not often exposed for long periods and the dynamic nature of the ocean is not easily replicated in the lab. Our objective was to determine if brief exposures of Atlantic herring (Clupea harengus) embr...

The aim of the present work was to determine the concentration levels, as well as accumulation and magnification coefficients, of triazine derivatives in herring gulls and Baltic grey seals 11 years after a ban on their use in the EU and eight after their exclusion in Poland. Dead birds were collected in the coastal zone of the Gulf of Gdansk in the years 2010-2012. The grey seals, on the other...

A model is developed and demonstrated for simulating echosounder and sonar observations of fish schools with specified shapes and composed of individuals having specified target strengths and behaviors. The model emulates the performances of actual multi-frequency echosounders and multi-beam echosounders and sonars and generates synthetic echograms of fish schools that can be compared with real...

The main aim of this study was to investigate the number and biomass of impinged fish at Forsmark Nuclear Power Plant in Sweden, located on the coast of the Baltic Sea. Of particular interest was the number of impinged individuals of the critically endangered European eel (Anguilla anguilla) which is regularly caught in the cooling system. Another aim was to determine the comparability of the r...