Fish can infer social rank by observation alone

Article Abstract:

Studies have shown that male fish (Astatotilapia burtoni) can successfully make transitive inferences (TIs) on a hierarchy implied by pairwise fights between rival males. The results have indicated that a universal mechanism underlying TI is unlikely, as animals use multiple domain-specific representations adapted to different social and ecological pressures that they encounter during the course of their natural lives.

United States, Public affairs, Social aspects, Behavior

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Rapid worldwide depletion of predatory fish communities

Article Abstract:

Analysis of community biomass and composition of predatory fishes in four continental shelf and nine oceanic systems indicate that industrialized fisheries reduce community biomass by 80% within 15 years, while meta-analytic approach the current large predatory fish biomass is 10% of the pre-industrial levels.

Canada, Analysis, Environmental aspects, Animal populations, Biotic communities, Biomass, Population biology, Fish population declines

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Why mothers matter

Article Abstract:

Larger female fish are more productive than smaller ones and produce better offspring than younger ones. This discovery can aid fisheries to maintain their quality and population.

United Kingdom, Fish eggs

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