Evolutionary significance of introgressive hybridization in cyprinid fishes

Article Abstract:

The allozymic and mitochondrial DNA variation within and among cyprinid fishes of the genus Gila were studied to determine the significance of introgression within this genus. The samples analyzed represented morphologically diverse forms within this single genus. The results showed that that introgressive hybridization contributed significantly to the evolution of Gila. The existing diversity of morphological forms could be traced to hybridization effects, thus indicating that this mechanism plays a significant role in the evolution of vertebrates.

Genetic aspects, Vertebrates, Evolution (Biology), Hybridization, Cyprinidae, Cyprinids

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Fish do not avoid survey vessels

Article Abstract:

New data obtained by an autonomous underwater vehicle indicate that vessel avoidance is not a significant cause of bias in fish abundance estimates. It was found that avoidance of the autonomous underwater vehicle Autosub-1 by herring is minimal. It is clear that autonomous underwater vehicle technology is now reliable enough for effective fish-stock monitoring. This technology could enhance fisheries surveys by permitting acoustic detection closer to the target species.

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Collapse and recovery of marine fishes

Article Abstract:

Research is presented concerning the ability of 90 marine fish populations to recover former abundance levels following overexploitation which leads to the collapse of numbers of individuals.

Letter to the Editor, Fishery conservation, Marine fishes

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