By Pedro Morais, Francoise Daverat
Since the book of The Migrations of Fish by Prof. Alexander Meek in 1916, a few books were released in this topic. notwithstanding, every one of these books merely disguise one kind of migratory mechanisms. This publication goals to beat this crisis through featuring a finished assurance of all lifestyles historical past strategies―potadromy, anadromy, catadromy, amphidromy and oceanodromy in a single book.
The first part of this booklet studies the heritage of fish migration reports, the most definitions and ideas comparable with fish migration and the most tendencies and demanding situations of fish migration study. the second one part describes the most approaches and styles linked to all migratory lifestyles historical past suggestions, in addition to the most difficulties linked to their conservation. ultimately, the 3rd part offers examples of the most methodologies used to check fish migration.
This ebook used to be conceived with the target to supply undergraduate and graduate scholars and researchers with a entire booklet on which they can rely.
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Extra resources for An introduction to fish migration
Migration and movements are very widespread strategies in potamodromous fishes (Northcote 1978) and ultimately result in fish switching habitats. Salmonids, for example, change habitats many times during their growth and development, and each change within and across life stages involves migration (Thorpe 1988). Early studies of fish migration relied on external marks to track individuals between habitats in an effort to characterize timing and duration. As Lucas and Baras (2001) observed, the relative inadequacy of early techniques used to investigate the migration of freshwater fishes contributed to the idea that many freshwater fishes exhibit very little movement, which is now viewed as a misplaced paradigm (Gowan et al.
Three other terms, ‘non-anadromous’, ‘resident’, and ‘inland’ are more commonly substituted in the fisheries literature. Unfortunately, these three terms have multiple definitions, as well as regional connotations which may confound their application to a broad geographic area (Gresswell et al. 1997). Consequently, potamodromous provides a more precise and more broadly applicable definition of fishes that remain wholly within freshwater. Although potamodromous fishes are widespread among freshwater fish assemblages, the significance of potamodromy has received far less attention than diadromy (Northcote 1998).
There are advantages to maintaining high levels of reproductive homing: eggs are deposited in suitable habitat and homing tends to balance the number of spawners with the reproductive capacity of the area (Northcote 1997). Despite the benefits of homing, some straying may also have a long term selective advantage; enabling species to invade new areas and repopulate old ones in the wake of stochastic events (Lindsey et al. 1959). Following the 1980 eruption of Mount St. Helens in Washington (USA), native cutthroat trout and sculpin, that found refugia in ice covered lakes or less-impacted tributaries, were able to recolonize streams where fish populations had been extirpated (Bisson et al.
An introduction to fish migration by Pedro Morais, Francoise Daverat