Sentence examples for migration of fish from inspiring English sources
The dams will hinder or block the migration of fish, and because most of the important species migrate long distances to spawn, fish harvests could decline by nearly half; proposed dams on tributaries would cut harvests further.
Some seasonal migration of fish occurs, notably through the Bosporus.
A massive migration of fish has already taken place on the other side of the North Pole.
Upstream migration of fish through circular culverts is often prevented by velocities in the barrel being higher than that of the natural channel.
This study deals with hydraulic characteristics for different weir types and effects on upstream migration of fish in a pool-weir fishway, and presents an optimal design of weir for an easy upstream migration.
The Mekong River Commission has said it had "fundamental gaps in knowledge" about how the dam would affect the migration of fish, an important source of food for the millions of people who live along the river's banks.
Environmental factors are of primary importance in the migration of fishes and marine invertebrates.
The migration of fishing fleets is as much a product of overfishing down south as of climate change.In 2010 the Arctic Council published an index of trends in Arctic vertebrate populations, using data for 306 species (35% of the total) gathered between 1970 and 2004.
These latter are the concern of the Biological Branch, since unrestricted fishing results in an irregular supply, and the depletion of certain fishing regions causes a migration of fishing effort to regions more remote from markets, thus intensifying competition, elevating costs, damaging quality, and, in addition, creating international disturbances and animosities.
Horizontal migrations of fish that span distances of hundreds of metres to tens of kilometres are common and generally related to patterns of feeding or reproduction.
We use the example of ontogenetic migrations of fish from mangroves to coral reefs because it nicely demonstrates how spatial ecological processes generate predictable heterogeneity in habitat value that should be considered in the reserve design process.
