Start Depredating birds

Depredating birds

Bird depredation results in loss of crop and income.

Additional observations at night should be made to verify bird depredation. Cormorants often injure fish, allowing access to fungal and bacterial disease organisms.

Herons sometimes spear but do not kill or eat larger brood stock.

In recent years, populations of normally migratory waterbirds have been reported to remain near fish production facilities year-round.

The proximity of nearby nesting or roosting sites and the availability of alternative feeding sites are also important factors.

Birds can have a significant economic impact on the culture of aquatic products including fish, shellfish, crustaceans, and other invertebrates. Swimming feeding - swims or floats on surface of water.

For our purpose here, we will refer to these birds as fish-eating birds, and the aquatic products as fish. Identification and description of the feeding habits and behavior of birds commonly responsible for damage at aquaculture facilities. Fish-eating birds are highly mobile and adaptable predators, able to rapidly exploit situations of food abundance.

All fish-eating birds that frequent aquaculture facilities are classified legally as migratory and thus are protected by federal, and in most cases, state laws.

These laws were developed to protect US interest in migratory birds in concert with the interests of other nations that provide habitat to these same avian populations.

As an example, Table 3 illustrates the variety of feeding behaviors used by six species of herons.

The open-water areas and large concentrations of aquatic livestock at aquaculture facilities are natural attractants to many birds.

Paul Gorenzel Staff Research Associate Department of Wildlife, Fisheries and Conservation Biology University of California Davis, California 95616 Fred S.