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Accumulation of anoxic sediments below cages due to fecal and waste feed build-up; market competition, especially for export produce; conflicts/failures, social disruption; consumption of wood and other materials.
Sitka black-tail fawns are born in late spring, following the breeding season in late November.
The number of rays in the anal fin is typically 30–35**, and coloration is usually slate blue on the back, shading to white on the belly.
Life History The spawning behavior of blue catfish is similar to that of channel catfish.
Blue catfish, channel catfish and flathead catfish are the three primary species of catfish in the United States and most sought after species.
Most rivers lakes and reservoirs and the United States have populations of one of these species of catfish available in good numbers.
It began in China, possibly due to the desires of an emperor to have a constant supply of fish.
It is speculated that the techniques for keeping fish in ponds originated in China with fishermen who kept their surplus catch alive temporarily in baskets submerged in rivers or small bodies of water created by damming one side of a river bed.
Brackishwater aquaculture is thought to have originated in Indonesia with the culture of milkfish and grey mullet (Ling, 1977) and must have spread to neighbouring countries like the Philippines which has been practising it for about 300 to 400 years (Baluyut, 1989).
The husbandry of fish is therefore not a new phenomenon.
Another possibility is that aquaculture developed from ancient practices for trapping fish, with the operations steadily improving from trapping-holding to trapping-holding-growing, and finally into complete husbandry practices (Ling, 1977). Possible environmental Impacts of aquaculture Public health risks and consumer resistance (microbial diseases, red tides, industrial pollution; rough weather losses; seed shortages; market competition especially for export produce; failures, social disruption.
Freshwater: health risks to farm workers from waterborne diseases.
) refers to any system that combines conventional aquaculture (raising aquatic animals such as snails, fish, crayfish or prawns in tanks) with hydroponics (cultivating plants in water) in a symbiotic environment.