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Figure 10 Effect of temperature on growth or production of food animals. (From Beall and Samuels, 1971). Aquaculture , which is the controlled breeding of aquatic forms of life, is gaining world- wide importance nowadays, due to an increasing market demand. Control of the breeding temperatures for aquatic species is of much greater importance than for land species, as can be seen in Figure 10, which shows that the growth curve trend of aquatic species is very different from that of land species. By maintaining an optimum temperature artificially we can breed more exotic species, improve production and even, in some cases, double the reproductive cycle (Barbier and Fanelli, 1977). The species that are typically raised are carp, catfish, bass, tilapia, mullet, eels, salmon, sturgeon, shrimp, lobster, crayfish, crabs, oysters, clams, scallops, mussels and abalone. Aquaculture also includes alligator and crocodile breeding, which could prove an innovative and lucrative industry. Experiments in the United States have shown that, by maintaining its growth temperature at about 30 °C, an alligator can be grown to a length of about 2 m in 3 years, whereas alligators bred under natural conditions will reach a length of only 1.2 m over the same period. Another form of aquaculture is the cultivation of protein-rich microalgae, such as Spirulina. 23PDF Image | What is geothermal energy
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