Environmental Engineering

Lake Victoria: Ecology, Resources, Environment by Joseph L. Awange

By Joseph L. Awange

This publication constitutes a pioneering and specific paintings on Lake Victoria. it's the world’s moment biggest fresh-water lake and helps the livelihood of greater than 30 million humans. strangely, there was no entire publication addressing its difficulties and potentials. Ecology, environmental pollutants and source administration are a number of the matters addressed by means of this entire perception into the restrictions, demanding situations and possibilities dealing with Lake Victoria.

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Additional resources for Lake Victoria: Ecology, Resources, Environment

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Fig. 3, p. 31). , Fig. 10 in page 406 ). Observations indicate that > 35% of all Nile Perch landed is immature, consisting of fish less than 20 cm. 0 kg for some export markets. This is the reason for the decline of the Nile Perch fishery in the Lake Victoria. 3 Fisheries 39 The current fishing effort is very high and needs to be regulated. The number of fishermen in Kenyan sector is excessive and has increased from 11,000 in 1971 to over 56,000 currently. Due to declining catches, fishermen have been forced to adopt smaller meshed nets of > 5”.

10. Annual fish yields from Lake Victoria in tonnes in Kenya for the period 1975-2000 Year L. nilot Rarg O. nilot Other P. aeth tilapia 1469 440 202 4548 51 1975 935 586 421 5652 97 1976 773 970 465 6704 1977 203 612 1634 972 1978 1066 8710 472 1777 962 1979 4286 9321 370 1980 4310 9443 1184 3829 187 1981 22834 7635 1858 2039 1982 33134 10419 2581 1894 239 1983 52337 16444 2516 1766 108 1984 41319 19437 6136 1342 81 1985 50029 25866 7573 1869 150 1986 64929 31084 7853 1311 150 1987 86832 30803 9024 1329 58 1988 82019 50484 3434 625 25 1989 119276 82764 5777 4707 24 1990 118503 82764 4494 565 84 1991 122780 84663 5212 19456 81 1992 105979 98232 7035 1993 109195 80501 12768 1994 60830 98745 10301 1995 81721 76564 9111 2149 172 1996 96471 49670 10765 5123 148 1997 73004 40315 13953 17838 1540 1998 76663 42336 14652 18826 1617 1999 114808 40168 23701 20202 405 2000 109069 39967 23226 20142 404 Haplo B.

The non-cichlid fishes have also changed, and there are at least 50 species, of which 29 are endemic, and one endemic genus. The non-cichlids show much less divergence from the riverine stock. This is unlike the case with non-cichlid fish in Lake Tanganyika, which have had a much longer time to diversify. While most of the species remain in the Lake all year around, there are a number (at least 13 species) of anadromous (ascending) fish, especially cyprinids, characids and siluroids, which swim up the rivers when they are in flood, breed in a suitable place, and return with their young fish to the Lake as the water level drops.

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