Friday, May 15, 2009
Members of RYDEC engaged in a rigorous tree planting exercise at the RUIRU GIRLS SECONDARY SCHOOL where more than 600 trees of indigenous species were planted.
The event was graced by the area chief and a myriad of other dignatories. The District, municipal and Forest Authorities were well represented at the special occasion. Special thanks goes to them for their part in the realization of this objective.
Members of the group prepared the planting surface well in advance and proceeded to groom and water the seedlings to maturity
Monday, February 9, 2009
Monday, February 2, 2009
Site selection and placement of cages
Large bodies of water tend to be better suited for cage culture than small ponds because the water quality is generally more stable and affected less by fish waste. Exceptions are eutrophic waters rich in nutrients and organic matter. Small (1 to 5 acre) ponds can be used for cage culture, but provisions for water exchange or emergency aeration may be required. Cages should be placed where water currents are greatest, usually to the windward side. Calm, stagnant areas should be avoided. However, areas with rough water and strong currents also present problems.
Cages may be moored individually or linked in groups to piers, rafts, or lines of heavy rope suspended across the water surface. At least 15 feet should separate each cage to optimize water quality. The cage floor should be a minimum of 3 feet above the bottom substrate, where waste accumulates and oxygen levels may be depressed. However, greater depths promote rapid growth and reduce the possibility of parasitism and disease. See SRAC publications Nos. 160-166 for more information on cage culture.This is what rydec group has started in Twiga Dam in Ruiru Kenya.