Martin S. Kumar Thai Thanh Binh Samantha N. Burgess Le Thanh Luu
There are questions remaining about many aspects relating to fish food, including, the type of organisms consumed, mechanisms of consumption, and the digestibility and nutritive value of plankton. Common practice has been to divide fish into different types according to foraging in natural habitats, that is, fish are described as feeding on phytoplankton, zooplankton, benthic animals, macrophytes, or detritus. The distinction between the different feeding habits is not always absolute. Although species such as rohu, Labeo rohita, mrigal, Cirrhinus mrigala (Indian major carp), and Nile tilapia, Oreochromis niloticus (African origin) are omnivorous, their adaptability in different climatic conditions varies.
Martin S. Kumar Thai Thanh Binh Le Thanh Luu Steven M. Clarke
Efficient usage of fertilizers in organic or inorganic forms show onflicting results in terms of net fish production under various climatic conditions. Manures applied to polyculture ponds as organic fertilizer, require a process of decomposition before the nutritional contents are released, assimilated, and utilized by plankton. On the other hand, inorganic (chemical) fertilizers are granular and concentrated with primary nutrients. Major nutrients such as nitrogen (N) and phosphorus (P) readily dissolve in water in ionic forms of nitrate, ammonium and orthophosphate. The differences in fertilizer solubility (nutrient release rate) and decomposition processes (organic fertilization) make the water quality and biological response distinctively different in inorganic fertilizer applied ponds. Previous research has indicated that one grass carp, Ctenopharyngodon idella, can support the growth of three silver carp.
INCO-DC FISHSTRAT Project, funded by the European Commission, is an ongoing multidisciplinary research program undertaken over the period 1998–2001. Three reservoirs in SriLanka (Victoria, Minneriya and Udawalawe) of different morphology, age and geographic location, Ubolratana reservoir, in Thailand, and Lake Taal, in the Philippines, are the object of this study......
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