For example, Olorwituyi et al.(1992) reported 96-h LC50 of 99ppm and 9Oppm for "round up' and Gramoxone exposed to
catfish, Ciarías gartepinus (mean weight 30g) while Cruz et al. (1988) reported 2.58pprn and 0.092ppin for the molluscides, aquation and brestan respectively on O. mossambicus (mean weight 30g).