Toxicity of the Root of Linostoma pauciflorum on the Mortality Rate of 6 Species Freshwater Fish and Pond Fish Water Quality.

Abstract

The study of toxicity of the root of Linostoma pauciflorum on the mortality rate of
6 species freshwater fish and pond fish water quality was divided into 2 experiments. The 1st
experiment was to study the toxicity of the root of L. pauciflorum on the mortality rates of
Oreochromis niloticus by using glass aquariums tanks filling with 14 liters of water and 10
fishes which their total length ranged between 5 and 7.5 cm. The static bioassay method
was used in this experiment. The result found that the lethal concentration (LC50) of the root
of L. pauciflorum causing the 50% death of O. niloticus at 24 hours was 1.10 mg/l. The water
quality in the glass aquariums including total ammonia, nitrite, nitrate, pH and temperature
was suitable for freshwater fish. The 2nd experiment was to study the toxicity of the root of
L. pauciflorum and tea seed cake on freshwater fish in earthen ponds. The factorial in
randomized block design was use in this experiment. The 1st factor was plant species; no use
of plants, the root of L. pauciflorum and tea seed cake. The 2nd was fish species;
Oreochromis niloticus, Barbonymous gonionotus, Pangasius sutchi, Poecilia reticulate,
Anabas testudineus and Clarias batrachus. This study using the lowest concentration of L.
pauciflorum causing 100 percent fish death in 6 hours. The result showed that the
concentration of root of L. pauciflorum at 6 mg/l in 24 hours. causing 100% mortality rate of
O. niloticus and more than 95% mortality rate of B. gonionotus. In case of the same
concentration of tea seed cake, the result showed that the mortality rate of B. gonionotus
and P. reticulate was 100% and no mortality of C. batrachus and A. testudineus for both
plants at this concentration.