Harm caused by fish

• Many sharks attack has proved fatal and some such as sting ray (Trygon) has poisonous sting and cause painful bite, which might prove to fatal.
• Some electric fishes such as Torpedo are capable of generating electric shock to man.
• Like marine fishes, fresh water fishes are also carrying different types of toxic substances and these cause food poisoning.

Some of the toxin secreted by fish includes:

a) Tetradoxin: Tetradoxin poisons presents in Tetradon species in skin, liver and eggs. These fishes when consumed lead to gastro-intestinal disorder, neurological disorder such as paralysis, convulsion and respiratory failure.

b) Ootoxin: Such type of toxic substance found eggs of Schizothorax and Cyprinus species. Consumption of eggs without proper cooking cause headache, diarrhea, vomiting and fever also.

c) Haemotoxin: Anguilla species have been reported to carry hamotoxin in blood. The use of such fish without proper cooking may cause vomiting and diarrhea.

d) Zootoxin: Certain fishes like mangur (Clarias batrachus), Singhe (Heteropneustes fossilis) etc. carry zootoxin in the body. It bites by pectoral spine is very painful bite cause swelling of biting space along with fever.