Fish toxins

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For fish that produce venom harmful to humans, see Venomous fish.

Fish toxins or fish stupefying plants have historically been used by many hunter gatherer cultures to stun fish, so they become easy to collect by hand. Some of these toxins paralyse fish, others work by reducing oxygen content in water.[1] The process of documenting many fish toxins and their use is ongoing, with interest in potential uses from medicine, agriculture, and industry.[2]

Theory[edit]

Use of the herbal fish poisons has been documented in a number of sources involving catching fish from fresh and sea water.[3]

Tribal people historically used various plants for medicinal and food exploitation purposes.[4] Use of fish poisons is a very old practice in the history of humankind. In 1212 AD, King Frederick II prohibited the use of certain plant piscicides, and by the 15th century, similar laws had been decreed in other European countries, as well.[5] All over the globe, indigenous people use various fish poisons to kill fish, including America[6] and among Tarahumara Indians.[7][citation needed]

Herbal fish-stupefying agents are proven means of fishing, which do not kill fish like chemical poisons. Many of these plants have been used for a long time by local people, and have been tested and found to have medicinal properties, such as Careya arborea, which is used as analgesic[8] and antidiarrheal.[9] Some of the plants, such as C. collinus, are traditional poisons used in the different part of the country.[10][11] Bark extracts of Lannea coromandelica caused lysis of cell membranes followed by fragmentation of cellular materials.

Example plants[edit]

Odcha at fruiting
  • Olax in the family Olacaceae is a climber with compound, dark-green leaves and white bark. This is the most extensively used fish poison among the Gondi. Typically in summer, the leaves of this plant are dried and powdered. About 1 kg of powder is mixed into water about 5 ft (1.5 m) deep in ponds, usually in the summer. Fish are stunned by the poison and rise to the surface, where they are easily collected by hand. If stunned fish were immediately reintroduced into clean water, they would become active. To get good results from the Olax (or korkat), the temperature should be high.
  • Careya arborea in the family Lecythidaceae is a large deciduous tree with simple large obovate leaves, large fruit and dark gray bark. The root bark is crushed and mixed in water. Upon its admixture, water blackens.
  • Cleistanthus collinus in the family Euphorbiaceae (odcha in Gondi) is a medium-sized tree mainly found around villages. Young tender shoots of this species are used for fish stunning. The shoots are crushed in water on stone, and a paste is mixed into the water. Apart from its use as fish-stupefying agent, the stem of this plant is used for brushing teeth, leaves for storing grains, and wood as fuel.
  • Lannea coromandelica in the family Anacardiaceae is a medium-sized to large deciduous tree with a spreading crown and stout branches. The leaves are compound, the bark is whitish or gray, and it has small, yellowish or purplish flowers. Flowers and fruits appear between February and June. Fruits (red, compressed, reniform, and single-seeded) of this plant are crushed and mixed in water. It is abundant in the Mendha forest.
  • Costus speciosus in the family Costaceae is an erect, succulent herb, up to 2.7 m tall and with a tuberous rootstock, which is crushed and mixed in water for fish stunning. Apart from its use as fish stunning agent in Mendha, tubers of bese mati are consumed after boiling.
  • Madhuca indica in the family Sapotaceae is a large tree, with seeds yielding edible oil. After the removal of the oil from seeds, the remaining cake is used for fish stunning. This cake is locally known as gara-dhep. The cake is boiled in water and mixed into water. A 0.5-kg cake is sufficient for a 100 ft2 pond. It is an effective agent, but fish usually die from its application.
  • Pterocarpus marsupium in the family Fabaceae is a large tree with simple leaves. Its gray bark is used for fish poisoning, crushed and mixed in water.

See also[edit]

References[edit]

  1. ^ Ethnozoology of the Tsou People: Fishing with poison.
  2. ^ Jeremy, 2002
  3. ^ A.L. Dahl (1985} Traditional Environmental Management in New Caledonia: A Review of Existing Knowledge
  4. ^ V. Singh (ed) (2007) Indian Folk Medicines and Other Plant-Based Products. Jodhpur Scientific Publications. Chapter 22 ISBN 81-7233-481-8
  5. ^ Wilhelm 1974
  6. ^ Jeremy 2002
  7. ^ Gajdusek 1954
  8. ^ Ahmed et al. 2002
  9. ^ Rahman et al. 2003
  10. ^ Sarathchandra and Balakrishnamurthy 1997
  11. ^ Thomas et al. 1991
  12. ^ "Plants used for poison fishing in tropical Africa"
  13. ^ C. Michael Hogan (2008) California Buckeye: Aesculus californica, GlobalTwitcher.com, N. Stromberg ed.
  14. ^ Campbell, Paul (1999). Survival skills of native California. Gibbs Smith. p. 433. ISBN 978-0-87905-921-7. 
  15. ^ Rashtra Vardhana (2006). Floristic plants of the world. Sarup & Sons. ISBN 978-81-7625-651-3.