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Otter fishing

Otter fishing is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Otter fishing rather than just read about it. In short: Otter fishing is a fishing technique which uses trained otters to fish in rivers. This method has been practised since the 6th century in various parts of the world, and is still practiced in southern Bangladesh.

Otter fishing — main illustration
Otter fishing — illustration

Key takeaways

  • Otter fishing belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Otter fishing to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Otter fishing from memory before moving on to harder problems.

Reference excerpt

Otter fishing is a fishing technique which uses trained otters to fish in rivers. This method has been practised since the 6th century in various parts of the world, and is still practiced in southern Bangladesh.

History

Otter fishing has been practiced historically in a number of regions including Central Europe, Northern Africa, the British Isles, Scandinavia, South Asia, Southeast Asia, China and South America. The earliest records of otter fishing are from the Yangtze region of China during the Tang dynasty (618–907) and was observed in the 13th century by Marco Polo on the Yangtze River. Otter fishing in China was practiced for subsistence and also collectively for profit. The Chinese reputedly learned the techniques from the fishermen of Southeast Asia. In India, otter fishing was practiced in the Indus and Ganges river basins, in Bengal and in South India along the Coromandel Coast. Otter fishing was known in Europe from as early as the 16th century. The Scandinavians trained otters for catching trout. Olaus Magnus, the Archbishop of Uppsala, published a tome in 1555, De Gentibus Septentrionalibus (On Northern Peoples), which includes a sketch of a fishing otter. One of the motifs of Magnus's 1539 map of Scandinavia, Carta marina, is an otter fetching a fish for its master, who is ready with a knife and a cooking vessel on the fire. Fishing with otters was known in England, Scotland, Germany and Poland. The first mention of otter fishing in the British Isles dates to 1480, while the method for training otters is described in the 1653 book on angling by Izaak Walton, The Compleat Angler. Individual sportsmen in the Americas and Europe have also used otters for sport fishing. British sportsmen who had served in South India during the early years of the British Raj had been known to import this practice to their homes in Europe. Otter fishing is also reported from Central and South America. A Maxacali creation story from Brazil suggests that the practice of otter fishing may have been prevalent in the past. Fishermen from Guyana used a different tactic – they would observe where an otter deposited its catch and later purloin the fish.

Method In the Old World, two otter species have been primarily used in otter fishing – the Eurasian otter (Lutra lutra), chiefly in Europe and North Africa, and the smooth-coated otter (Lutrogale perspicillata), mostly in South Asia and China. And in the New World, the giant otter (Pteronura brasiliensis) has been used, usually in South America. Olaus Magnus wrote that the otter often fetches the catch for its master but "once in awhile forgets and eats the fish". Izaak Walton's 1653 book describes otter pups, three to four months old, being domesticated and trained. The otters were muzzled to prevent them eating fish and secured by lines to their master. The otters then chased fish in a pond into a net. Another technique was to submerge nets and get the otters to shepherd the fish into them, after which the nets, along with otters and catch, were retrieved. In ancient China, the otter wore a leather harness on its body to which an iron chain was attached. The other end of the chain was either secured to the fisherman's boat or to a bamboo pole. The fisherman would cast his circular net, weighted at the edges, and pull it in. As the net was being pulled in, the otter would be introduced into the net through a small opening. The otter's role was to search for and disturb fish hiding in nooks and crannies and force them into the net so that they were trapped. The otter was subsequently rewarded in the case of a good catch. The practice of using otters to drive fish into nets was prevalent in Asia and is still practiced in southern Bangladesh.

Bangladesh

Otter fishing is still practiced in Narail and Khulna districts, near the Sunderbans in southern Bangladesh. Here fishing with otters is a traditional practice in families, passed down through the generations by fishermen who breed the otters and train them to chase the fish into their nets. In the past, both Lutra lutra and Lutrogale perspicillata were used for otter fishing, but today, only L. perspicillata is used. Otter fishing is usually done at night between 9 PM and 5 AM. The average catch by a single boat in a night ranges from 4 to 12 kilograms (8.8 to 26.5 lb) of crabs, fish and shrimp. Feeroz et al. (2011) recorded a population of 176 domesticated otters amongst 46 groups of fishermen in these districts, of which 138 were working animals. Lack of fish, changes sought in livelihoods by the young and more economical methods of fishing have reduced the number of otter fishermen drastically.

See also

Cormorant fishing

References

Further reading Gudger, E. W. (1927-05-01). "Fishing with the Otter". The American Naturalist. 61 (674): 193–225. Bibcode:1927ANat...61..193G. doi:10.1086/280146. JSTOR 2456673.

External links Video: Journeyman Pictures & ABC Australia. Traditional Otter Fishing in Bangladesh (1997) Video: BBC (9 April 2012). Threat to otter fishing in Bangladesh Video: Time.com (27 Mar 2014). Otters Have Helped Bangladesh Fishermen Catch Fish For Centuries Slideshow: CBS News (11 March 2014). Otters aid Bangladesh fishermen

Illustrations

Otter fishing: Cropped extract of Carta Marina by Olaus Magnus dated 1539 showing an otter retrieving a fish for its master
Cropped extract of Carta Marina by Olaus Magnus dated 1539 showing an otter retrieving a fish for its master
Otter fishing: Otter fishermen in the Sundarbans National Park, Bangladesh
Otter fishermen in the Sundarbans National Park, Bangladesh
Otter fishing illustration

Worked examples

Example 1 — a first encounter with Otter fishing

Start with the simplest possible case. Write down what Otter fishing claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Otter fishing before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Otter fishing ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Otter fishing

In research
Otter fishing appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Otter fishing in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Otter fishing is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fishing in Bangladesh, Fishing techniques and methods, Otters, so understanding it makes those chapters shorter.
In everyday life
Look for Otter fishing outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Otter fishing in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Otter fishing means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Otter fishing out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Otter fishing in simple terms?

Otter fishing is a fishing technique which uses trained otters to fish in rivers. This method has been practised since the 6th century in various parts of the world, and is still practiced in southern Bangladesh.

Why does Otter fishing matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Otter fishing?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Otter fishing.

Tags

  • Fishing in Bangladesh
  • Fishing techniques and methods
  • Otters
  • Working animals

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