biology

List of introduced fish in Sri Lanka

List of introduced fish in Sri Lanka is a biology 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 List of introduced fish in Sri Lanka rather than just read about it. In short: Sri Lanka is a tropical island situated close to the southern tip of India. It is situated in the middle of the Indian Ocean.

Key takeaways

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

Reference excerpt

Sri Lanka is a tropical island situated close to the southern tip of India. It is situated in the middle of the Indian Ocean. This is a partial list of fish species introduced to Sri Lanka.

Class: Actinopterygii - Ray-finned fishes Since Sri Lanka was ruled by the Portuguese, Dutch, and British. At various junctures, these nations introduced a number of exotic species, which included mammals, plants, birds, and fish. After Sri Lanka secured its independence, the introductions continued unabated, and the breeding of exotic aquarium fish for export became popular. The deliberate and accidental introduction of exotic fish into Sri Lanka has led to serious ecological damage, as many of these species disrupt ecosystems, reducing the diversity of endemic fish to a degree that causes extinction. Invasive introduced exotic fish, such as the Sail-fin pleco, also cause economic damage by reducing the amount of local fish caught by fishermen while being of no or little economical value themselves. Most of the invasive exotic fish were originally brought for commercial purposes, mainly as aquarium fish and for food. An introduced, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its native distributional range, which has arrived there by human activity, either deliberate or accidental. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are called invasive species. Some have a negative effect on a local ecosystem. Some introduced species may have no negative effect or only minor impact. Some species have been introduced intentionally to combat pests. There are 24 introduced fish species which inhabit all freshwater, brackish water and marine waters.

Order: Cypriniformes

Family: Cyprinidae - Carps and allies Cyprinids are stomachless fish with toothless jaws. Even so, food can be effectively chewed by the gill rakers of the specialized last gill bow.

Order: Salmoniformes - Salmons

Family: Salmonidae All salmonids spawn in fresh water, but in many cases, the fish spend most of their lives at sea, returning to the rivers only to reproduce. This lifecycle is described as anadromous. They are slender fish, with rounded scales and forked tails.

Order: Cyprinodontiformes - Toothcarps

Family: Poeciliidae - Guppy and swordtails They are extensively used for mosquito control, poeciliids can today be found in all tropical and subtropical areas of the world.

Order: Perciformes

Family: Cichlidae - Cichlids Cichlids are popular freshwater fish kept in the home aquarium. Cichlids tend to be of medium size, ovate in shape, and slightly laterally compressed, and generally similar to the North American sunfishes in morphology, behavior, and ecology.

Family: Osphronemidae - Gouramis Many gouramis have an elongated, feeler-like ray at the front of each of their pelvic fins. Many species show parental care: some are mouthbrooders.

Family: Helostomatidae - Kissing gouramis Single species is known. The kissing gourami is a popular aquarium fish.

Order: Siluriformes - Catfishes

Family: Loricariidae - Suckermouth fishes These fish are noted for the bony plates covering their bodies and their suckermouths. They are popular as aquarium fish.

Order: Osteoglossiformes - Bony tongues

Family: Notopteridae - Knifefishes Known as knifefish or featherbacks, have slender, elongated, bodies, giving them a knife-like appearance. The caudal fin is small and fused with the anal fin, which runs most of the length of the body. Where present, the dorsal fin is small and narrow, giving rise to the common name of "featherback".

References http://biodiversityofsrilanka.blogspot.com/p/freshwater-fish-diversity-of-sri-lanka_29.html https://web.archive.org/web/20150209130058/http://www.fish.lk/ http://www.environmentmin.gov.lk/web/images/pdf/freshwater%20fish.pdf http://www.multifishlanka.com/brackish-water-fish.html http://www.naqda.gov.lk/brackish_water.php https://www.scribd.com/doc/15883696/fisheries-and-fish-sp-in-sri-lanka http://www.sundaytimes.lk/030615/funday/2.html http://www.ceylontoday.lk/18-19330-news-detail-invasive-aliens.html

Illustrations

Worked examples

Example 1 — a first encounter with List of introduced fish in Sri Lanka

Start with the simplest possible case. Write down what List of introduced fish in Sri Lanka claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 List of introduced fish in Sri Lanka 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 List of introduced fish in Sri Lanka 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 List of introduced fish in Sri Lanka

In research: List of introduced fish in Sri Lanka appears in biology 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 List of introduced fish in Sri Lanka 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: List of introduced fish in Sri Lanka is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fish of Sri Lanka, Introduced fish species, Lists of biota of Sri Lanka, so understanding it makes those chapters shorter.
In everyday life: Look for List of introduced fish in Sri Lanka 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 List of introduced fish in Sri Lanka in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what List of introduced fish in Sri Lanka means in your own words.
Compare your version with the excerpt and mark what you missed.
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Frequently asked questions

What is List of introduced fish in Sri Lanka in simple terms?

Sri Lanka is a tropical island situated close to the southern tip of India. It is situated in the middle of the Indian Ocean.

Why does List of introduced fish in Sri Lanka matter?

Because it connects several biology 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 List of introduced fish in Sri Lanka?

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 List of introduced fish in Sri Lanka.