science

List of cartilaginous fish of Sri Lanka

List of cartilaginous fish of Sri Lanka 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 List of cartilaginous fish of Sri Lanka rather than just read about it. In short: Sri Lanka is a tropical island situated close to the southern tip of India. The diversity of fish fauna within the inland waterways and around the island is very high considering the small size of the island.

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Reference excerpt

Sri Lanka is a tropical island situated close to the southern tip of India. The diversity of fish fauna within the inland waterways and around the island is very high considering the small size of the island.

Class Chondrichthyes - Cartilage fishes Among the marine fishes, sharks and batoids (rays and skates) form a considerable diversity. A preliminary checklist of sharks around Sri Lanka was compiled by marine biologist, ornithologist, astronomer and well known diver Rex I. De Silva in 1985. It is cited as the first most comprehensive catalogue to Sri Lankan cartilage fishes. On 2016 May, he published the Illustrated Guide of Sharks of Sri Lanka. According to De Silva, there are 60 sharks species and 30 rays and skates found around the coast of Sri Lanka. Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. The following list of shark species recorded from the territorial waters of Sri Lanka.

Order Hexanchiformes - primitive sharks

Family Hexanchidae - cow sharks

Order Squaliformes

Family Centrophoridae - gulper sharks

Family Dalatiidae - kitefin sharks

Family Echinorhinidae - bramble sharks

Family Somniosidae - sleeper sharks

Order Orectolobiformes - carpet sharks

Family Hemiscylliidae - bamboo sharks

Family Stegostomatidae

Family Ginglymostomatidae - nurse sharks

Family Rhincodontidae

Order Lamniformes - mackerel sharks

Family Alopiidae - thresher sharks

Family Odontaspididae - sand sharks

Family Pseudocarchariidae

Family Lamnidae - white sharks

Family Megachasmidae - megamouth

Order Carcharhiniformes - ground sharks

Family Scyliorhinidae - catsharks

Family Proscylliidae - finback catsharks

Family Triakidae - houndsharks

Family Hemigaleidae - weasel sharks

Family Carcharhinidae - requiem sharks

Family Sphyrnidae - hammerhead sharks

Batoidea is a superorder of cartilaginous fish commonly known as batoids or rays, but it also includes the skates and sawfishes. Approximately 560 species are described in thirteen families. Batoids are in the fish subclass Elasmobranchii along with sharks, as they are closely related. Rays are distinguished by their flattened bodies, enlarged pectoral fins that are fused to the head, and gill slits that are placed on their ventral surfaces. The following list of rays and skates species recorded from the territorial waters of Sri Lanka.

Order Pristiformes

Family Pristidae - carpenter sharks

Order Torpediniformes - electric rays

Family Narkidae - sleeper rays

Order Myliobatiformes - sting rays

Family Myliobatidae - eagle rays

Family Dasyatidae - whiptail stingrays

Family Gymnuridae - butterfly rays

Subfamily Mobulidae - devil rays

References

Rex I. De Silva (1984–1985). "The Sharks of Sri Lanka – A Key to the Different Species and a Preliminary Checklist". Ceylon Journal of Science. Biological Sciences. 17–18: 56–66. Retrieved 2014-07-28. "Lanka among world's top 20 shark killers | The Sundaytimes Sri Lanka". sundaytimes.lk. Retrieved 2014-07-28. http://www.divesrilanka.com/Fauna-Sharks.html De Silva, R. I. 2015. The Sharks of Sri Lanka. Colombo. Field Ornithology Group of Sri Lanka. https://sites.google.com/site/booksharksofsrilanka/home/ Ebert, D.A., De Silva, R.I. and Goonewardene, M. First Record of a Dwarf False Catshark (Carcharhiniformes" Pseudotriakidae) from Sri Lanka. LORIS 27 (5 and 6) pp. 63–64.

Illustrations

Worked examples

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

Start with the simplest possible case. Write down what List of cartilaginous fish of Sri Lanka 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 List of cartilaginous fish of 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 cartilaginous fish of 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 cartilaginous fish of Sri Lanka

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