biology

List of critically endangered fishes

List of critically endangered fishes 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 critically endangered fishes rather than just read about it. In short: As of July 2017, the International Union for Conservation of Nature (IUCN) listed 1,000 critically endangered fish species, including 87 which are tagged as possibly extinct. Of all evaluated fish species, 3.0% are listed as critically endangered.

Key takeaways

List of critically endangered fishes 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 critically endangered fishes to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of List of critically endangered fishes from memory before moving on to harder problems.

Reference excerpt

As of July 2017, the International Union for Conservation of Nature (IUCN) listed 1,000 critically endangered fish species, including 87 which are tagged as possibly extinct. Of all evaluated fish species, 3.0% are listed as critically endangered. The IUCN also lists four fish subspecies as critically endangered. Of the subpopulations of fish evaluated by the IUCN, 20 species subpopulations and one subspecies subpopulation have been assessed as critically endangered. Additionally 3191 fish species (21% of those evaluated) are listed as data deficient, meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN. While the category data deficient indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of attention as threatened taxa, at least until their status can be assessed". This is a complete list of critically endangered fish species and subspecies evaluated by the IUCN. Species considered possibly extinct by the IUCN are marked as such. Species and subspecies which have critically endangered subpopulations (or stocks) are indicated.

Cartilaginous fishes Cartilaginous fishes include sharks, rays, skates, and shovelnose rays. The majority of the order Rhinopristiformes, which includes sawfish, guitarfish, wedgefish, and other shovelnose rays, is considered critically endangered, with 28 of its 64 evaluated species considered critically endangered by the IUCN.

Carchariniformes Borneo shark (Carcharhinus borneensis) Pacific smalltail shark (Carcharhinus cerdale) Pondicherry shark (Carcharhinus hemiodon) Oceanic whitetip shark (Carcharhinus longimanus) Lost shark (Carcharhinus obsoletus) (possibly extinct) Smalltail shark (Carcharhinus porosus) Whitefin swellshark (Cephaloscyllium albipinnum) Reticulated swellshark (Cephaloscyllium fasciatum) Sarawak pygmy swellshark (Cephaloscyllium sarawakensis) Indian swellshark (Cephaloscyllium silasi) Tope (Galeorhinus galeus) Ganges shark (Glyphus gangeticus) Whitefin topeshark (Hemitriakis leucoperiptera) Daggernose shark (Isogomphon oxyrhynchus) Striped smoothhound (Mustelus fasciatus) Speckled smoothhound (Mustelus mento) Narrownose smoothhound (Mustelus schmitti) Humpback smoothhound (Mustelus whitneyi) Winghead shark (Eusphyra blochii) Scalloped bonnethead (Sphyrna corona) Scalloped hammerhead (Sphyrna lewini) Scoophead (Sphyrna media) Great hammerhead (Sphyrna mokarran) Smalleye hammerhead (Sphyrna tudes) Spotted houndshark (Triakis maculata)

Lamniformes Sand tiger shark (Carcharius taurus)

Orectolobiformes Shorttail nurse shark (Pseudoginglymostoma brevicaudatum)

Squaliformes Dwarf gulper shark (Centrophorus atromarginatus)

Squatiniformes Sawback angelshark (Squatina aculeata) Argentine angelshark (Squatina argentina) Chilean angelshark (Squatina armata) Japanese angelshark (Squatina japonica) Indonesian angelshark (Squatina legnota) Hidden angelshark (Squatina occulta) Smoothback angelshark (Squatina oculata) Angelshark (Squatina squatina)

Rajiformes Common blue skate (Dipturus batis) Longnose skate (Dipturus confusa) Bignose fanskate (Sympterygia acuta) Flapper skate (Dipturus intermedius) Menni's skate (Dipturus mennii) Korean skate (Hongeo koreana) Maltese skate (Leucoraja melitensis) Spotback skate (Atlantoraja castelnaui)

Myliobatiformes Wingfin stingray (Fontitrygon geijskesi) Smalltooth stingray (Hypanus rudis) Colares stingray (Fontitrygon colarensis) Smooth stingray (Fontitrygon garouaensis) Pakistan whipray (Maculabatis arabica) Shorttail whipray (Maculabatis bineeshi) Thorny whipray (Fontitrygon ukpam) Smalleye round ray (Urotrygon microphtalmum) Reticulate round ray (Urotrygon retiulata) Tentacled butterfly ray (Gymnura tentaculata) Starrynose cowtail ray (Pastinachus stellurostris) Lusitanian cownose ray (Rhinoptera marginata) Common eagle ray (Myliobatis aqulia) Duckbill eagle ray (Aetomylaeus bovinus) Ornate eagle ray (Aetomylaeus vespertilio) Shortnose eagle ray (Myliobatis ridens)

Rhinopristiformes Largetooth sawfish (Pristis pristis) Smalltooth sawfish (Pristis pectinata) Green sawfish (Pristis zijsron) Dwarf sawfish (Pristis clavata) Narrow sawfish (Anoxypristis cuspidata) Giant guitarfish (Glaucostegus typus) Halavi guitarfish (Glaucostegus halavi) Bowmouth guitarfish (Rhina ancylostoma) Smoothback guitarfish (Rhinobatos lionotus) Spineback guitarfish (Rhinobatos irvinei) Sharpnose guitarfish (Glaucostegus granulatus) Bangladeshi guitarfish (Glaucostegus younholeei) Stripenose guitarfish (Acroteriobatus variegatus) Clubnose guitarfish (Glaucostegus thouin) Widenose guitarfish (Glaucostegus obtusus) Annandale's guitarfish (Rhinobatos annandalei) Whitespotted guitarfish (Rhynchobatus djiddensis) Jimbaran guitarfish (Rhinobatos jimbaraensis) Brown guitarfish (Rhinobatos schlegeii) Blackchin guitarfish (Glaucostegus cemiculus) Annandale's guitarfish, Bengal guitarfish (Rhinobatos annandalei) Brazilian guitarfish (Pseudobatus horkelii) Common guitarfish (Rhinobatos rhinobatos) Philippine guitarfish (Rhinobatos whitei) Broadnose wedgefish (Rhynchobatus springeri) Bottlenose wedgefish (Rhynchobatus australiae) Smoothnose wedgefish (Rhynchobatus laevis) African wedgefish (Rhynchobatus luebberti) Taiwanese wedgefish (Rhynchobatus immaculatus) Roughnose wedgefish (Rhynchobatus cooki) Whitespotted wedgefish (Rhinobatos albomaculatus) Brown guitarfish (Rhinobatos schlegelii) Japanese wedgefish (Rhynchobatus mononoke) False shark ray (Rhynchorhina mauritaniensis)

Torpediniformes Red Sea torpedo (Torpedo suessii) (possibly extinct) Argentine torpedo (Tetronarce puelcha) Subpopulations

Ray-finned fishes There are 431 species, four subspecies, four subpopulations of species, and one subpopulations of subspecies of ray-finned fish assessed as critically endangered.

Acipenseriformes Acipenseriformes includes sturgeons and paddlefishes. There are 19 species and eight subpopulations in the order Acipenseriformes assessed as critically endangered.

Acipenseridae

Species

Subpopulations

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with List of critically endangered fishes

Start with the simplest possible case. Write down what List of critically endangered fishes 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 critically endangered fishes 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 critically endangered fishes 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 critically endangered fishes

In research: List of critically endangered fishes 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 critically endangered fishes 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 critically endangered fishes is common in secondary-school and first-year university syllabi. It links to neighbouring topics Critically endangered animals, Critically endangered fish, Fish by conservation status, so understanding it makes those chapters shorter.
In everyday life: Look for List of critically endangered fishes 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 critically endangered fishes in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what List of critically endangered fishes means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain List of critically endangered fishes out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of critically endangered fishes in simple terms?

Why does List of critically endangered fishes 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 critically endangered fishes?

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 critically endangered fishes.