biology

Spearfish remora

Spearfish remora 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 Spearfish remora rather than just read about it. In short: The spearfish remora (Remora brachyptera) is a species of remora with a worldwide distribution in tropical and subtropical seas. Remoras attach themselves to other fish with a sucker on the head and this fish is almost exclusively found living on billfishes or swordfishes, and sometimes on sharks.

Key takeaways

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

Reference excerpt

The spearfish remora (Remora brachyptera) is a species of remora with a worldwide distribution in tropical and subtropical seas. Remoras attach themselves to other fish with a sucker on the head and this fish is almost exclusively found living on billfishes or swordfishes, and sometimes on sharks.

Description This species can reach 50 cm (20 in) in total length, though most do not exceed 25 cm (10 in). It is an elongated cylindrical fish, usually whitish or pale blue in life, but tan or dusky-brown when dead. The rather flattened head has an oblong disc or sucker with 14 to 17 transverse plates with which it clings to its host. The dorsal and anal fins are long and set far back on the body. The dorsal fin has between 27 and 34 soft rays, the pectoral fin has 23 to 27 rays and the anal fin 25 to 34 rays. The caudal fin has a straight edge. The sucker reaches no further than the pectoral fins, and the outer two-thirds of the pectoral rays are flexible. There are up to 21 gill rakers in the first branchial arch.

Biology The spearfish remora attaches itself with its disc to a host fish, with juveniles often attaching in the gill chambers. Host fish include the sailfish, the white marlin, the black marlin, the striped marlin and the swordfish; all of these fish swim faster than the remora, and it is not clear how the remora attaches to the host in the first place. The remora can move about the body surface of its host and is capable of short bursts of independent swimming. The diet includes parasitic copepods removed from the body of the host, but these do not seem to form such a large percentage of the diet of the spearfish remora as it does for the common remora (Remora remora). Although more than one remora can attach to a single host, it is not clear how remoras come together to breed.

References

External links Photograph

Illustrations

Worked examples

Example 1 — a first encounter with Spearfish remora

Start with the simplest possible case. Write down what Spearfish remora 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 Spearfish remora 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 Spearfish remora 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 Spearfish remora

In research: Spearfish remora 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 Spearfish remora 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: Spearfish remora is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cosmopolitan fish, Fish described in 1839, IUCN Red List least concern species, so understanding it makes those chapters shorter.
In everyday life: Look for Spearfish remora 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 Spearfish remora in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Spearfish remora 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 Spearfish remora out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Spearfish remora in simple terms?

Why does Spearfish remora 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 Spearfish remora?

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 Spearfish remora.