biology

Red rainbowfish

Red rainbowfish 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 Red rainbowfish rather than just read about it. In short: The red rainbowfish or salmon-red rainbowfish (Glossolepis incisa) is a species of rainbowfish from Lake Sentani in Irian Jaya, Indonesia. Belonging to the family Melanotaeniidae, in the subfamily Melanotaeniinae, the Australian rainbowfishes.

Key takeaways

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

Reference excerpt

The red rainbowfish or salmon-red rainbowfish (Glossolepis incisa) is a species of rainbowfish from Lake Sentani in Irian Jaya, Indonesia. Belonging to the family Melanotaeniidae, in the subfamily Melanotaeniinae, the Australian rainbowfishes. It is threatened in its native range, but easily bred in captivity and common in the aquarium trade.

Description

The males are bright red and with age grow a high back. The females are olive brown in colour. Their colours change depending on their mood, but subordinate males do not display bright colours. They grow up to 15 cm (5.9 in) in size, but typically attain a smaller size of around 12 cm (4.7 in).

Breeding They are an egg scattering species and they scatter their eggs among clumps of vegetation. The eggs take about 7 days to hatch.

Nutrition Glossolepis incisus is an omnivore and in captivity it will eat most common commercial aquarium foods readily. It may be slightly more carnivorous than most of the Australian rainbowfish.

Conservation status The IUCN Red List classifies Glossolepis incisa as endangered. This is because of the rapidly increasing human population around this fish's only natural habitat and introduced species such as tilapia.

Distribution This species is endemic to Lake Sentani and its tributaries near Jayapura in Papua, Indonesia (a range it shares with the related Chilatherina sentaniensis).

Taxonomy Glossolepis incisa is the type species of the genus Glossolepis and was described by Max C.W. Weber in 1907. The name is virtually always misspelt as "incisus." However, the genus name (Glossolepis) is feminine, and the specific taxon must follow form.

References

Illustrations

Worked examples

Example 1 — a first encounter with Red rainbowfish

Start with the simplest possible case. Write down what Red rainbowfish 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 Red rainbowfish 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 Red rainbowfish 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 Red rainbowfish

In research: Red rainbowfish 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 Red rainbowfish 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: Red rainbowfish is common in secondary-school and first-year university syllabi. It links to neighbouring topics Atheriniformes stubs, Fish described in 1907, Fishkeeping, so understanding it makes those chapters shorter.
In everyday life: Look for Red rainbowfish 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 Red rainbowfish in 20 minutes

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

Frequently asked questions

What is Red rainbowfish in simple terms?

Why does Red rainbowfish 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 Red rainbowfish?

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 Red rainbowfish.