biology

Mexican dace

Mexican dace 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 Mexican dace rather than just read about it. In short: The Mexican dace (Evarra bustamantei), or Mexican chub, is an extinct species of ray-finned fish in the family Leuciscidae. It was found only in Mexico, in the canals and streams of the Valley of Mexico.

Key takeaways

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

Reference excerpt

The Mexican dace (Evarra bustamantei), or Mexican chub, is an extinct species of ray-finned fish in the family Leuciscidae. It was found only in Mexico, in the canals and streams of the Valley of Mexico. It is estimated to have become extinct circa 1983. The extinction of this species coincided with the drying of water bodies in the valley. This drying was a result of the increasing demands placed on the water resources of the valley by agriculture, as well as by the growth of Mexico City and its suburbs.

Sources

Worked examples

Example 1 — a first encounter with Mexican dace

Start with the simplest possible case. Write down what Mexican dace 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 Mexican dace 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 Mexican dace 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 Mexican dace

In research: Mexican dace 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 Mexican dace 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: Mexican dace is common in secondary-school and first-year university syllabi. It links to neighbouring topics Endemic fish of Mexico, Evarra, Fish described in 1955, so understanding it makes those chapters shorter.
In everyday life: Look for Mexican dace 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 Mexican dace in 20 minutes

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

Frequently asked questions

What is Mexican dace in simple terms?

Why does Mexican dace 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 Mexican dace?

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 Mexican dace.