science

Moedjair

Moedjair 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 Moedjair rather than just read about it. In short: Moedjair or Mujair (1890–1957) is a Javanese inventor who in 1939 was the first to culture the fish species Tilapia zillii, at the mouth of the Serang River, in the northern reaches of Java Island. Moedjair was born Iwan Dalauk in 1890 in Blitar, East Java; he died there in 1957.

Key takeaways

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

Reference excerpt

Moedjair or Mujair (1890–1957) is a Javanese inventor who in 1939 was the first to culture the fish species Tilapia zillii, at the mouth of the Serang River, in the northern reaches of Java Island.

Moedjair was born Iwan Dalauk in 1890 in Blitar, East Java; he died there in 1957.

Experimentation with fish In 1939, Mudjair went looking for fish at the river estuary along coast. He noticed a strange fish that fed its children when in danger and spit back when they reached safety. Wishing to bring a specimen home, Moedjair questioned whether the fish would survive a non-saltwater environment. Experimenting with freshwater habitats, he demonstrated 4 fish can live in saltwater after 11 experiments. These 4 fish, released in rivers and lakes, quickly grew in population. To honor his work, the fish was named mujair in Indonesian, and mujair is now a popular freshwater fish in Indonesia.

References

Illustrations

Worked examples

Example 1 — a first encounter with Moedjair

Start with the simplest possible case. Write down what Moedjair 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 Moedjair 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 Moedjair 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 Moedjair

In research: Moedjair 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 Moedjair 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: Moedjair is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1890 births, 1957 deaths, Fisheries and aquaculture research institutes, so understanding it makes those chapters shorter.
In everyday life: Look for Moedjair 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 Moedjair in 20 minutes

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

Frequently asked questions

What is Moedjair in simple terms?

Moedjair or Mujair (1890–1957) is a Javanese inventor who in 1939 was the first to culture the fish species Tilapia zillii, at the mouth of the Serang River, in the northern reaches of Java Island. Moedjair was born Iwan Dalauk in 1890 in Blitar, East Java; he died there in 1957.

Why does Moedjair matter?

Because it connects several science 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 Moedjair?

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 Moedjair.