biology

Sparodon

Sparodon 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 Sparodon rather than just read about it. In short: Sparodon, commonly known as the white musselcracker, musselcracker seabream, mussel cracker seabream, brusher, or cracker. is a monotypic genus of fish in the family Sparidae. The type and only known species, Sparodon durbanensis, was first described and named by François Louis Nompar de Caumont de Laporte, comte de Castelnau, in 1861.

Key takeaways

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

Reference excerpt

Sparodon, commonly known as the white musselcracker, musselcracker seabream, mussel cracker seabream, brusher, or cracker. is a monotypic genus of fish in the family Sparidae. The type and only known species, Sparodon durbanensis, was first described and named by François Louis Nompar de Caumont de Laporte, comte de Castelnau, in 1861. The fish is edible and is an important food source in southern Africa.

Taxonomy Sparodon was first proposed as a monospecific genus in 1938 by the South African ichthyologist James Leonard Brierley Smith with its only species being Sargus durbanensis. Sargus durbanensis was first formally described in 1861 by the French naturalist Francis de Laporte de Castelnau with its type locality given as Durban, South Africa. The genus Sparodon is placed in the family Sparidae within the order Spariformes by the 5th edition of Fishes of the World. Some authorities classify this genus in the subfamily Sparinae, but the 5th edition of Fishes of the World does not recognise subfamilies within the Sparidae.

Etymology Sparidentex combines spar, as in Sparidae, with odon, meaning "tooth", an allusion to the four incisor-like teeth in the front of each jaw, particularly the enlarged, curved middle two teeth in each jaw. The specific name refers to the type locality.

Description S. durbanensis can grow up to a length of 120 centimetres (47 in), and a weight of around 22 kilograms (50 lb). Its head and body are colored silver or gray. It has darker colored fins and a white belly. It has large teeth and has strongly developed jaws, allowing it to eat its prey easier. The shape of the body is an elongated oval with a depth that fits into its standard length 2,5 to 3 times. The lateral line contains between 58 and 61 scales. There are no scales in the area between the eyes or on the flange of the preoperculum. The dorsal fin is supported by 11 spines and 11 or 12 soft rays while the anal fin has 3 spines and 10 soft rays.

Behavior S. durbanensis mostly stays in shallow reefs as a juvenile, in depths no greater than 12 metres (40 ft). Some adult specimens are thought to migrate northeasterly seasonally. The average length of time between two generations, called the generation time, is 13 years for the species. Young typically spawn from August to January. They can live to be around 31 years old. The species reaches 50% maturity when it is around 5+1⁄2 years old. S. durbanensis eats a variety of invertebrates commonly known as shellfish, including sea urchins, crustaceans, gastropods, and bristle worms. In addition to this, it has also been known to eat Eukaryotes in the Chlorophyta division, a group of green algae.

Distribution and conservation S. durbanensis is found in the South-east Atlantic Ocean. It mostly inhabits Southern Africa, and has not been recorded further north than the KwaZulu-Natal province. It lives in shallow coastal tropical waters, in depths of up to 80 metres (260 ft). The population of S. durbanensis is currently declining. It is listed as "Near Threatened" by IUCN. There are currently several conservation actions taking place, most notability one which limits people to two fish per day.

References

Illustrations

Worked examples

Example 1 — a first encounter with Sparodon

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

In research: Sparodon 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 Sparodon 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: Sparodon is common in secondary-school and first-year university syllabi. It links to neighbouring topics IUCN Red List near threatened species, Monotypic fish genera, Sparidae, so understanding it makes those chapters shorter.
In everyday life: Look for Sparodon 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 Sparodon in 20 minutes

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

Frequently asked questions

What is Sparodon in simple terms?

Why does Sparodon 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 Sparodon?

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 Sparodon.