science

Sidney Holt

Sidney Holt 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 Sidney Holt rather than just read about it. In short: Sidney J. Holt (28 February 1926 – 22 December 2019) was a British biologist who was a founder of fisheries science.

Key takeaways

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

Reference excerpt

Sidney J. Holt (28 February 1926 – 22 December 2019) was a British biologist who was a founder of fisheries science. He was best known for the book On the Dynamics of Exploited Fish Populations which he published with Ray Beverton in 1957. The book is a cornerstone of modern fisheries science and remains much used today. Holt served with the FAO in 1953 and with other UN agencies for another 25 years. After his retirement in 1979, Holt remained active in work related to the International Whaling Commission and conservation of whales in general, also publishing his views about whaling and fisheries management in academic journals.

Achievements Much of the foundations of quantitative fisheries science were laid out in the book On the Dynamics of Exploited Fish Populations which Beverton and Holt wrote at the Fisheries Laboratory in Lowestoft (UK). In his review of the 1993 reprint of the book, Ray Hilborn writes "It is remarkable how the book has stood the test of time and still provides a survey of the important topics in fisheries management." The book was reprinted in 2004 with a new foreword by Holt. Holt's later achievements mostly related to whaling. According to Beverton, Holt "saved the great whales in the early 1970s". The legacy of the 1957 Beverton and Holt treatise is commemorated in the volume Advances in Fisheries Science. 50 years on from Beverton and Holt. The volume includes a foreword by Holt. Outside fisheries science, Holt is best known for the Beverton–Holt model. In population ecology the model is used as a stand-alone discrete time population model or as a model of density dependence in larger population models. Originally the model had a more specific usage; it was devised to describe the dependence of recruitment on spawning stock biomass.

The International Whaling Commission (IWC) and The Committee of Three Holt worked on the International Whaling Commission's panel termed The Committee of Three that found new methods to calculate whaling quotas. The group analyzed whaling data (catches, the number of whaling boats etc.) to come up with proposals for annual quotas for whales. The panel's report, in 1961, was the international whaling commission's first attempt to come up with quotas that would permit whaling while allowing the whale population to increase. The three scientists on the panel (Kenneth Radway Allen, Douglas G. Chapman and Holt) were selected because they specialized in fisheries research but were not officially connected with Norway, the Soviet Union, the Netherlands, Japan or Britain, the countries conducting the whaling they were to study. The quotas recommended were so much lower than usual that the whaling countries argued over them for many years but eventually they had to lower the quotas. However the whaling countries first adopted interim, compromise quotas which were higher than recommended.

See also Population dynamics of fisheries

References

External links Sea Shepherd Welcomes Dr. Sidney Holt to the Advisory Board (February 2010)

Worked examples

Example 1 — a first encounter with Sidney Holt

Start with the simplest possible case. Write down what Sidney Holt 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 Sidney Holt 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 Sidney Holt 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 Sidney Holt

In research: Sidney Holt 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 Sidney Holt 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: Sidney Holt is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1926 births, 2019 deaths, 20th-century British zoologists, so understanding it makes those chapters shorter.
In everyday life: Look for Sidney Holt 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Sidney Holt” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Sidney Holt in 20 minutes

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

Frequently asked questions

What is Sidney Holt in simple terms?

Sidney J. Holt (28 February 1926 – 22 December 2019) was a British biologist who was a founder of fisheries science.

Why does Sidney Holt 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 Sidney Holt?

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 Sidney Holt.