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What factors influence the choice of fishing equipment?
What factors influence the choice of fishing equipment?
What are the potential benefits of using double-net fishing?
What are the potential benefits of using double-net fishing?
How have navigational aids impacted the fishing industry?
How have navigational aids impacted the fishing industry?
Which type of fisheries is characterized by small-scale operations?
Which type of fisheries is characterized by small-scale operations?
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What is a limitation of using sails in fishing vessels?
What is a limitation of using sails in fishing vessels?
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Which of the following statements is true regarding artisanal fisheries?
Which of the following statements is true regarding artisanal fisheries?
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Why might small fishing vessels need additional weight when using sails?
Why might small fishing vessels need additional weight when using sails?
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What technology has become more widespread in fisheries, contributing to operational improvements?
What technology has become more widespread in fisheries, contributing to operational improvements?
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What was a significant advancement in the fisheries industry during the mechanization stage?
What was a significant advancement in the fisheries industry during the mechanization stage?
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What is a primary benefit of mechanization in fisheries?
What is a primary benefit of mechanization in fisheries?
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What does the term 'on-board storage' refer to in the context of fisheries?
What does the term 'on-board storage' refer to in the context of fisheries?
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Why might small-scale fisheries restrict fishing trips to a single day?
Why might small-scale fisheries restrict fishing trips to a single day?
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How can extended fishing trips beyond a single day be challenging?
How can extended fishing trips beyond a single day be challenging?
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What aspect of diesel power contributed to cost-effectiveness in fishing trips?
What aspect of diesel power contributed to cost-effectiveness in fishing trips?
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What equipment is mentioned that aids fishermen in locating fish?
What equipment is mentioned that aids fishermen in locating fish?
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Why is it difficult to increase a fishing vessel's autonomy?
Why is it difficult to increase a fishing vessel's autonomy?
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What has been a significant result of increased fish production in Egypt over the years?
What has been a significant result of increased fish production in Egypt over the years?
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Why are fisheries considered renewable resources?
Why are fisheries considered renewable resources?
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What is a contributing factor to the unfair exploitation of fisheries?
What is a contributing factor to the unfair exploitation of fisheries?
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What is primarily needed to address overfishing in many countries?
What is primarily needed to address overfishing in many countries?
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What aspect of fish stocks is crucial to the study of fisheries science?
What aspect of fish stocks is crucial to the study of fisheries science?
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Which of the following statements about underwater fisheries is accurate?
Which of the following statements about underwater fisheries is accurate?
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What has driven the increase in global fish catch over the decades?
What has driven the increase in global fish catch over the decades?
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What should the policies related to fisheries focus on?
What should the policies related to fisheries focus on?
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What is the primary function of sonar in fishing vessels?
What is the primary function of sonar in fishing vessels?
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What principle does sonar work on to determine distances?
What principle does sonar work on to determine distances?
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Which feature of synthetic fibers makes them preferable for fishing nets over natural fibers?
Which feature of synthetic fibers makes them preferable for fishing nets over natural fibers?
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At what speed does sound travel in water, as mentioned in the context?
At what speed does sound travel in water, as mentioned in the context?
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How is the depth of water typically determined using sonar?
How is the depth of water typically determined using sonar?
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What is an advantage of using synthetic fibers in fishing nets?
What is an advantage of using synthetic fibers in fishing nets?
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Sonar devices are also used in which of the following applications?
Sonar devices are also used in which of the following applications?
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Which of the following is NOT a feature of synthetic fibers used in fishing nets?
Which of the following is NOT a feature of synthetic fibers used in fishing nets?
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Study Notes
Fishing Methods Technology
- Global fish exploitation is increasing, rising from 19 million tons in 1950 to 92 million tons in 2024.
- In Egypt's Mediterranean fishery, fish production doubled in just 17 years, from 40,000 tons in 1991 to 84,000 tons in 2024.
- Increased catches have come at the expense of some fish groups, which have almost disappeared due to unsustainable fishing practices.
- Many internationally prohibited fishing methods exist.
Goal of Studying Fisheries Science
- Understanding fisheries is essential due to exploitative practices.
- Identifying available fish stocks and maintaining catches is crucial.
- Understanding current fisheries status and fishing technology (safe vs. harmful) is vital.
- Creating management solutions and policies for sustainable fisheries is necessary.
Fisheries as a Resource
- Fisheries are renewable resources.
- Exploitation is often unfair in many instances as they are common property of many countries.
- Lack of controls and fishing licenses leads to biological and economic exploitation.
Some Fisheries Challenges
- Some fisheries, especially inland ones, can remain highly exploited due to primitive techniques, lack of equipment and limited distribution markets.
- Demand in some countries for aquatic life as a protein source has led to overfishing and the need for operational reorganization.
Stages of Fisheries Industry Development
- Fishing, though ancient, became an industry only in the early 19th century.
- Three major steps are vital to its development: mechanization, development of fishing technology, and advancements in on-board storage and preservation.
- Early mechanization used diesel, allowing boats to maneuver further from land increasing catch size.
- Development of storage allowed vessels to stay at sea longer.
Sonar Technology
- Sonar helps link fishing fleets and identify fish gatherings.
- Traditional methods relied on fishermen's expertise. Sonar allows for detection of fish schools.
- Sonar works by sending sound pulses that return when they hit an object, allowing for precise distance calculations, which helps determine the size of the fish gathering.
Sonar Device's Function
- Sonar is a sensor that uses sound waves to locate objects underwater.
- It is also known as a marine probe.
- Used by fishing vessels to find fish schools.
- Used in ship recovery for finding sunken ships.
- Used in aircraft and warships to locate enemy submarines.
- Useful in determining water depth.
Synthetic Fibers Usage
- Synthetic fibers are used in fishing nets instead of natural fibers due to their lightweight nature, lack of need for frequent cleaning and maintenance, and reduced visibility in water.
- Other benefits include higher-quality knots, resistance to decay, and easy storage.
- These synthetic fibers are widely beneficial for the modern fishing industry.
Fisheries Technology
- Fisheries technology encompasses the fishing fleet, equipment, and related infrastructure for fish production, including ports, coastal services, repair facilities, and transportation.
- Type of fish, investment conditions, environmental parameters, vessel type all dictate the type of fishing equipment used in any specific case.
Net Fishing Types
- Double-net fishing vessels are sometimes used as an alternative to traditional single-net vessels in small-scale fisheries.
- Double-net fishing can reduce costs.
- Satellite navigation devices and echo sounders provide better safety and wider areas for exploration.
- These methods contribute to increased yields and safety.
Fisheries Categories
- Fisheries can be categorized by technology.
- Artisanal fisheries (small-scale), often operate with small, locally developed units supporting a substantial portion of global fishing yields and human consumption.
Fishing Vessel Types
- Sailing vessels are sometimes used, particularly in small fishing boats; though increasingly less common due to the prevalence of engine-powered vessels.
- Sail use requires specific conditions, crew skills, and vessel design.
- Use of sails, when feasible, contributes significantly to fuel savings.
FAO Fishing Gear Classification
- FAO (Food and Agriculture Organization of the United Nations)
- Provides classification of fishing gear: Traps, hooks, lines, nets of various types, including gill nets, seines, trawls, dredges, grabbling devices.
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Description
Explore the impact of fishing practices on global fish stocks and fisheries resources. This quiz delves into unsustainable fishing methods, the need for effective management, and the importance of maintaining healthy fish populations. Test your knowledge on the dynamics of fisheries science and environmental sustainability.
