Problem Area 3 Fish Management. Next Generation Science / Common Core Standards Addressed HS ‐ LS4 ‐ 5. Evaluate the evidence supporting claims that changes

Problem Area 3

Fish Management

Next Generation Science / Common Core Standards Addressed

• HS‐LS4‐5. Evaluate the evidence supporting claims that changes in environmental conditions may result in: (1) increases in the number of individuals of some species, (2) the emergence of new species over time, and (3) the extinction of other species. [Clarification Statement: Emphasis is on determining cause and effect relationships for how changes to the environment such as deforestation, fishing, application of fertilizers, drought, flood, and the rate of change of the environment affect distribution or disappearance of traits in species.]

Bell Work / Objectives

• Discuss terms used for aquaculture and fish anatomy.

• Identify major species used in aquaculture.• List management and nutrient requirements

of aquaculture.• Describe freshwater and saltwater

aquaculture production systems.• Explain harvesting an marketing of

aquaculture products

Terms

• Alligators• Aqua crop• Aquaculture• Bluegill• Fish• Freshwater• Fry• Hatchery• Lobsters• Prawn

• Production cycle• Raceways• Saltwater• Shrimp• Spring water• Surface runoff• Tilapia• Water facility• Water quality• Well water

Exploring the Aquaculture Industry• If you were to go to a fish hatchery, what

questions would you like to ask?

What are terms used in aquaculture?

• Aquaculture– Production of aquatic vegetation and animals.

• Aqua crop– Commercially produced water species

• Freshwater– Water that contains little or no salt

• Saltwater– Water containing over 16.5 parts per

thousand of salt


• Fish– Animals that have gills instead of

lungs and are vertebrates (having backbones)

• Hatchery– A facility where eggs are incubated

and hatched by artificial means

• Fry– A newly hatched fish


• Water quality– Used to describe how suitable

water is to a specific use• Surface runoff

– Water that is not absorbed by the soil from rain

• Well water– Water drawn up by wells from

underground aquifers• Spring water

– Water from natural openings in the earth and the quality is similar to well water

What major species are used in aquaculture?

• Shrimp– Name used to describe

approximately 2,000 species of crustaceans.

– Mainly bottom dwellers and scavengers.

– Feed slowly on both plant and animal organisms.


• Prawn

– Any large shrimp


• Lobsters– Crustaceans with

hard shells that live in saltwater.

– Found on the bottom of the ocean under rocks and in holes.

– Eat other lobsters, crabs, snails, and small fish.


• Alligators– Large reptiles used

for meat and hides.– Farms are found in

the Southern states including Mississippi and Louisiana.


• Frogs– Legs of bullfrogs are

used for meat and in great demand.

– Also used for research.

– Hard to raise commercially due to their complex life cycle.

– Generally “gigged” in southern waterways, a lucrative hobby.


• Eels– Used for food

especially in Japan.– Elvers are raised in

ponds.– Caught by

fisherman in their natural environments.


• Fish - Tilapia– Fish well suited for

aquaculture.– Originally found if Africa.– Grow and reproduce very

quickly.– Sensitive to cold

temperatures.– Used to control vegetation

in ponds and lakes.

• Fish – Catfish• The easiest of the

commercial fish to raise on a farm as an alternate crop.

• Warm water / hot climate areas of the southern US are the largest areas of production.


• FISH - Bluegills– A sunfish that has

a deep compressed head and a small mouth.

– Fairly easy to produce.

– Well adapted to various climates.


• Trout– A cold water species

popular in the US.– Cold water species tend

to be slower growing.– Not found as commonly

on restaurant menus as their warm water cousins.

– Commonly raised in cooler climates.

– Salmon is also becoming more common in commercial operations.

How do you manage and feed aquaculture species?

• Production cycle– The complete production of a crop from seed

stock to market size.– Water environments can be complex, careful

feed and management is required for a profitable business.


• Animals will become diseased and inefficient if they are malnourished– Proper amount of protein, fat, minerals,

carbohydrates, and vitamins must be fed according to type of animal raising.

• There are natural foods and man-made feeds used in aquaculture.


• Natural foods– Foods that grow

naturally.– Example: plankton– Harvested and fed

to aqua crops.

• Man-made feed– Produced

according to the needs of what type of animal you are producing.


• Management includes– Monitoring facilities– Monitoring

equipment– Maintaining water

quality is essential.

What are freshwater and saltwater production systems like?

• The aquatic environment you create for your species depends on what is necessary for it to survive.

• Water facility– The environment or structure in which your

aqua crop is raised.


• Ponds– Made by humans or created by nature– Vary in size– Cannot have flowing water– Designed for easy harvesting– Usually freshwater– Usually 3 to 5 feet deep– Monitor for excessive vegetation and water

quality.


• Raceways– human-made– use flowing water– normally long, narrow and 3

to 4 feet deep– advantage is having more

oxygen and carrying waste away.

– disadvantage is having to use pumps and more water.


• Tanks– Made of metal,

concrete, fiberglass and other materials.

– Come in various shapes and sizes.

– Management is easier because of smaller size.


• Pens and cages– Materials used to

confine species to a small area in a very large body of water.

– Used to make harvesting and managing aqua crops easier.

How do you harvest aqua crops?

• Harvesting and marketing aqua crops vary with species and production systems.– Harvesting

• The capturing of fish used for consumption.• Fish raised in tanks are easy to harvest

because of size.• Dip nets are used to harvest from tanks.• Seine is used to harvest from raceways.• Ponds are more complicated to harvest

because the pond may need to be drained or large equipment is required.

How do you market aqua crops?

• Marketing of aquatic products can be direct or indirect– Direct marketing

• Simple• Sell right to consumer

– Indirect marketing• Complex• Product is changed and then sold to others

who will sell the products to consumer.

How do you market aqua crops?

• Marketing is only as good as the market for the product.

• Always make sure you have a dependable buyer for your products before you invest the money to grow them.

Review / Summary

• What are terms used in aquaculture?• What major species are used in

aquaculture?• How do you manage and feed aquaculture

species?• What are freshwater and saltwater

systems like?• How do you harvest and market aqua

crops?

The End!

Documents

Problem Area 3 Fish Management. Next Generation Science / Common Core Standards Addressed HS ‐ LS4 ‐ 5. Evaluate the evidence supporting claims that changes