Download Aquaculture PPt 3

Mariculture
The husbandry of marine or
saltwater organisms
Major Species of Fish (KY)
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1st Catfish
Prawn (Freshwater)
Trout
Large Mouth Bass
Hybrid Striped Bass
Paddlefish
Musky
Baitfish
Minor Species (KY)
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Walleye
Common Carp
Yellow Perch
Tilapia
Crappie
Crayfish
Hybrid Bluegill
External Anatomy
1.
Lateral Line – sensory organ that senses water currents,
pressure, and movement in the water
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Operculum – a bony flap-like protective gill cover
3.
Scales – a plate-like protective covering of the skin
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Caudal Fin – the tail fin of fish, provides thrust/movement
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Pectoral Fin – the chest fins, provides maneuvering
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Pelvic Fin – the hip fins, provides maneuvering
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Dorsal Fin – the back fin, provides maneuvering
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Nostrils/ Nares – opening of the nasal cavity, detects odors in water
(feed/danger)
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Vent – an external opening to the digestive and reproductive tract
Internal Anatomy
1.
Swim Bladder – (air bladder) an internal, inflatable gas bladder that
enables a fish to regulate its buoyancy
2.
Gills – an internal organ used in respiration and excretion
3.
Liver – internal organ that breaks down fat, stores fat and
carbohydrates, excretes waste, and maintains proper blood
chemistry
4.
Gonads – the reproductive organs, testes or ovaries
Catfish Production
1. Catfish is the largest enterprise of all aquacultural
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products.
Today there are over 150,000 acres of catfish ponds in
the United States.
They are raised in the southern part of the U.S.
because they are warm-water fish.
Warm-water fish grow best in water temperatures
around 85 degrees.
Mississippi leads the nation in catfish production.
Broodfish
• The production of catfish begins with the
breeding process. (Selective Breeding)
• Brood fish range from 3 to 5 lbs.
• Brood ponds are used to keep fish that are
used to breed and lay eggs.
Roe/Eggs
• The female catfish lays approximately
10,000 eggs.
called “roe” at a time.
• Next, the male fertilizes the eggs by
depositing sperm into the mass of eggs.
• Egg hatching occurs in 7 to 8 days.
Fry
• After eggs hatch, the small fish are called
“fry”.
• Up to 1 inch length
• From birth to 4 to 8 months
Fingerlings
• Fry develop into fingerlings
• 4 to 8 months
• Fingerlings are 1 to 8 inches
Stockers
• Fingerlings develop into “stockers”
• Stockers are ¾ of a pound.
Foodfish
• Stockers develop into foodfish
• 1 to 2 pounds
• Selected fish are then taken to market
Broodfish
• Choice foodfish males and females are
kept for breeding purposes.
• These are known as broodfish
• Cycle begins again.