Presentation on theme: "1.Read the following online: 2.SRAC pub: 2403 (crawfish) SRAC 0483 Freshwater Prawns: Biology and Life History SRAC."— Presentation transcript:
http://srac.tamu.edu/index.cfm?catid=9 1.Read the following online: 2.SRAC pub: 2403 (crawfish) SRAC 0483 Freshwater Prawns: Biology and Life History SRAC 0484 Pond Production of the Freshwater Prawn in Temperate Climates SRAC 4830 Economics of Freshwater Prawn Farming in the United States 3. Hybrid striped bass: SRAC 0300 Hybrid Striped Bass: Biology and Life History SRAC 0301 Hybrid Striped Bass: Hatchery Phase SRAC 0302 Hybrid Striped Bass: Fingerling Production in Ponds SRAC 0303 Hybrid Striped Bass: Pond Production of Foodfish 4.Trout: SRAC 0220 Trout Production: Handling Eggs and Fry
Stages of Culture - Trout Broodstock Spawning Egg incubation Fry culture Fingerling production Growout
Broodstock Females are 2 to 3 years old –Can be used for more than one year but may have decreased egg quality and quantity Males are 2 to 3 years old –Can be used several times in one spawning season but not for more than one year
There are six species of salmon in the Pacific Northwest. The largest salmon, the Chinook, can reach over 6 feet in length and weighs over 100 pounds.
Atlantic Salmon stock enhancement - collection of wild broodstock
In the fall, salmon deposit eggs in the gravel of flowing streams. Eggs hatch in the spring, and the alevin grow quickly. Later, the fingerlings continue to grow toward maturity in the streams near their birthplace. When they become strong enough to swim in rushing currents, and quick enough to escape their enemies, the salmon begin migrating to the sea. Salmon can grow to be over 100 pounds as they feast in the nutrient- rich waters of the ocean. When full grown, the beautiful, silvery fish begin their migration back to the waters of their birth. As they get closer to their spawning grounds, salmon change in their appearance. Some salmon travel over 1000 miles to lay their eggs. After spawning (laying eggs), the salmon die sometimes inches from where they were hatched! Amazing instincts! The Salmon Life Cycle
Tiny alevin grow quickly after being hatched. When they are as long as your fingernail, they are called fry, and look like real fish! When they get to be about as long as your longest finger, they are given a new name -- smolt. As the smolt grow, they eventually begin their migration to the ocean. Alevin Smolt Ocean Bound!
Salmon Growout ExtensiveExtensive Net PensNet Pens Hills Island Salmon Farm, Canada
Salmon - Extensive Culture Culture fingerlings in tanks Stock fingerlings (smolts) into native streams Fish will migrate to the ocean and undergo smoltification Fish will live in open ocean for approximately 3 years Fish will return to stream they were planted (chloramine-T, Seattle) Can be harvested when they return and before they die Approximately 1 in 1000 return
Salmon Net Pens Stocking density 8 – 14 kg/m 3, but 75 kg/m 3 possible!Stocking density 8 – 14 kg/m 3, but 75 kg/m 3 possible! Feeding by hand, or electronic (SONAR)Feeding by hand, or electronic (SONAR) Atlantic salmon ~80% of net pens in the Pacific Northwest and Canada.Atlantic salmon ~80% of net pens in the Pacific Northwest and Canada. Why Atlantic salmon in Pacific????Why Atlantic salmon in Pacific???? –Better FCR, higher survival, better dressout %. Escapees of Atlantic salmon into Pacific Ocean problem?Escapees of Atlantic salmon into Pacific Ocean problem? –Not yet! Escapees experience high mortality, poor high mortality, poor reproduction, do not spawn reproduction, do not spawn with Pacific salmon with Pacific salmon
Total production 23,067,973 metric tons & valued at US $ 31,565,104,100 in 2000 FILTER FEEDING CYPRINIDS PELLET FEEDING CYPRINIDS OTHER FRESHWATER FISHES SALMONIDS TILAPIA MARINE FISHES CATFISHES MILKFISH EELS Figure 1.2.10 Total finfish aquaculture production by major species groups in 2000 (values expressed as % by weight) CATFISH
Credits Pictures and diagrams found in this photo essay are courtesy of: The Alaskan Department of Fish and Game The Washington Department of Fish and Game The Army Corps of Engineers The US National Marine Fisheries
These salmon are on their way to the ocean where they may live for 1-5 years, depending on the species, before returning to the rivers and streams to spawn (lay eggs). Only one salmon out of a thousand salmon survives to return to the river to spawn. What are some possible reasons why such a small percentage of salmon actually live long enough to lay eggs?
Going home! These salmon are on their way back to the waters of their birth. Scientists do not know how salmon find the exact location of their birthplace, but their sense of smell (and the chemical signature of the waters) is an important cue. Along the way are many hazards – some more hungry than others!
Replenishing Nutrients When salmon die after spawning, they provide nutrients to plants and animals near the rivers in which they swam. It has been found that 20 % of the nitrogen (an important element for all living things) in evergreen trees that grow next to salmon spawning waters in Alaska actually was carried upstream with salmon. These nutrients are essentially transported from the ocean to the headwaters by the salmon.
By Leonard Lovshin Department of Fisheries and Allied Aquaculture Auburn University, Alabama, USA Rainbow Trout culture
Distribution 1. Native – Western U. S., western Canada, Alaska and Western Pacific. 2. Introduced – Eastern U. S. and most of the temperate climate world. Oncorynchus mykiss
Rainbow trout live their entire life cycle in fresh water Steelhead are a rainbow trout that lives most of its life in the ocean but returns to fresh water to spawn. Male Female
Food Habits – insects, crustaceans and fish Water Quality 1. Dissolved oxygen – above 5 mg/l 2. Needs water of good quality Sexual maturity – 2 to 3 years old
Should not be above 22 0 C and ideal for good growth is 13 to 18 0 C Water temperature
Rainbow trout are a popular sport fish. The world record taken by rod and reel is 19.1 kg
Reproduction 1. Nature - Spawns in the Spring and needs water below 12 0 C for 6 months to produce good quality eggs. Females spawn eggs over gravel beds in stream riffle areas.
Captivity – Eggs are stripped from ripe females and sperm is stripped from males and mixed in a bowl. Reproduction
Eggs are artificially incubated and will hatch in 50 days at 7 0 C and 20 days at 15 0 C. Water upwelling incubator
Fry are large when they begin to swim and can be fed with powdered formulated diets at first feeding.
Culture 1.Most trout are raised in raceways with abundant flowing water. Some trout are raised in earthen ponds with water exchange and in cages. 2. The environment, stocking density, fish growth and feeding rate are highly controlled. 3. Trout culture is divided into 3 types depending on the trout harvested. a. pink pan-sized b. white pan-sized c. salmon trout; larger than 1 kg
Trout are graded to maintain uniform size in a raceway
Trout harvest with lift basket in North Carolina Trout harvest in Idaho with a fish pump.
Sludge Removal from a Raceway Effluent Settling Tank
Rainbow trout are often raised in cages to weights larger than 1 kg
1.Whole, gutted 2.fillets Market Products Golden variety of rainbow trout
World Production of Rainbow Trout in 1999: 418,654 metric tons Leading Producers in 2001: 1. France – 47,500,000 kg 2. Norway – 60,000,000 kg ( all large trout, >1 kg ) 3. Italy – 44,000,000 kg 4. Denmark – 37,000,000 kg
U.S. annual production: 56.9 million lbs (2001) 9 % of total finfish production in U. S. 1.Idaho39,500,0000.87 2. N. Carolina 5,550,0001.10 3.Washington 2,590,0001.00 4.California 2,500,000 2.05 5.Pennsylvania 1,640,0002.50 StateProduction, lbPrice/lb
Advantages 1. Best cold water fish available 2. Grows well 3. Ease of reproduction and fingerling production 4. Good quality flesh 5. Easy to harvest 6. Stock at high densities 7. Accepts pelleted diets Disadvantages 1. Not tolerant of warm water temperatures 2. Not resistant to poor water quality and disease 3. Feeds high on the food chain