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Hybrid Striped Bass: Spawning

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... are removed from the pond with a seine. stored on a hydraulic reel powered by a ... Only catfish larger than 0.5 kg are removed by partial seine harvest. ... – PowerPoint PPT presentation

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Title: Hybrid Striped Bass: Spawning


1
Hybrid Striped Bass Spawning
  • Dr. Craig Kasper
  • Hillsborough Community College
  • FAS 1012
  • Aquaculture

2
General Production
  • Intensive Extensive
  • Enhancing Phase-I Fish
  • Ensuring Quality Products

3
Morone spp.Reproduction
  • Broodstock
  • Egg maturation
  • Fry management
  • Fingerlings

4
HSB Broodstock
  • Wild adults collected by electrofishing or
    angling.
  • Spring spawning (55-68ºF.)
  • hormones used
  • ?-IM 330 IU hCG/kg bwt.
  • ?- only 150 IU hCG/kg bwt.

5
HSB Egg Collection Staging
  • Sampling begins 16 hrs. post inject.(3 mm o.d.
    cath.)
  • Check _at_ 2 hr intervals (narrow window)
  • -2 hr sb, 0.5 hr wb
  • Look at eggs microscopically
  • - eggs blood-free, oil droplet
  • coalesced (transparent)
  • chorion intact
  • - eggs will be brownish
  • Bottom line...frequent all nighters!!

6
HSB Stripping/Fertilization
  • Wet method
  • -strip eggs into metal pan with H2O
  • -add milt (sperm)
  • -sperm is activated by salinity
  • shock due to water exposure
  • Dry method
  • -strip eggs, add sperm,
  • stir eggs (turkey feather)
  • -add water

7
HSB Incubation/Hatching
  • Eggs are sticky (good in wild, but ltfucundity)
  • -Add bentonite or tannic acid
  • Incubate in MacDonald Jars/100K eggs/jar
  • Continuous flow of O2 water
  • 2-4 days hatch
  • Fry swim-up and into traugh
  • Stock _at_ 4 days post-hatch (250K/ha)

8
Future Physiology and Biochemistry
  • Broodstock
  • Determination of Essential Fatty Acids (EFA)
  • Egg Quality
  • Fry Survivability
  • Phase-I, II, III Fishes
  • EFAs
  • Isoflavones
  • a-Tocopherol
  • Phosphatidylcholine
  • Metabolism

9
CHANNEL CATFISH CULTURE IN THE UNITED STATES
BY Leonard Lovshin Department of Fisheries and
Allied Aquacultures Auburn University, AL 36849
10
Channel Catfish ( Ictalurus punctatus )
11
Native Range of Channel Catfish in the United
States
12
Food Habits
13
Preferred Habitat
Reservoirs and lakes
Rivers
14
MaximumWeight
  • The world angling record is
  • 26.4 kg caught in Santee
  • Cooper reservoir, South
  • Carolina

15
Reproductive Live History
  • 1. Sexual maturity is reached in 2 to 3 years in
    the southeastern U. S.
  • 2. Spawning takes place in a cavity formed by
    rocks, logs or a hole in a lake or river bank.
  • 3. Preferred spawning water temperatures 21-29
    C, with optimal temperature 24 to 26 C.

16
Sexual behavior
  • 1. Males defend a territory/cavity.
  • 2. Female enters the cavity and spawns.
  • 3. Males incubate eggs and defend fry.
  • 4. Males can spawn with more than one female a
    season.

Spawning cavity
17
  • Catfish are grown in 4 to 10 ha earthen ponds
    with flat bottoms.

18
Catfish ponds are filled with either
Filtered surface water or rainfall
Well water
19
Spawning in captivity
  • 1. Stock adults 3 to 8 years old
  • 2. Stock 1 male to 2 females
  • 3. Stock 800 kg of brooders/ha

male
female
20
Spawning Containers
Ammo cans
Milk cans
float
Wooden box
Boxes in spawning pond
21
Spawning occurs during May and June in the
Southeastern U. S. Spawning cans are checked
every 2 to 3 days for spawns.
22
Hatching Shed
Eggs are transported to a hatching shed.
23
Eggs are placed in 5-mm square wire mesh baskets
suspended in a paddlewheel incubator.
24
Eggs hatch in 5 to 6 days at water temperatures
of 24 to 26 C.
25
Fry are placed in screen boxes or troughs for 7
to 14 days before stocking in ponds.
Fry are fed powdered feed.
Screen bottom boxes
Fiberglass trough
26
Fry are stocked at 150,000 to 250,000/ha and
grown for 5 months.
27
Fry are fed powdered, crumbled and pelleted
feeds.
28
Fingerlings are stocked in fattening ponds during
January to March. Stocking density is 15,000 to
20,000/ha.
29
Catfish feed is purchased by the bag or delivered
in bulk and stored in silos.
30
Floating pellets are distributed by a feed blower
mounted on a truck.
Floating pellets
corn wheat soybean
31
Feed amount is controlled by an electronic
scale located in the truck cab. Catfish are fed
what they will eat up to a maximum of 120
kg/ha/day.
32
Dissolved oxygen concentration is checked night
and day to assure that levels remain above 2
mg/l.
33
Electric (fixed) and tractor (mobile) powered
paddlewheels are used to increase D. O. levels.
No water exchange is practiced because ponds are
large and pumping water is costly.
34
Low D. O. can kill catfish within 1 or 2 hours.
35
Many diseases cause fish mortality.
36
Birds consume many fish in some regions.
Shoo !
Gas cannon to scare the birds
37
Catfish are removed from the pond with a
seine stored on a hydraulic reel powered by a
tractor.
38
Management systems used
  • Monoharvest
  • All catfish are removed from the pond when they
    reach 0.5 to 1.0 kg, 6 to 12 months from
    stocking.
  • Ponds are drained yearly.
  • 2. Multi-harvest
  • Only catfish larger than 0.5 kg are removed by
    partial seine harvest.
  • Ponds are restocked yearly with small catfish.
    Large and small catfish are in the pond together.
  • Ponds are partial harvested 2 to 3 times per
    year. Ponds are drained every 5 to 8 years.

39
Catfish are retained in a holding net overnight
to eliminate small catfish. Fish are crowded for
loading onto the transport truck. A crew of 5 can
load 15,000 kg of fish in 1 hour.
40
Catfish are weighed onto trucks taking the fish
to the processing factory. Each basket holds 900
kg of fish.
scale
41
Fish are checked for off-flavor 2 weeks, 1 day
and upon arrival at the processor. Off-flavor
fish are not harvested.
42
Catfish are weighed a second time upon arrival at
the processor. Fish arrive alive.
scale
43
Catfish are cleaned, filleted and frozen by the
processor.
44
Processed forms as a percentage of total catfish
processed
whole
1. Whole - 20 2. Pieces and bellies - 20 3.
Fillets - 60 Preservation method as a
percentage of total catfish processed 1. iced
- 20 2. frozen - 80
45
The catfish industry maintains a quality control
program to insure the consumer a fresh and
healthy product.
46
Principle farming states are located in the
Southeastern U. S.. Mississippi (MS) Alabama
(AL) and Arkansas (AR) produce 90 of the
farmed catfish.
Mississippi accounts for 65 of farmed catfish
47
The channel catfish industry developed in
the Southeast because
1. Popular food fish - market
2. Warm climate
3. Abundant water and clay soils
4. Close to major grain farming regions - cheap
fish feeds
48
Pond yield
4,000 to 7,000 kg/ha/year
49
Channel Catfish Growth in Live Weight Processed
and Average Price per Kilogram, 1970 - 2002
  •  
  • YEAR LIVE WEIGHT AVG. PRICE
  • PROCESSED, KG PER
    KG, US.
  • ------- ---------------------
    -----------------
  • 1970 2,609,545 0.75
  • 1975 7,336,363 1.09
  • 1980 21,120,000 1.50
  • 1985 87,098,181 1.58
  • 163,636,360 1.69
  • 203,130,000 1.74
  • 1999 271,194,000 1.63
  • 269,819,540 1.65
  • 271,141,272
    1.43
  • 2002 286,636,810 1.25
  • Price to farmer for fish delivered to the
    processing plant

50
EAT MORE CATFISH
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