Catfish Wars - University of California,...
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ANS 18 ANS 18 - CATFISH vs BASA CATFISH vs BASA 18 18 “David” = Vietnamese cage culture of Asian catfish “Goliath” = U.S. pond culture of catfish Catfish Wars Catfish Wars
Transcript of Catfish Wars - University of California,...
ANS 18ANS 18 -- CATFISH vs BASACATFISH vs BASA 1818
“David” =Vietnamese cageculture of Asian
catfish
“Goliath” =U.S. pondculture of
catfish
Catfish WarsCatfish Wars
Salmon LifeCycle
EelLifeCycle
1. Leptocephalus ~ 0.2”
(glass eels ~ 1 – 2”)
2. Elver
3. Adult
ProductionCycle
7-8 yr old3-yr
Caviarmarket
Females(sacrificed)
Males
Meatmarket(live orwhole torestaurant)
Cobia Larval Rearing = 28 – 30oC
• Hatching – larvae = 3.5 mm in length
• 3 – 7 dph = Enriched rotifers
• 5 – 7 dph = Brine shrimp nauplii
• 7 – 15 dph = Enriched 2nd – 3rd instar meta nauplii
• 15 – 25 dph = weaned to formulated feeds
200 – 350 μm
1.5 mm
• Fingerlings = 1 gram 75 dph = 30 grams
*
* Although the timing varies, the sequence of feed types istypical for marine fish larval culture
Green-waterTechnique
80%mortality
mortality nil
Oyster Life Cycle “D-stage”veligerlarvae
Late veliger or“eyed” larvae
Mollusk Life Cycle “D-stage”veligerlarvae
Late veliger or“eyed” larvae
Pearl grafting
Bead or nucleus plus a pieceof mantle from donor oyster
ANSANS –– 18; Abalone Culture18; Abalone Culture 2828
PostPost--larval Feedinglarval Feeding
Molting =Growth
Molt cycle
Controlled by twohormones;ecdysone & themolt inhibitinghormone
Feeding - Polytrophismresidual fromvegetation thatgrows during thedry period - baseof a detritus foodweb - typicalharvests of ~ 600kg/ha/yr (withoptimumconditionsharvests can beup to 3 mt/ha/yr).
Plant materialMicrobially
enriched detritus
ZooplanktonSubstrate
Invertebrates
> 25oC
BURROW
Growth = 2 – 3”/monthmarket size in < 2 years
55.06
44.05
20.04
9.53
5.02
2.01
Weight (lbs)Length (ft)
typical
harvest
size
