sea bass aquaculture
DESCRIPTION
Sea Bass Aquaculture. By: Eric Brown. European seabass ( Dicentrarchus labrax ) Sometimes marketed as Mediterranean Sea Bass. Black Sea Bass ( Centropristis striata ) Spotted Sea Bass ( Lateolabrax japonicus ). What species are used?. Reproduction. Spawn in groups - PowerPoint PPT PresentationTRANSCRIPT
Sea Bass AquacultureBy: Eric Brown
What species are used?European seabass (Dicentrarchus labrax)
Sometimes marketed as Mediterranean Sea Bass.
Black Sea Bass (Centropristis striata) Spotted Sea Bass (Lateolabrax japonicus)
Reproduction
Seabass Life Cycle• Spawn in groups•External fertilization•Eggs pelagic•2-4 year Sexual maturity•Longer in Atlantic Ocean•Spawn once a year•Embryos develop in 3 days•Larval development occurs in about 40 days•Protandrous except for European (dioecious)
Reproduction in Captivity
Feeding Open WaterEggs feed on yolkJuveniles feed on
Zoobenthos (worms, crustaceans, polycheates
Adults – neckton (finfish & bony fish)
Aquaculture•Larva – only feed on small live food (Enriched Rotifers and artemia)•Adults – pellet feed (55% protein, 10% lipid) •FCR – 1.7:1
Production methods usedCages (new)Lagoon Systems
◦Intensive ◦Semi-intensive
Hatcheries ◦Broodstock◦Spawning
Lagoon SystemsSemi-Intensive
◦Fisherman collect fry from coastal waters May- June◦Transport with oxygenated tanks to special ponds
Extensive◦February - May◦Barriers – reeds,nets, cement◦Nomally polycultured with seabream, mullets, and
eels
Hatcheries Broodstock
◦Breeders of different ages are maintained here◦Parent can be farm raised or wild◦Females 5-8years, Males 2-4 years◦Induce ovulation by hormone treatments◦Fertilization in spawning tanks and incubation in open
waterSpawning
◦Move selected breeders to spawning tanks◦Male:Female – 2:1◦Only Females with oocytes in the late-vitellogenic stage
(diameter larger than 650 micrometers) selected
CagesMade of steel 4-10m²Nets suspended 6-8m
deepSome anchored on land
others in open watersFrequent net changes
(15-20 days)Weekly cleaning to
remove foul organismsDone by divers
Water QualitypH – between 6-8Temperature – 20-
22 degrees Celsius Salinity – 27- 29
g/LDO – 7.5 ppmHigh rates of algae
Economic ImportanceOverfishing is a large
concern and aquaculture of this species has been deemed sustainable
Market price in U.S. $6.99 lb
Annual Production 60,000 tons
Turkey, Croatia, Spain, Italy, Greece
Advantages Disadvantages
Very hardy fishCutting back on
OverfishingEasily marketedCould be inexpensive
if lagoon aquacultured
Long to matureVery competitive
marketLow filet yieldCarnivorousNo synthetic larval
feed