sea bass aquaculture
DESCRIPTION
Sea Bass Aquaculture . John Lawson. Species of Sea Bass Grown in Aquaculture . Lutes c alcarifer , Barramundi Dicentrarchus labrax , European Sea Bass Lateolabrax japonicus , Japanese Sea Bass Dicentrarchus punctatus , Spotted Sea Bass Centropristis striata , Black Sea Bass. - PowerPoint PPT PresentationTRANSCRIPT
Sea Bass Aquaculture
John Lawson
Species of Sea Bass Grown in Aquaculture
Lutes calcarifer, BarramundiDicentrarchus labrax, European Sea BassLateolabrax japonicus, Japanese Sea BassDicentrarchus punctatus, Spotted Sea BassCentropristis striata, Black Sea Bass
Lutes calcarifer, Barramundi
Dicentrarchus labrax, European Sea Bass
Lateolabrax japonicus, Japanese Sea Bass
Dicentrarchus punctatus, Spotted Sea Bass
Centropristis striata, Black Sea Bass
Economical ImportanceHigh market value, more expensive than other fish.Grown in countries bordering the Mediterranean Sea,
Western Pacific, Indian Ocean, and along the Atlantic Coast.No more than $10.00 per a pound.Economically important food fish all over the world
depending on where they are grown and which species.Marketable size fish is around 300-600 grams depending on
species. For European Sea Bass annual production is around 60,000-
65,000 tons.
Life Cycle and Larval Stages
Fertilized eggs need 13 to 15 hours in 29 to 31 degrees Celsius seawater in order to hatch.
Larva at 2.05 mm (1 day after hatching). Yolk absorbed.
Larvae at 3.60 mm (10 days after hatching).
Juveniles at 5.5 mm (18 days after hatching).
Life Cycle and Larval Stages 2
Reproduction in Captivity
Production MethodsHatchery
Broodstock/Spawning Tanks – wild caught sea bass or ponds/cages. Used for reproduction of sea bass.
Incubation Tanks – store and help fertilized eggs produce into larvae.
Rearing Tanks – large enough larvae are transferred here for growth until they are large enough to be place in cages or ponds.
Factors Species Production Target Level of Financial Input Salinity most have minimal fluctuation (28-32ppt) Site needs to be near sandy or rocky shore Spacious, flat, minimal water movement
Hatchery
Broodstock/Spawning Tank
Incubation Tank
Larval Rearing Tank
Production Methods 2After larvae have grown to large enough size.Nursery – for juveniles that are 1-2.5cm in length.
Nursery Pond – pond culture specifically for juveniles.Nursery Net/Cage – net or cage specifically for
juveniles.Concrete Tanks – should be avoided.
Grow Out – juveniles reaching 8-10cm to market size. Cages – floating cages and stationary cages.Ponds – monoculture and polyculture.
Intensive
Nursery
Nursery Pond Nursery Cage
Grow OutCages
Stationary Cage Floating Cage
Grow OutPonds
Feeds and FeedingLarvae < 2.05mm – yolk sacLarvae > 2.05mm – zooplankton and
phytoplankton such as diatoms, algae, small shrimp, and small fish. Rotifer and brine shrimp are commonly used as feed.
Juveniles – Chopped up trash fish or brine shrimp.
Adults – Chopped up trash fish.
Feed and Feeding
RotiferBrachionus plicatilis
Brine Shrimp Life Cycle
Artemia
Water Chemistry and Environmental requirements
pH – 7.5 to 8.5Dissolved Oxygen – 4 to 9 ppm Salinity – 10 to 30 pptTemperature – 26 to 32 °C NH3 – less than 1 ppm H2S – less than 0.3 ppmTurbidity – less than 10 ppm
Advantages vs. Disadvantages
Advantages High market value. Economically important food fish around the
world. More expensive than other types of fish. Variety of cultures used for growth. Large production rate. Can live in catadromous habitats.
Disadvantages High levels of management. High operating cost. Land cost to start aquaculture farm is high. High labor and equipment cost. Cannibalism at young age. Breed during Winter and Spring. Inconsistent supply of fry collected from wild. Hard to start culture. Low survival rate for young. Food for larvae hard to manage. Culture cropping period 6 months at 2 cropping per a year.