Cobia presentation

Report
Sarah Betbeze
7/10/13
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Rachycentron canadum
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Family Rachycentridae
courtesy NOAA
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Top producing countries: China and Taiwan Province
of China (P.C.)
Taiwan P.C.
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Production costs = ~$2.20/kg in 2001
Market value is based on size
 7.7 kg (17 lbs.) or more $5.50/kg in 2004 for whole fish
Taiwan keeps 8-10 kg cobia and sells them whole.
6-8 kg cobia are sent to Japan.
Fillets usually sent to other countries
Other countries where cobia aquaculture occurs:

Bahamas, Belize, the Dominican Republic, Mexico, Philippines, Puerto
Rico, USA, and Vietnam
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Egg

larva
juvenile
adult
Spawning season in G.O.M. = April through
September
 Every 9-12 days, 15-20 times
 Dispense eggs and sperm into the water; fertilization occurs
 Larvae hatch ~24-36 hours following fertilization
 Day 30 – Juvenile already has markings and coloration of adult
cobia
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Age during first spawning season
 Males ---- about 1-2 yrs old
 Females ---- about 2-3 yrs old
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Broodstock caught in wild during normal spawning
season
Spawning
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Can be stimulated in 2 ways:
 Hormones
 Controlling photoperiod and water temperature
www.fao.org
www.lib.noaa.gov
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Hatcheries, nurseries, and grow-out cages employed
Larvae raised in “greenwater” nursery ponds
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Days 20-45
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Moved to bigger ponds; reach 30g
Days 75-150/180
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Introduced to buoyant, pelleted food; reach 2-5g
Days 45-75

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Until day 20
Moved to even bigger ponds or near-shore cages where they
reach 1.3-2.2 lbs.
Moved to grow-out cages

www.fao.org
13-22 lbs.
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Favorite dish: swimming crabs
Opportunistic carnivores
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Fish, crab, shrimp, squid
Taiwan P.C.
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Feed cobia sinking and buoyant pellets
6 days a week
Blue crab --- naturelssi.com
Squid ---- dpi.nsw.gov.au
Shrimp ----- fishwatch.gov
Cobia ---- seasquaredcharters.com
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Dissolved Oxygen

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pH

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At least 5ppm (mg/L)
When spawning ----- ~7.8
Water temperature

>79 degrees Fahrenheit (26 degrees Celsius)
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Pros
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Quick growth rate
Good FCR
Fantastic flesh quality
Limited wild population
Can handle a large variety of salinities
Cons
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Difficult to obtain trash fish to feed them
Pond cultures have potential to cause water quality problems & excess
nutrient loading in the outflowing water
Prone to diseases
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Bester, Cathleen. "FLMNH Ichthyology Department: Cobia." FLMNH Ichthyology
Department: Cobia. Florida Museum of Natural History, n.d. Web. 01 July 2013.
<http://www.flmnh.ufl.edu/fish/Gallery/Descript/cobia/cobia.html>.
Kaiser, Jeffrey B., and Joan Holt. "Species Profile: Cobia." Southern Regional
Aquaculture Center, Aug. 2005. Web. June 2013.
<https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/180/
>.
Perschbacher, Peter, Dr. "Rachycentridae." Rachycentridae. Aquaculture/Fisheries
Center, University of Arkansas at Pine Bluff, n.d. Web. 06 July 2013.
<http://www.uaex.edu/pperschbacher/Fish/Cobia.htm>.
"Rachycentron Canadum." FAO Fisheries & Aquaculture Department. Food and
Agriculture Organization of the United Nations, 2013. Web. June 2013.
<http://www.fao.org/fishery/culturedspecies/Rachycentron_canadum/en>.

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