Publikationsdatum:
2021-05-19
Beschreibung:
WIOMSA/MARG-I/2003/06
Beschreibung:
Experimental culture of crabs, fish and prawns was conducted in a pond measuring
approximately 800 m2 in Kwetu training center, Mtwapa, Kenya. The objective was to
evaluate the success, potential and economic viability of the culture system. Crabs were
placed in 6 experimental cages measuring 2 x 2x 0.5m for 3 months in different stocking
densities in order to compare their survival. The three densities were 3.0, 6.0 and 9.0
crabs/m2. Other crabs were placed in compartments made of locally available ‘fito’
designed in eight compartments measuring 1x1 x 0.9 ft for crab fattening.
In the same pond, 2045 juvenile prawns Penaeus monodon and P. indicus measuring
between 21-25 mm in total length were stocked inside the pond to grow, together with
milkfish and mullets. At the end of 3 months, harvesting was done for crabs, and after 6
months for prawns and fish.
Environmental variables were measured in the pond biweekly during the six month
period. This included, temperature, salinity, chlorophyll a, nitrates, phosphates and pH.
Higher survival of crabs occurred in the cages that had a stocking density of 3.0 crabs/m2.
For crab fattening, highest mean growth per month was 24.6 gm, while lowest was 6.7
gm. A mortality of 43% was experienced during crab fattening at the end of the culture
period. Recapture of prawns was poor due to inability to drain the pond completely, and
mortality, however a number of fish by catch are reported. Constraints and
recommendations are discussed.
Beschreibung:
WESTERN INDIAN OCEAN MARINE SCIENCE ASSOCIATION
Beschreibung:
Published
Schlagwort(e):
Mtwapa, Kenya
;
Aquaculture techniques
;
Aquaculture development
;
Aquaculture techniques
;
Crab fisheries
Repository-Name:
AquaDocs
Materialart:
Report
,
Non-Refereed
Format:
622358 bytes
Format:
application/pdf
Format:
27
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