Final Technical Report part 3 - ACP Fish II

Elaboration of an aquaculture development strategy forst. kitts and nevis – Aquaculture situation appraisalFigure 34: Traditional 60m circumference/19m diameter HDPE cage at a cobia farm in Vietnam. Net changecan be done manually without need of hydraulic crane. If the net is 9 m deep each cage is able to hold upIt has already been mentioned several to 38 tons times of fish regarding the site requirements as forrecommended biotope. The depth is recommended to be between 15 to 30 m (optimal is 25m).The maximum is due the operation such as diving, inspection and detachment/reattachment ofcages to the anchor mooring, while the minimum depth is to have enough water below the netbag, which should be from 5-9m deep (plus the central bottom of the net bag will hang down as acone).The site should be selected e.g. according to the standards developed in Norway – the home ofthe modern cage farming (Figure 35)The Caribbean coast of the islands is protected from the trade winds and thus will fulfill theoptimal wave requirements, while the current is not known to the consultant apart from theCaribbean current is in the range of about 40cm which should be optimal. There is hardly anytidal current. In shallow coastal areas local topography can influence currents a lot and thereforeit cannot be recommended too strongly to make current measurements – like at least for 2 weeksaround a full moon phase with readings at least every hour – speed and direction.Figure 35: Norwegian standards for wave and current selection criteria for traditionalplastic cage farming, green colour shows optimal conditions while red is prohibitiveThis project is financed by the European Union Project implemented by pg. 69RTF pg. 141/204