Presentation on theme: "Page 1 CONSULTANCY AND RESEARCH IN AQUACULTURE AND THE AQUATIC ENVIRONMENT A Company in the NIVA-group Assessing aquaculture production."— Presentation transcript:
Page 1 CONSULTANCY AND RESEARCH IN AQUACULTURE AND THE AQUATIC ENVIRONMENT A Company in the NIVA-group Assessing aquaculture production
Page 2 Linking production to environmental impact Production survey methods Physical count of structures and GPS marking Interviews on production Cage/pan volume Stocking density, Biomass Feed rate Satellite structure counting Satellite boundary marking Photograph analysis from land Photograph analysis from air
Page 8 Fish Farm registration The coordinates of every fish farm are recorded and note taken if operational
Page 9 Bolinao fish cages Bolinao – Fish CageRangeAverage Date16 April 2005 TypeFish Cage Net Volume150 to 1890 m31155 m3 SpeciesMilkfish, GrouperMilkfish 98% Fry supply12,000 to 80,00042,400 Density0.1 to 30 kg/m315.4 kg/m3 Present Size2 to 400g304g Market size350g to 500g433g Survival85% Culture period6 to 8 months6.8 months Present biomass0.08 to 24 tonnes11.45 tonnes Feed given12.5 to 575 kg/day320 kg/day Feeding rate1.45 to 4.45%/day2.85%/day FCR1.1 to 4:12.8:1
Page 10 Bolinao fish pens Bolinao – Fish PenRangeAverage Date16 April 2005 TypeFish Pen Net12,950 to 16,000 m314,037 m3 SpeciesMilkfish Stocked45,000 to 62,000 fry per pen52,333 per pen Density (fry per m3)3.5 to 3.9 fry per m33,73 fry per m3 Present Size (g)85 to 400245 Density (kg/m3)0.3 to 1.871.04 Market size (g)400 to 500466 Survival95% Culture period4 to 5 months4.17 months Present biomass3,820 to 30,000 kg per pen15,232 kg per pen Feed given280 to 800 kg/day540 kg/day Feeding rate (%/day)2.7 to 7.35 FCR2.61
Page 14 Fish cages In Bolinao, there were 460 fish cages of which 322 were operational (70%) and 138 were not operational (30%) and are stocked with milkfish (98%). There are 13,652,800 fry stocked at 2g size and are grown to a market size of 433 grams in 6.8 months. The cages were stocked with 12,287,520 fish with an average size of 304 grams and have a stocking density of 15.4 kg/m3. The standing stock was 3,735 tonnes of fish. The fish are fed at 2.85% per day using 10,240 kg of feed per day. A production cycle from stocking fry to harvest size is 6.8 months giving 1.76 crops per year per cage. The total production per cycle is 5,025 tonnes and the total production per year from cage culture is 8,844 tonnes.
Page 16 Fish Pens There were 266 fish pens of which 217 were operational and 49 were not operational. There were 10,788,372 fry stocked at 2g size and are grown to a market size of 466 grams in 4.17 months. The pens were stocked with 10,248,953 fish with an average size of 245 grams and have a stocking density of 1.04 kg/m3. The standing stock was 2,511 tonnes of fish The fish are fed at 5% per day using 117.2 tonnes of feed per day. A production cycle from stocking fry to harvest size is 4.17 months giving 2.88 crops per year per pen. The total production per cycle is 5,776 tonnes and the total production per year from pen culture is 13,755 tonnes.
Page 18 Mussel farms There were 254 mussel farms of which 253 are operational and 1 is not operational. The total operational mussel farms have 253,000 poles with a total length of 885,500 meters of pole. The production per cycle from all the mussel farms is 1,645 tonnes. There are 2 cycles per year giving a total production per year from mussel culture if 3,289 tonnes (extractive species).
Page 20 All farms The sea surface area in Bolinao is 28,882,031.86 m2 (not including the islands) ie 2,888 ha. Production is therefore there was fish production of 7.8 tonnes of fish per ha and 1.14 tonnes of mussels.
Page 23 Dagupan fish farm registration Fish Cages Total 124 – 2 not operational Fish Pens Total 553 – 126 not operational Fish Trap Total 528 – 13 not operational Oyster farms Total 94 – 1 not operational
Page 35 Sampalok analysis 43.7 hectares of area 1037 cages 23.7 cages per hectare Range 5 to 25 cages per ha (average 15/ha) 1,170 hectares of cages 4.89% of surface area covered with cages Over 17,500 cages in Taal lake!