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Economic Potential of Sea Ranching and Enhancement of Selected Shellfish Species in Canada
Table 1: Culture-Based Fisheries Production - Assumptions and Results
| Parameter | Pacific Culture Fisheries | Atlantic Culture Fisheries | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Geoduck Clam (1) |
Manila Clam (1) |
Northern Abalone (1) |
Japanese Scallop |
Sea Scallop (2) |
Soft Shell Clam (1) |
Green Urchin |
American Oyster |
Northern Quahaug |
|
| Total estimated habitat area (ha) | 20,600 | 8,000 | 11,000 | 10,000 | 6,830,000 | 310,000 | 780,000 | 6,200 | n.a. |
| Total culture area (ha) | 3,000 | 3,000 | 2,500 | 3,000 | 250,000 | 7,500 | 5,000 | 3,000 | 2,000 |
| Grow out cycle (years) | 6 | 3 | 5 | 3 | 5 | 3 | 5 | 5 | 6 |
| Area seeded annually (ha/year) | 500 | 1,000 | 500 | 1,000 | 50,000 | 2,500 | 1,000 | 600 | 333 |
| Planting density (# seeds/square metre) | 20 | 375 | 40 | 8 | 10 | 350 | 300 | 30 | 300 |
| Annual seed requirements (millions) | 100 | 3,750 | 200 | 80 | 5,000 | 8,750 | 3,000 | 180 | 1,000 |
| Survival (% to adult) | 0.30 | 0.60 | 0.30 | 0.20 | 0.20 | 0.65 | 0.10 | 0.40 | 0.40 |
| Final density (adults/square metre) | 6.00 | 225.00 | 12.00 | 1.60 | 2.00 | 227.50 | 30.00 | 12.00 | 120.00 |
| Potential harvest (millions/year) | 30 | 2,250 | 60 | 16 | 1,000 | 5,688 | 300 | 72 | 400 |
| Harvest efficiency (%) | 0.85 | 0.95 | 0.95 | 0.85 | 0.85 | 0.75 | 0.80 | 0.90 | 0.85 |
| Seed price ($/seed) | 0.1400 | 0.0090 | 0.1000 | 0.0150 | 0.0150 | 0.0050 | 0.0300 | 0.0300 | 0.0150 |
| Nursery price ($/seed) | 0.4000 | n.a. | 0.1000 | n.a. | 0.0100 | 0.0150 | n.a. | n.a. | n.a. |
| Seeding cost ($/ha) | $25,000 | $10,000 | $120,000 | $20 | $20 | $10,000 | $20 | $25 | $25 |
| Total annual seeding cost (millions of $) | $12.500 | $43.750 | $100.000 | $1.220 | $101.000 | $25.000 | $90,020 | $5.415 | $15.008 |
| Average adult weight (kg) | 0.685 | 0.018 | 0.095 | 0.125 | 0.016 | 0.010 | 0.100 | 0.095 | 0.020 |
| Market size (min) | (3) | 38 mm | 75 mm | (3) | 10 g | 38 mm | 60 mm | 76 mm | 50 mm |
| Total harvest weight (millions kg) | 17.5 | 38.5 | 5.4 | 1.7 | 13.6 | 42.7 | 24.0 | 12.2 | 6.8 |
| CPUE (kg/day) | 900 | 800 | 200 | 300 | 400 | 300 | 1,500 | 250 | 1,500 |
| Effort (vessel-days) | n.a. | n.a. | n.a. | 5,667 | 34,000 | n.a. | n.a. | 0 | 0 |
| Effort (diver or digger-days) | 19,408 | 48,094 | 27,075 | n.a. | n.a. | 142,188 | 16,000 | 48,600 | 4,533 |
| Landed price ($/kg) | $20.00 | $5.00 | $40.00 | $6.50 | $13.00 | $2.75 | $5.50 | $3.50 | $2.50 |
| Total revenue (millions of $) | $349.350 | $192.375 | $216.600 | $11.050 | $176.800 | $117.304 | $132.000 | $42.525 | $17.000 |
| 1. Seeding cost reflects predator control in the form of protective netting. 2. Average weight and total harvest are for meats only. 3. No minimum legal size |
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