Council Regulation (EU) 2016/72 of 22 January 2016 fixing for 2016 the fishing opportunities for certain fish stocks and groups of fish stocks, applicable in Union waters and, for Union fishing vessels, in certain non-Union waters, and amending Regulation (EU) 2015/104
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| a Individual haul when using a conventional trawl, or integrated over a six-hour period when using the continuous fishing system. | |||||
| b Individual haul when using a conventional trawl, or a two-hour period when using the continuous fishing system. | |||||
| Method | Equation (kg) | Parameter | |||
|---|---|---|---|---|---|
| Description | Type | Estimation method | Unit | ||
| Holding tank volume | W * L * H * ρ * 1 000 | W = tank width | Constant | Measure at the start of fishing | m |
| L = tank length | Constant | Measure at the start of fishing | m | ||
| ρ = volume-to-mass conversion factor | Variable | Volume-to-mass conversion | kg/litre | ||
| H = depth of krill in tank | Haul-specific | Direct observation | m | ||
| Flow metera | V * Fkrill * ρ | V = volume of krill and water combined | Haula specific | Direct observation | litre |
| Fkrill = fraction of krill in the sample | Haula specific | Flow meter volume correction | — | ||
| ρ = volume-to-mass conversion factor | Variable | Volume-to-mass conversion | kg/litre | ||
| Flow meterb | (V * ρ) – M | V = volume of krill paste | Haula specific | Direct observation | litre |
| M = amount of water added to the process, converted to mass | Haula specific | Direct observation | kg | ||
| ρ = density of krill paste | Variable | Direct observation | kg/litre | ||
| Flow scale | M * (1 – F) | M = mass of krill and water combined | Haulb specific | Direct observation | kg |
| F = fraction of water in the sample | Variable | Flow scale mass correction | — | ||
| Plate tray | (M–Mtray) * N | Mtray = mass of empty tray | Constant | Direct observation prior to fishing | kg |
| M = mean mass of krill and tray combined | Variable | Direct observation, prior to freezing with water drained | kg | ||
| N = number of trays | Haul specific | Direct observation | — | ||
| Meal conversion | Mmeal * MCF | Mmeal = mass of meal produced | Haul specific | Direct observation | kg |
| MCF = meal conversion factor | Variable | Meal to whole krill conversion | — | ||
| Codend volume | W * H * L * ρ * π/4 * 1 000 | W = codend width | Constant | Measure at the start of fishing | m |
| H = codend height | Constant | Measure at the start of fishing | m | ||
| ρ = volume-to-mass conversion factor | Variable | Volume-to-mass conversion | kg/litre | ||
| L = codend length | Haul specific | Direct observation | m | ||
| Other | Please specify | ||||
| a A new period will commence when the vessel moves to a new subarea or division. | |
| b Individual haul when using a conventional trawl, or integrated over a six-hour period when using the continuous fishing system. | |
| Holding tank volume | |
|---|---|
| At the start of fishing | Measure the width and length of the holding tank (if the tank is not rectangular in shape, then additional measurements may be required; precision ±0,05 m) |
| Every montha | Estimate the volume-to-mass conversion derived from the drained mass of krill in a known volume (e.g. 10 litres) taken from the holding tank |
| Every haul | Measure the depth of krill in the tank (if krill are held in the tank between hauls, then measure the difference in depth; precision ±0,1 m) |
| Estimate the green weight of krill caught (using equation) | |
| Flow metera | |
| Prior to fishing | Ensure that the flow meter is measuring whole krill (i.e. prior to processing) |
| More than once per montha | Estimate the volume-to-mass conversion (ρ) derived from the drained mass of krill in a known volume (e.g. 10 litres) taken from the flow meter |
| Every haulb | Obtain a sample from the flow meter and: |
| measure the volume (e.g. 10 litres) of krill and water combined | |
| estimate the flow meter volume correction derived from the drained volume of krill | |
| Estimate the green weight of krill caught (using equation) | |
| Flow meterb | |
| Prior to fishing | Ensure that both flow meters (one for the krill product and one for the water added) are calibrated (i.e. show the same, correct reading) |
| Every weeka | Estimate the density (ρ) of the krill product (ground krill paste) by measuring the mass of a known volume of krill product (e.g. 10 litres) taken from the corresponding flow meter |
| Every haulb | Read both flow meters, and calculate the total volumes of the krill product (ground krill paste) and that of the water added; density of the water is assumed to be 1 kg/litre |
| Estimate the green weight of krill caught (using equation) | |
| Flow scale | |
| Prior to fishing | Ensure that the flow scale is measuring whole krill (i.e. prior to processing) |
| Every haulb | Obtain a sample from the flow scale and: |
| measure the mass of krill and water combined | |
| estimate the flow scale mass correction derived from the drained mass of krill | |
| Estimate the green weight of krill caught (using equation) | |
| Plate tray | |
| Prior to fishing | Measure the mass of the tray (if trays vary in design, then measure the mass of each type; precision ±0,1 kg) |
| Every haul | Measure the mass of krill and tray combined (precision ±0,1 kg) |
| Count the number of trays used (if trays vary in design, then count the number of trays of each type) | |
| Estimate the green weight of krill caught (using equation) | |
| Meal conversion | |
| Every montha | Estimate the meal to whole krill conversion by processing 1 000 to 5 000 kg (drained mass) of whole krill |
| Every haul | Measure the mass of meal produced |
| Estimate the green weight of krill caught (using equation) | |
| Codend volume | |
| At the start of fishing | Measure the width and height of the codend (precision ±0,1 m) |
| Every montha | Estimate the volume-to-mass conversion derived from the drained mass of krill in a known volume (e.g. 10 litres) taken from the codend |
| Every haul | Measure the length of codend containing krill (precision ±0,1 m) |
| Estimate the green weight of krill caught (using equation) | |
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