NE Groundfish fleet - Effort & Landings
groundfishLandEffort.RmdSpecies
The NE multispecies (Groundfish) FMP comprises the following species:
- Atlantic Cod (COD)
- Haddock (HAD)
- Yellowtail Flounder (YTF)
- Pollock (POL)
- American Plaice (PLA)
- Witch Flounder (WTF)
- White Hake (WHK)
- Winter Flounder (WIF)
- Redfish (RED)
- Atlantic Halibut (HAL)
Non target species
- Windowpane flounder (WPF)
- Ocean Pout (OPT)
- Atlantic Wolffish (WOL)
These GEARCAT(s) associated with groundfish species are:
- Bottom Trawl
- Sink Gillnet
** Still need to separate some species (sharks) **
Effort by port
The effort variable is Days at sea (DAS) and is a crude metric. Only integer values and rounded up to the nearest whole day. It is the length of the trip.
After aggregating the top ports based on the decisions found in this section {#sel} and combining all remaining ports into an “other fleet” we can look at the total effort by fleet in units: days at sea
Effort by Port by box
Partition effort by box.
Note: In atlantis effort is entered as as daily effort (days of effort per day). This equates to dividing the annual effort by 365 days.
Landings by species compare
Compare landings used to force model with landings obtained from CAMS for groundfish fleets.
Note: OPT - ocean pout, WOL - wolfish, WPF - windowpane flounder are not target species.
Landings in Atlantis are expressed as milligrams of Nitrogen \(mgNs^{-1}\). Landings data are in metric Tons of wet weight \(mTyr^{-1}\). To convert between the two:
\[ \begin{aligned} \text{1 } mgNs^{-1} &= 60*60*24\text{ }mgNday^{-1} \\ &= 365*60*60*24 \text{ }mgN yr^{-1} \\ &= 31536000 * 20 * 5.7 \text{ }mg yr^{-1} \text{(wetweight)} \\ &= 31536000 *20 * 5.7 * 10^{-9}\text{ }MT{yr}^{-1} \\ &= 3.595104 \text{ }MTyr^{-1} \end{aligned} \]
where wetweight:C = 20 and C:N = 5.7 (These are set as parameter
values in biology.prm as k_wetdry and X_CN
respectively)
