NEFSC Bottom Trawl Survey Data
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General Notes
- "survdat" package in R for data wrangling (v1.0 used here)
- The Mid Atlantic Bight data has a gap in 2017 due to ship issues leading to low coverage
- I used mean stratified biomass in kg/tow over abundance #/tow - a better measure of energy within the system and takes into account not only changes in numbers of individuals, but the weight of those individuals
- 1969 start of consistent coverage/methods
Literature Citations
Ecological Production Unit (EPU) designation: Lucey & Fogarty 2013
Bottom trawl survey design and methods: Grosslein 1969, Azarovitz 1981, Politis et. al 2014