Calculate index of total biomass across aggregated subareas
calc_biomass_subarea.Rd
Calculate index of total biomass across aggregated subareas
Arguments
- racebase_tables
data object created from `gapindex::get_data()``
- biomass_strata
a dataframe of stratum biomass, result object from
gapindex::calc_biomass_stratum()
Value
Field | Description |
YEAR | Year the survey was conducted in. |
AREA_ID | Area ID code for each statistical area used to produce production estimates (e.g., biomass, population, age comps, length comps). Each area ID is unique within each survey. |
BIOMASS_MT | The estimated biomass caught in the survey for a species, group, or total for a given survey. |
BIOMASS_VAR | The estimated biomass variance caught in the survey for a species, group, or total for a given survey. |
N_WEIGHT | Total number of hauls with positive catch/weighed taxon data used in calculation. |
N_COUNT | Total number of hauls with positive taxon counts used in calculation. |
N_HAUL | Total number of valid hauls used in calculation. |
N_LENGTH | Total number of hauls with taxon length data used in calculation. |
CPUE_KGKM2_MEAN | The mean of catch weight (kilograms) divided by area (squared kilometers) swept by the net used in design-based indicie calculation. |
CPUE_KGKM2_VAR | The variance of mean of catch weight (kilograms) divided by area (squared kilometers) swept by the net used in design-based indicie calculation. |
CPUE_NOKM2_MEAN | The mean of catch count (number) divided by area (squared kilometers) swept by the net used in design-based indicie calculation. |
CPUE_NOKM2_VAR | The variance of mMean of catch count (number) divided by area (squared kilometers) swept by the net used in design-based indicie calculation. |
POPULATION_COUNT | The estimated population caught in the survey for a species, group, or total for a given survey. |
POPULATION_VAR | The estimated population variance caught in the survey for a species, group, or total for a given survey. |
SPECIES_CODE | The species code of the organism associated with the 'common_name' and 'scientific_name' columns. For a complete species list, review the code books. |
SURVEY | Name and description of survey. The column 'survey' is associated with the 'srvy' and 'survey_id' columns. |
SURVEY_DEFINITION_ID | This number uniquely identifies a survey. Name and description of survey. The column 'survey_id' is associated with the 'srvy' and 'survey' columns. For a complete list of surveys, review the code books. |