Table 1 Covariates for predictive models fitted to focal fleet datasets (2006–2015).

CAS, catch assessment surveys; SFA, Seychelles Fishing Authority vessel database collected in 2017; VMS, vessel monitoring data. Scale indicates the resolution of data collection. CAS covariates were averaged across surveys to give annual estimates.

CovariateDefinitionScaleSourceVessel trait
Fishing strategy
Catch diversitySimpson’s index of catch
diversity
Individual fishing tripCASAbility to target multiple
species buffers catches to
declines in single species
groups (within fishing trips)
Catch compositionBray-Curtis index of catch
dissimilarity
AnnualCASAbility to switch target
species buffers catches to
declines in single species
groups (among fishing trips)
Vessel capacity
LongitudeLongitude of fishing activityAnnualVMSLocation of fishing grounds
LatitudeLatitude of fishing activityAnnualVMSLocation of fishing grounds
Fishing ground areaArea of fishing activity
(square kilometers)
AnnualVMSAbility to explore large and/
or distant fishing grounds
where fish populations may
be less exploited or access
areas of seasonal abundance
(e.g., fish aggregations)
buffers catches to local
declines
Boat sizeLength of boat (meters)SFAInfluences fishing trip
duration, fishing ground
area, capacity to store fish,
size of crew, impact of sea
condition, amount of gear;
enables vessels to target
distant fisheries
Engine powerEngine size (horsepower)SFADetermines time spent
fishing versus traveling to
fishing grounds
FuelFuel consumed (metric tons
and USD)
Individual fishing tripCASFinancial capacity for distant
and/or multiday fishing trips
that may provide larger
catches
Fishing trip durationDays spent at seaIndividual fishing tripCASLonger fishing trips may
enable fishers to reach
distant and less-exploited
fishing grounds, increasing
catch rates