Inside ROMS/Nonlinear/Biology/fennel_mod.h, the 15 biological tracers (here I'm assuming that the user has activated RIVER_DON,PO4,CARBON,OXYGEN) are attributed the following identification index:
1-NO3,2-NH4,3-chlorophyll,4-phytoplankton,5-zooplankton,6-LdetritusN,7-SdetritusN,8-RdetritusN,9-PO4,10-LdetritusC,11-SdetritusC,12-TIC,13-alkalinity,14-RdetritusC,15-oxygen.
Inside ROMS/External/bio_Fennel.in, the advection schemes and the boundary conditions are listed in this order:
1-NO3,2-NH4,3-chlorophyll,4-phytoplankton,5-zooplankton,6-LdetritusN,7-SdetritusN,8-LdetritusC,9-SdetritusC,10-TIC,11-alkalinity,12-oxygen,13-PO4,14-RdetritusN,15-RdetritusC.
A user relying on the list inside bio_Fennel.in would misattribute the advection scheme and boundary condition for biological tracers 9-15.
Pierre