diff --git a/examples/example_chemicaldrift.py b/examples/example_chemicaldrift.py
index 8100e6fd8..a524f394d 100755
--- a/examples/example_chemicaldrift.py
+++ b/examples/example_chemicaldrift.py
@@ -4,7 +4,7 @@
 ========================================================
 """
 
-from opendrift.readers import reader_netCDF_CF_generic, reader_ROMS_native
+from opendrift.readers import reader_netCDF_CF_generic
 from opendrift.models.chemicaldrift import ChemicalDrift
 from opendrift.readers.reader_constant import Reader as ConstantReader
 from datetime import timedelta, datetime
diff --git a/examples/example_radionuclides.py b/examples/example_radionuclides.py
index 10a00af87..2432f679a 100755
--- a/examples/example_radionuclides.py
+++ b/examples/example_radionuclides.py
@@ -4,7 +4,7 @@
 =============
 """
 
-from opendrift.readers import reader_netCDF_CF_generic, reader_ROMS_native
+from opendrift.readers import reader_netCDF_CF_generic
 from opendrift.models.radionuclides import RadionuclideDrift
 from datetime import timedelta, datetime
 import numpy as np
diff --git a/opendrift/readers/basereader/variables.py b/opendrift/readers/basereader/variables.py
index 8d8795536..cd9fb8d91 100644
--- a/opendrift/readers/basereader/variables.py
+++ b/opendrift/readers/basereader/variables.py
@@ -743,7 +743,7 @@ def get_variables_interpolated_xy(self,
             z = z.copy() * np.ones(x.shape)
         z = z.copy()[ind_covered]
 
-        logger.debug('Fetching variables from ' + self.name)
+        logger.debug(f'Fetching variables from {self.name} covering {len(ind_covered)} elements')
         self.timer_start('reading')
 
         # Filter derived variables