Modes are absolutely huge for your creativity as a bass player. So many people are confused by them, but you needn't be. For an explanation and some tips on how to memorise them, be sure to thoroughly study these lessons:
In this video I play all twenty one modes from the major, melodic minor, and harmonic minor scale over an E drone. It's a fantastic way of practising scales and strengthens your ear at the same time.
Major Scale Modes For Bass
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Mode 1 - Ionian (Major Scale)

Mode 2 - Dorian

Mode 3 - Phrygian

Mode 4 - Lydian

Mode 5 - Mixolydian

Mode 6 - Aeolian

Mode 7 - Locrian

Melodic Minor Modes For Bass
Mode 1 - Melodic Minor

Mode 2 - Dorian b2

Mode 3 - Lydian Augmented

Mode 4 - Lydian Dominant

Mode 5- Mixolydian b6

Mode 6- Locrian Natural 2

Mode 7 - Altered Scale/Diminished Whole Tone/Super Locrian

Harmonic Minor Modes For Bass
Mode 1 - Harmonic Minor

Mode 2 - Locrian #6

Mode 3 - Ionian #5

Mode 4- Dorian #4

Mode 5 - Phrygian Dominant

Mode 6 - Lydian #2

Mode 7 - Altered Dominant bb7/Super Locrian bb7
