Alternatively , jacks are presumably resident in their natal rivers their entire lives , reach sexual maturity precociously ( after 2 years ) .
Alternatively , jacks use a sneaking tactic , by darting from nearby refuges to steal fertilisations from hooknose males .
Alternatively , jacks are presumably resident in their natal rivers their entire lives , reach sexual maturity precociously ( after 2 years ) , and use a sneaking tactic , by darting from nearby refuges to steal fertilisations from hooknose males .