1)  Potential prey increases with photoperiod (and temperature) during the period of larval drift (February to May).

2)  Larval growth is related to potential-prey abundance.
3)  Smaller, younger larvae have lower maximum growth rates and require higher prey levels to achieve maximum growth rates.
4)  The year 1995 was a period of low prey abundance and poor growth of cod and haddock larvae.
6)  Further resolution of the roles of prey abundance, photoperiod and water temperature in determining larval growth rates will require studies across systems with different schedules of change in these variables.