The dec came up with many excuses as to the smelt demise but last year as i suspected right along they agreed the treatment for lamphry,s ......MAY have had a impact on the smelt smolts treatment for the lamps started in middle to late 80,s the same time the smelt pop took a major downturn... but for years i was given excuses from phospate detergents ban in 86 to booming lake trout reproduction ate all the smelt .. the zebras do eat the photoplankton which the fresh water shrimp thrived on ,and they were popular forage for the smelt but ,,,,im pretty shure the poisen used for the lamphrys was the major factor