SELECT ISNULL(SUM(Stocking_Count),0)
FROM Fish_Stocking
where fish_id = 'B2017-1' and tank_id = 'H A01' and
      Date_Assigned = '2017-02-02' and stocking_date <= '2017-03-28'

SELECT ISNULL(SUM(NO_FISH_SWUM_OFF),0)
FROM Swim_Thru
where Dest_fish_id = 'B2017-1' and Dest_tank_id = 'H A01' and
      Dest_Date_Assigned = '2017-02-02' and date_swim_thru <= '2017-03-28'