Report the first and last date where an item is listed

I have a spreadsheet which is used for tracking work items for a team of people.
On one sheet I have a column of dates and rows of named 'tasks' against them.
I need to identify the first and last dates at which a 'task' is listed.

My spreadsheet is attached.

On sheet2 K2 I want to see the first / earliest date where 'Fish' occurs on sheet1
On sheet2 L2 I want to see the last / latest date where 'Fish' occurs on sheet1

Please help! I have tried using SUMPRODUCT MAX / MIN but I got myself in a muddle!!