bar

1) a vertical or diagonal patch of pigment usually with well-defined margins (straight sides), often on the flank of a fish; shorter than a band and/or not encircling the body (cf. stripe, an elongate horizontal patch of pigment)

2) a submerged or exposed ridge in rivers, lakes or the ocean deposited where there is a decrease in flow

3) one of the four sides of the mesh of netting

4) an area of shoal water at the entrance to an estuary or harbour

5) an establishment frequented by ichthyologists (wet bars are favoured of course)

6) any net or barrier placed in a river to block or bar fish movements and capture the fish

7) the fins of a fish forming a fringe (Scottish dialect)

8) a strip, including the fins, cut from a halibut (Scottish dialect)