What is a fishing sinker

A sinker is weight added to a rig so that it gets where it needs to be and stays there. «Sinks it» is imprecise: a sinker sets the rate of descent, not the bare fact that the rig will reach the bottom.

Rate matters more than mass

A light bait on a light sinker falls slowly and spends a long time in the water column — fishing for anything that is not sitting on the deck is built on that. A heavy sinker goes through the column fast and barely works on the way.

So «what sinker should I use» really means something else: how long the bait should spend in the water on its way down.

Sliding or fixed

That is the main division. On a sliding weight the line runs through it and the fish pulls line while the weight stays. On a fixed one the weight is anchored and the fish meets it at once.

The first gives a soft, resistance-free bite; the second gives self-hooking. Both rigs work, and choosing between them is choosing whether the fish should feel the weight in the first moment.

Shape is about the bottom, not the mass

Two pieces of equal weight behave differently: a streamlined one rolls and passes stone, a flat one holds in current and snags. Grips and ribs hold better still — and snag more readily still.

Material sets the volume

At the same weight a denser metal makes a smaller piece. A smaller piece snags less often and shows less, and on a stony bottom that decides more than a gram of mass. Materials are covered separately under lead and its alternatives.

When the weight sits on the hook itself

Some pieces have sinker and hook in one: a jig head, a weighted hook. Strictly that is no longer a sinker but part of the lure, and we cover it elsewhere; the mechanics of weight there are the same.

Where it sits in the rig

The weight can sit on the main line, on a separate dropper to one side, or between the main line and the hooklength. Position changes behaviour as much as type: the same sinker on a dropper and on the main line gives a different bite.

What we do not state here

How many grams to use for a given depth and flow. That depends on the tackle, the bottom and the strength of the current all at once, and we found no verified source for a general table. The sign that needs no number: the rig is being swept — go heavier; the bait drops like a stone — go lighter.