Pier fishing and grappling hooks

[Aquaneko]

Does anyone know where to buy a folding grappling hook in Toronto? If so how much and approx. how much weight can the hook hold?

My main use will be on piers where as a backpacker I don't want to bring a large fishing net. Key example would be at Center Island at the large pier. I have seen videos on youtube of people fishing on piers and using a grappling hook to lift thier catch up. It was amazing.

My other use is for when climbing wave breakers (ie. Jacksons Point wave breakers) when walking the slippery algae rocks I would like to throw a grappling hook up into the rocks to give me some support guide line as I climb the rocks. Also to help others around me climbing the breakers.

Here is a youtube video some gals catching some big fish.

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Hmm.. I wonder if you did catch and release on the large pier at Center Island can you just drop the fish back into the water without harming it? I figure that pier would be in deeper waters or extended out already quite a ways.