Hey Juan and Nick
Juan - Circle hooks have most relevance in controlling hooking location (i.e. Jaw vs Gut) rather than reducing by-catch. A higher level of post release survivorship would be expected for target species and by-catch using circle hooks as they generally hook in the jaw rather than the gut. I work with a variety of shark species in the Bahamas and use 16/0 mustad circle hooks and 88.2% of the time our sharks are hooked cleanly in the jaw.
Nick - I belive catch rates are generally lower for circle hooks than J hooks however there has been some research carried out in NZ that suggests that snelling the circle hooks so they are held offset to the line can increase catch rates without increasing the instances of gut hooking. I plan on switching to snelled circle hooks as soon as this year of sampling is over.
> Date: Mon, 8 Dec 2008 11:02:38 +0000
> From: [log in to unmask]
> Subject: Re: circle hooks
> To: [log in to unmask]
> Hi Juan,
> My experience with circle hooks is that they are a lot harder to get "hooked". I work with sharks and we tried using circle hooks to begin with for catching our fish to tag. As it turned out we lost a high number of fish as they didn't get hooked. We eventually switched to large "J" hooks with the harb filed down and that worked much better. However, you have a much greater chance of hooking the animal in the stomach which is less desirable if you intend to keep your animal alive. I am afraid I cannot give you any references to back this up.
> I hope this is of some help,
> Department of Zoology,
> Aberdeen University,
> Tillydrone Avenue,
> Aberdeen, AB24 2TZ.
> Tel: +44-(0)-1224-27-44-88
> Email:[log in to unmask]
> -----Original Message-----
> From: Scientific forum on fish and fisheries [mailto:[log in to unmask]] On Behalf Of Juan Pedro Monteagudo
> Sent: 08 December 2008 06:48
> To: [log in to unmask]
> Subject: circle hooks
> Hi everyone, im looking for some literature on implementation of circle hooks and estimates on mitigation of bycatch, as it seems they might not be such a good alternative or even being worst at the end.
> Thanks in advance.
> JP Monteagudo
> Juan Pedro Monteagudo González
> Asesoria Técnica en Pesquerías y Ciencias del Mar Fisheries and Marine Sciences Consultant [log in to unmask] [log in to unmask]
> +(34) 647844645
> The University of Aberdeen is a charity registered in Scotland, No SC013683.
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