info@fishforever.org.nz | 027 243 1777

What does Fish Forever do?

We promote and support marine protection initiatives within, near and beyond New Zealand's Bay of Islands.
We meet the last Thursday of every month in Paihia and welcome new members.
Please get in touch This email address is being protected from spambots. You need JavaScript enabled to view it. | 027 243-1777

Put the big ones back

Big snapper and big crays eat kina. Smaller snapper and crays can't.
By keeping kina numbers in check, they help keep our rocky reefs healthy.

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Put the big ones back

 

barrenKina Barren Photo: Vince Kerr
Taking big snapper and big crayfish out of an area lets kina run rampant. Ever seen a kina barren?

Putting the big snapper and big crayfish back is one thing we can do to keep our shallow reefs healthy.

  • kina kelpKina munching kelp. Photo: Vince KerrBig snapper and big crayfish deal to kina, keeping their population in check. Smaller snapper and crays can't do that job.
  • When these big predators are removed from an area, kina numbers explode.
  • Kina eat kelp.
  • Left unchecked, kina munch through kelp forests, sometimes as deep as 8 m, leaving bare rock - kina barrens
  • Kelp forests are the nurseries of the sea.  When they are gone vital habitat for food, for cover and breeding is lost.

In a habitat survey around Waewaetorea and Okahu Islands in the Bay of Islands, it was found 65% of the sheltered reefs were kina barrens

 

 

Why big snapper and crayfish are the best breeders

Big snapper and big crayfish are the best breeders. Their egg production increases exponentially with greater size.

That equates to the best chance for the maximum number of juveniles to bolster the snapper population – if everything else is hunky dory. (Typically in snapper, good numbers of new juveniles correspond to warm years.)

By definition a large snapper is also a “good snapper” – it is a skilled predator and both smart and fast enough to have avoided our fishing lines over the years. It follows that these good snapper are the key breeders passing on the best genes to the population.

This brings us down to the principle of natural selection, the way that species prosper and evolve in a changing world. Fishing selects for slow-growing, early maturing individual snapper. This unnatural - or artificial - selection may not be in the best interest of the species. By fishing out the bigger snapper we may be compromising evolutionary development within the population. We may be losing the good genes.



roger-grace"We had no reason to believe that Kina Barrens, widespread throughout Northern NZ were anything but a natural occurence. We now know they are an artifact of overfishing. Kina Barrens have all but disappeared at Goat Island and Tawharanui Marine Reserves... "
Dr Roger Grace - Marine Scientist


 

 

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Join Fish Forever

nudi spongeAll of us with an interest and love of Tangaroa, let's work together and take on the challenge of marine protection for the Bay.

Annual Membership Rates:
Student/concession - $15.00
Affiliate (please name organistation) - $15.00
Individual - $25.00
Family - $35.00

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