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Are red rambo crab numbers increasing?
yes 95%  95%  [ 21 ]
no 5%  5%  [ 1 ]
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Post Posted: Thu Jun 29, 2017 2:26 pm    Post subject: Are red rambo crab numbers increasing?

Territory fishos have said red rambo crab numbers are increasing. Do you agree?


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Post Posted: Thu Jun 29, 2017 3:03 pm    Post subject: Re: Are red rambo crab numbers increasing?

Yep. Out of 12 crabs 7 were Rambos from middle arm the other week


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Post Posted: Thu Jun 29, 2017 4:07 pm    Post subject: Re: Are red rambo crab numbers increasing?

3 out of 6 at shoal bay 2 weeks back.


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Post Posted: Fri Jun 30, 2017 10:50 am    Post subject: Re: Are red rambo crab numbers increasing?

This just emailed in by a mate ...

"Over the past three years I've noticed I'm getting more and more WA brown mud crabs (aka red rambos) in my pots in Shoal Bay. On Wednesday out of my five pots I got four crabs, 1 bluey (now called green by Fisheries) and three browns. But the frustrating thing was that even though the male browns had far bigger claws than the big female bluey they were about 1-2mm under size using the bluey measurement.

"But I see on my Strike Zone measuring device that the WA crab is stated as legal at 1200mm ... that made my three crabs legal ... hhhhhmmm!!!!!
So I rang Fisheries regarding the issue. Can you believe I'm told that even though Fisheries are well aware that the WA crab has migrated (or increased in numbers) into Darwin waters recently, is a smaller crab and are contemplating the ramifications, I am the first person to raise this issue. The fact I've done that means it has to be addressed because there are legal implications as well. They admit the browns have arrived very quickly, I first noticed one in my pots only three years ago.

"But already there is an problematic implication ... the greens are mating with the browns and are producing a hybrid ... oh dear."

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Post Posted: Fri Jun 30, 2017 11:13 am    Post subject: Re: Are red rambo crab numbers increasing?

I caught one bluey at 15 cm, and about 7 rambos yesty at Dundee land based and all except 2 of the rambos were 12cm and obviously went back. And yes agreed numbers are on the up...Also all the rambos had bigger claws than the 15cm bluey haha

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Post Posted: Thu Aug 10, 2017 9:13 am    Post subject: Re: Are red rambo crab numbers increasing?

The rambos seem to be more aggressive, and also seem more relatively mature when they have a smaller carapace size.
Maybe throwing them back at 12cm is part of the reason for their population boom?
Also, I have never caught a female red Rambo looking crab. What do the females look like?


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Post Posted: Thu Aug 10, 2017 10:12 am    Post subject: Re: Are red rambo crab numbers increasing?

Excellent point PMS, it might be growing fishing pressure that is benefiting the rambos via size limits.

The rambos are supposed to tolerate fresh better than the green crab, given the four dry years you would think serrata would have benefited.

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