Black flesh on cray tails

 This must have been discussed before but unable to find when searching.

What causes parts of the crayfish flesh to go black / grey around the tail when seperated after boiling and what is the solution to prevent it?

I seem to recall vinegar added to the water when boiling?

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Tom M


little johnny's picture

Posts: 5355

Date Joined: 04/12/11

I've found dropping them

Fri, 2017-12-01 19:56

In ice slurry best( black doesn't happen). Rather than drowning them. They go to sleep real quick. Possible blood ( black) when cooked I hang them upside down ( open tail on sink) all the crap stays in head and sets there. I do same with crabs turn them upside down. Get a heap dryer and cleaner crab and cray. Unsure have a crack. I also add 1 big spoon of sugar when I cook any crustation

Tom M's picture

Posts: 661

Date Joined: 22/09/15

 Thanks LJ they are put into

Sat, 2017-12-02 07:55

 Thanks LJ they are put into ice slurry on the boat, will try the sugar and see what happens,

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Tom M

ranmar850's picture

Posts: 2702

Date Joined: 12/08/12

Can mean they have not been cooked long enough

Sun, 2017-12-03 10:40

 It really is only cosmetic--the export cooked crays from the factory, IIRC, had to be boiled for 20 minutes to avoid this, obviously undesirable for a commercial product. Personally, I'd rather cook them for the period of time which gives the best taste/texture, and just remove any small discoloured bits.  leaving frsh water slurry to chill them down for too long doesn't do them any favours--just enough to stun them before cooking is best.  If you have a fair bit of transport time from when you catch to when you get home, keep them cool/cold but not immersed in fresh water for too long. 

Tom M's picture

Posts: 661

Date Joined: 22/09/15

 Thanks makes sense 

Sun, 2017-12-03 12:29

 Thanks makes sense 

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Tom M