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Nice Surprise


Callan
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What about Cairns and a field trip at the same time.

Totally selfish so I don't have to travel

I would try to make that one where ever it is,sounds like a good idea

 

Bob

 

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  • 2 weeks later...

Have a look at the David Preston's thesis 2009. Southern Cross Uni.

I've looked at this thesis. It doesn't give any info on the sexual characteristics of males and females.

I'm currently looking at Smith's thesis from JCU, but so far, it seems it doesn't give them either.

Edited by fishmosy
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What features on the pleopods would be evident for males or females? Is it similar to freshwater crayfish in that the males and females have different positions for the openings to the sexual organs? 

I've found the answer in Smith and Williams 1982 redescription of the riffle shrimp as 'Atya' striolata (since changed to Australatya).

Quote:

"...the appendages (of the males) were found to differ from those of the female types only in the pleopods which are described below."

"Pleopods 4 and 5. Differ from those of holotype and paratype females in having complete marginal row of setose spines on lateral borders."

"Other than the form of the pleopods, no other sexual differences were detected."

 

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That's true but not the whole story :). The male they looked at was quite large (40mm TL) and was already in the process of becoming a female. The main difference between males and females are in the endopods of the first and second pleopods. Males have an appendix masculina. Compare figs of the female holotype and male. This applies to Caridinas as well. Another less sure way to separate mature males and females is to look at the side of the abdominal segments espec. 2nd segment. In females they are deeper to accommodate the eggs. In Males they are less deep hence their slender appearance. This indicates that the specimen someone asked about the sex in another thread is a female.

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  • 1 year later...

Hey just wanting to know if anyone knows what to feed the baby riffles have three females that are berried up to the max and one that let go of her babies about a week ago but only about 20 have seemed to survive ?Any help would be greatly appreciated cheers.

Edited by ShrimpSilly
Trying to change it to notify me of any replies
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Also I would be very keen to become a member or help start a Shrimp keepers club in Brisbane 

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19 hours ago, ShrimpSilly said:

Hey just wanting to know if anyone knows what to feed the baby riffles have three females that are berried up to the max and one that let go of her babies about a week ago but only about 20 have seemed to survive 1f62a.pngAny help would be greatly appreciated cheers.

Have you tried green water yet? Infusoria? 

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No just ss rotifer and switching the water to brackish over a week I was hoping there would be enough micro organisms in that but they only last a week max have also tried not changing the water to brackish

I shall make some green water cheers 

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in the mean time, you could try mixing a solution of fine powder in water. Just add enough to tint the water in the tank with the larvae green. When the water clears, add more. For powder, you can try spirulina and/or other microalgae, or powdered egg, or yeast. Just be careful not to overfeed. Survival rates on these dry foods arent as good as live food, but some survival is better than none. 

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