True Crabs - Group Overview

True Crabs - Group Overview

Postby MOFIB » Sun Aug 19, 2007 10:19 pm

Brachyuran crabs (True crabs) - Group Overview

1 - Species covered in this forum:

The genus Mithraculus
The genus includes popular species such as:
Mithraculus forceps
Mithraculus sculptus


The genus Percnon
The genus includes popular species such as:
Percnon gibbesi (Sally lightfoot crab)

2 – Common characteristics:
Both genus of crabs are popular in the aquarium trade as they help to control algae growth.

3 – Reproduction:

3.1 – Sex determination:
Separate sexes

3.2 – Sexual organization:
No long term bonds, crabs meet briefly only for mating.

3.3 – Sexing:
Males have a triangle shaped abdomen while females have more rounded abdomens.

3.4 - Pairing / Setting Up Broodstock:
Separate sexes can be placed together without much problems.

3.5 – Courtship:
Usually after the female moults.

3.6 – Spawning:
Incubation period of eggs would depend on temperature.

4 – Eggs:
Clutch size undocumented.

4.1 – Size:
Size of eggs undocumented

4.2 – Quantity:
Undocumented

4.3 – Oil globule present/absent
Unknown

4.4 – Incubation period/Hatching temp:
Between 10-14 days in general.

5 – Larvae:

5.1 – Size at hatching: Unknown
5.2 – Yolk sac present at hatch: Unknown
5.3 – Mouth present at hatch: Yes
5.4 – Eyes developed at hatch: Yes

6 - Rearing:

6.1 - Breeding & Rearing Techniques
Newly hatched Artemia nauplii

6.2 – Day at first feeding:
Day 1.

6.3 – Feeding scheme:
Newly hatched Artemia nauplii

6.4 – Age at meta:
Mithrax crabs around 10 days.
Percnon gibbesi over 3 weeks.

7 – Species been reared successfully
Mithraculus forceps
Mithraculus sculptus


8 – References
Marine Ornamental Shrimp - Biology, Aquaculture and Conservation

8.1 - Articles

9 - Compiled By
FuEl
Dec 03, 2008
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MOFIB
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Joined: Mon Jul 30, 2007 7:49 am

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