Freshwater Crabs - IUCN

Table of Content
Introduction ............................................................................................................................................................. 4
Goal and objectives of the module ....................................................................................................................... 5
Module content .................................................................................................................................................... 6
Training needs ...................................................................................................................................................... 7
Expected results ................................................................................................................................................... 8
Topic 1. Presentation of the study area ................................................................................................................... 9
Topic 2. general information on crabs .................................................................................................................. 11
2.1.- Classification of crabs ................................................................................................................................ 11
2.2.- Origin of crabs ........................................................................................................................................... 11
2.3.- Morphology and anatomy .......................................................................................................................... 12
2.3.1.- General organization of a crab ........................................................................................................... 12
2.3.2.-Circulatory System ............................................................................................................................. 13
2.3.3.- Respiratory System ............................................................................................................................ 14
Topic 3. Eco- biology of crabs .............................................................................................................................. 15
3.1.- biological diversity of crabs in the gambia river basin .............................................................................. 15
3.2.- Reproduction and life cycle ....................................................................................................................... 16
3.3.- feeDing behavior of crabs .......................................................................................................................... 17
Topic 4. Importance of crabs ................................................................................................................................ 19
4.1.- economical importance .............................................................................................................................. 19
4.2.- intermediate host ........................................................................................................................................ 19
4.3.- Toxicity ...................................................................................................................................................... 19
Topic 5. protocol to monitor crabs in the gambia river basin ............................................................................... 20
1. Materials ............................................................................................................................................... 20
5. 1.1.- Scientific team .................................................................................................................................. 20
5.1.2.- Collection material ............................................................................................................................. 20
5.1.3.- Sample periods .................................................................................................................................. 21
5.1.4.- Study site ........................................................................................................................................... 21
5. 2.- Methods ..................................................................................................................................................... 21
5.2.1.- Study and collection methods ............................................................................................................ 21
5.2.2.- Data processing .................................................................................................................................. 22
bibliography .......................................................................................................................................................... 23
ANNEXES ............................................................................................................................................................ 24
Crab module Page 3