Fish - Practical part
13 important questions on Fish - Practical part
When is an african cat fish mature?
- Male = 35 cm
- Female = 200-250 g at 2 years old
When is the nile tilapia fish mature?
- 18-20 cm long
- nuil
What are te two ways in which the length of a fish is determined?
- Standard length = tip of snout till start of tail
- Total length = tip of the snout till the end of the tail
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Why standard length instead of total length?
- Caudal fin varies a lot per fish
- Caudal fin damages easily
How do you recognise the male genitalia from a african cat fish?
How do you recognise female genitallia from a african catfish?
What are otherways to recognise sex in a african cat fish?
- Belly size = large is female, small is male
What are the special features of the african catfish?
- Lateral line organ, fish can sense waterflow and temperature change.
- Gills, african catfish is an airbreather, there are 5 gill arches.
What four external factors is the ripening cycle related to?
- Temperature
- Photoperiod
- Rainfall
- Waterfall
In what moment of the year is the afr. Catfish reproducing?
What happens to the GSI when reproduction of the african catfish takes place?
How do you take an egg sample from the afr. Catfish?
- Put the tube into the genital pore an enter the ovaries, these are hollow
- Suck on the tube to get the oocytes out.
Where is the anal opening and the genital pore on the afr. Catfish?
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