Yellowfish Behaviour

 2018-08-23 03:48 PM by

Yellowfish Behaviour

In a paper by O'Brien et al* (Habitat preferences and movement of adult yellowfishes in the Vaal River, South Africa) a study was made on yellowish movements using transmitters attached to some fish.

Following is a summary of the study of items that will be useful to flyfishers.

Largemouth Labeobarbus kimberleyensis
Movement - Home ranges can be between 1.5 to 12km, with the majority between 4 to 7km, also showing high use areas from 2 to 4km in extent. Movement increases during Spring.
Habitat – Slow flowing pools and glides were more popular in winter, but in warmer periods their use of runs and riffles increased. They avoided fast flowing rapids.
Changes – Water flow or quality changes distrupted the above patterns, with fish moving to refuge areas. It is significant that new home areas were sought after these events.
Atmospheric pressure – High pressure systems in winter led to fish heading for deep water refuges.
Spawning – usually 4-6 weeks later than smallmouth (see below).

Smallmouth L. aeneus
Movement - Home ranges up to 5.5km, with the majority between 0.8 to 2km. Movement increases during Spring.
Habitat – Pools and glides were more popular in winter, glides in spring, and in summer, rapids. Very little rapid use was seen in Spring.
Changes – Water flow increases reduced movement.
Atmospheric pressure – Rapid increase in pressure led to less movement, especially in winter.
Spawning – usually when temperatures reach 18.5C in September/October.

*O'Brien GC, Jacobs F, Cronje L, Wepener V, Smit NJ. Habitat preferences and movement of adult yellowfishes in the Vaal River, South Africa. S Afr J Sci. 2013;109(7/8), Art. #0095, 8 pages. The full paper can be found here: http://dx.doi.org/10.1590/sajs.2013/20120095

You may also find the following interesting: Mulder PFS. Aspects on the ecology of Barbus kimberleyensis and Barbus holubi in the Vaal River. Afr Zool. 1973;8:1–14.