Results for “dispersal”

There also exists a sister-group relationship between the Melanotaeniidae and Malagasy family Bedotiidae, which may seem surprising given their respective modern-day distributional patterns. The precise origin and subsequent dispersal of the two families has been the subject of debate, with some palentologists suggesting that Madagascar's freshwater fishes derived froma trans-oceanic dispersal during the Cenozoic Era, but the most compelling arguments currently indicate a freshwater radiation which occurred during the Mezozoic break-up of Gondwana.

This rich feeding ground is exploited until the sea water returns, at which point the catfishes begin to migrate upstream in massive numbers, moving up the Amazon and its tributaries. Sexually mature individuals are not normally recorded during these events so they're thought related to feeding and dispersal rather than spawning. The fish are subject to intensive capture by commercial and artisanal fishing operations during this upstream movement.

Cichlasoma Trimaculatus is a large colourful cichlid, if a little aggressive. It is believed to be one of the fish that was used to create the hybrid Flowerhorn cichlid. We prefer it in its natural state. As with most large cichlids they can be fairly messy eaters so ensure decent filtration is provided. It is recommended to use a spraybar to disperse the water returning to the tank as trimacs will not appreciate strong flow....

This species is not often seen in the hobby, which is a pity as it is a stunning fish with interesting behaviour. If you do manage to get some, be sure to provide the best possible conditions from the start, as they appear to travel quite badly and losses are common. There are currently 3 subspecies, Pseudocrenilabrus philander philander, P. p. dispersus and P. p. luebberti. However, recent studies suggest as many as 11 distinct populations exist, differing in location, colour, patterning, be...