Behavioral similarity between partners is likely to promote within-pair compatibility and to result in better reproductive success. Therefore, individuals are expected to choose a partner that is alike in behavioral type. However, mate searching is very costly and does not guarantee finding a matching partner. If mismatched individuals pair, they may benefit from increasing their similarity aft...

The entry of alien predatory fish in Indonesian waters has a negative impact on local ecosystems Indonesia, foreign can spread disease, become main predators and cause imbalance the food chain. From this study, we report presence type Cichlasoma urophthalmus (Günther 1862) or Mayan Cichlid from tropical North America caught Kedung Ombo Reservoir, Grobokan Regency, Central Java. species identifi...

With over 600 species and coming in all sizes, shapes, patterns colors, Neotropical cichlids of Central South America are popular pet fish. But most don't start out with bright bold colors contrasting across their bodies. So just how does a drab juvenile turn into vivid adult? Denis Prazdnikov Fedor Shkil the Severtsov Institute Ecology Evolution, Russia, think that they've discovered answer: t...

Asymmetries in brain and behaviour have been demonstrated in numerous species representing all major vertebrate taxa, and may be a universal feature of the vertebrate nervous system. While descriptions of lateralization at the behavioural and neuroanatomical level are widespread, examples of correlation between asymmetries in behaviour and neural structures remain relatively scarce. In the past...

We have found evidence for ultraviolet visual capabilities in a Lake Malawi cichlid fish, Metriaclima zebra. Microspectrophotometry of single cones revealed a visual pigment with peak sensitivity at 368+/-4 nm. M. zebra also expresses a putative ultraviolet opsin gene whose sequence is closely related to the SWS-1 opsin for other fishes. Several other African cichlids have a functional copy of ...

background: the presence of pesticide due to the huge demand for agricultural purposes is very prevalent in surface waters of iran. these pesticides could finally accumulate in aquatic ecosystems and have been proved to have toxic effects on aquatic animals. the aim of this study was to assess the acute toxicity of diazinon, deltamethrin, butachlor and pretilachlor on zebra cichlid (cryptoheros...

The maintenance of colour polymorphisms within populations has been a long-standing interest in evolutionary ecology. African cichlid fish contain some of the most striking known cases of this phenomenon. Intrasexual selection can be negative frequency dependent when males bias aggression towards phenotypically similar rivals, stabilizing male colour polymorphisms. We propose that where females...

In this study, we have investigated the effects of mix of Tomato (Solanum lycopersicum) & Carrot) Daucus carota ( and red Bell pepper )Capsicum annuum( as a natural pigment source and astaxanthin as synthetic pigment sources on the skin colour of cichlid fish (Astronotus ocellatus sp., Agassiz, 1831), which are generally white with red patches in the dorsal skin. The fish were fed diets contain...