Characteristics Of Labeo Umbratus

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The internal and external anatomy of Labeo umbratus
Hannah Janse van Vuuren


The anatomy of an Labeo umbratus specimen, found in the Krugersdrif dam, was studied. Annotations of the positions of the internal organs as well as the external morphological characteristics were made. Upon further analysis, several characteristics were identified that would have eased life in aquatic environments. Some of these characteristics include, sensory receptors located on the head as well as on the lateral view of the body, the shape of the fish, specialised, paired appendages, respiratory structures as well as structures aiding the fish in buoyancy. The way in which the internal organs and the external appendages were arranged in and on the fish, showed great evolutionary adaptations to the water environments in
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Secondly, the elongated gonads are located beneath the swim bladder. This specimen was male because it only had one urogenital pore behind the anus and the bright orange tissue of the testis was found near the intestines. The digestive tract is then removed as a whole and consist of the esophagus, stomach, pyloric ceca, intestines and anus. The digestive organs are often covered with a fat layer of insulation purposes. The cream coloured liver and gallbladder are removed along with the digestive organs. These organs are then separated from the digestive tract by cutting the membranes that join them. The liver is the largest of all the internal organs and the gallbladder is green, because of the bile production.

After the before mentioned organs have been removed from the body cavity, the fat layer is removed in order to better observe the morphology of the organs. The heart is found in the pericardial cavity, between the gill rakers and the liver. Be careful not to puncture the heart and remove any blood
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