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They take in air at the surface, and pass it through the intestine where the mucosa absorbs the oxygen and carbon dioxide waste is released through the vent.

As a consequence, they may be very sensitive to air pressure changes and become restless when it falls and can be used to predict the weather.

None of the Iranian fishes are used in this fashion but they can be quite colourful. taenia is a potential fishing bait for predatory fishes such as Sander lucioperca and has been examined experimentally for this purpose in Turkey (Kuşat et al., 1995).

Genus Cobitis Linnaeus, 1758 These fishes are found in Europe, North Africa and Asia. They are known generally as سگ ماهي (sag mahi meaning dog fish) in Farsi, the equivalent of loach in English.

The origins of this group of loaches may well lie at the end of the Eocene or in the early Oligocene in South China, spreading along a northern route through Europe and Siberia during the Oligocene-Miocene-Pliocene period and then later southwards into Southwest Asia (Sawada, 1982; Menon, 1987; 1992; Bănărescu and Nalbant, 1998; Šlechtov et al., 2008; Tang et al., 2008).

Foods are mostly small insects, worms and crustaceans detected by the aid of the barbels on the habitat bottom. Most species bury themselves in sand or mud during the day, emerging to feed at night.

Movement is by undulations of the body, particularly marked in the more elongate species.

The body form is fusiform to rounded or elongate; the mouth is subterminal and has 3-6 pairs of barbels; the mental lobes of the lower lip have two parts: the anterior which is usually short and sometimes divided into lobules, and the posterior which is flap-like and longer and sometimes divided into 2 or more barbel-like extensions; there is 1 row of pharyngeal teeth; and there is an erectile spine in a groove below the eye (anterior in a non-Iranian genus).

Iranian species have one pair of rostral barbels and a rounded or slightly emarginate caudal fin and belong to the subfamily Cobitinae.

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