From natural reservoirs, bloodsucking annelids, leeches, can be brought into the aquarium. However, representatives of the genus Piscicola parasitize on fish, so aquarium fish of all species can seriously suffer from them. If the presence of these worms is noticed in the indoor pond, every effort must be made to destroy them. Fish leeches are quite large worms. Their length can reach 5 cm, so they can easily be seen in the aquarium and destroyed. They are called temporary parasites, because, having pumped the blood of their master, they leave him. After one feeding, the leech may not eat up to 3 months. These worms lay their eggs in cocoons, from which young leeches emerge. The duration of egg development depends on the temperature of the water and ranges from 13 to 80 days. Young worms are looking for a host whose blood they will feed on and grow. The transformation of young worms into adults takes up to 24 days. The worm has 2 suckers at the ends of the body. In the center of the anterior oral sucker is a mouth opening with numerous teeth. With them, he cuts the skin of the owner and sucks his blood. Leeches can be seen crawling on the ground or floating with wave-like movements.
Symptoms of the disease
Both adult worms and their eggs can be introduced into the aquarium. Therefore, often the aquarist does not even suspect the presence of parasites in the reservoir until the leeches grow to large sizes. Yes, and adult worms can not always be noticed, since they usually hide between stones or in thickets. However, their presence reveals wounds on the body of aquarium fish. Leech bite looks like a round red or whitish wound. It does not heal for a long time and can be secondarily infected. In a pond with blood-sucking worms, the fish are usually restless, and some sluggish due to blood loss. Leeches are also dangerous in that they can transmit various diseases to fish: viral, bacterial and invasive. Therefore, the parasites that appear in the aquarium must be mercilessly destroyed.
Since fish leeches are quite large parasites, they can be easily destroyed mechanically. In addition, each observed worm must be caught with a net and removed from the aquarium. This method is suitable for bodies of water in which the number of leeches is small. If leeches had time to lay eggs and multiply, it is better to use chemicals. Trichlorfon, which is used to destroy many external fish parasites, is detrimental to these worms. Since not all aquarium fish can easily tolerate this drug, it is better to place them in another tank, after examining for the presence of leeches on their skin. The treatment of the reservoir with trichlorfon must be carried out twice. Eggs in cocoons are resistant to the action of the drug, so after 2 weeks, when young leeches come out of the eggs, the treatment should be repeated.
Watch the video: How to fly fish using leech patterns (October 2020).