What are the pathogenic factors of common diseases in forest frogs?
Like other animals, the occurrence of disease in forest frogs is related to three factors. The first is internal factors, that is, the strength of the forest frog's own constitution; the second is pathogenic microorganisms; the third is external environmental conditions, which also include human factors. If there were no pathogenic microorganisms, even if the frog's constitution were somewhat weak, theoretically the forest frog would not become ill.
However, in the living environment of forest frogs, it is impossible for pathogenic microorganisms not to exist. In reality, forest frogs cannot live under sterile conditions, which means there are a large number of microorganisms in their living environment. Yet in some areas, frog farming does not lead to disease, while in other areas forest frogs become ill; even in areas where disease occurs, not all forest frogs become ill. There are sick frogs and also frogs that do not become ill, which shows that illness in forest frogs is closely related to the strength of their own constitution. Poor environmental conditions often cause forest frogs to become ill on a large scale, and this is also well known to people from frog farming practice.
In summary, the occurrence of frog disease is affected by three factors: the forest frog, pathogenic microorganisms, and environmental conditions. Therefore, the analysis of the causes of forest frog diseases, the prevention of frog diseases, and the treatment of frog diseases should all be established on the basis of this understanding.
External causes are the conditions, internal causes are the basis, and external causes work through internal causes. Eliminating pathogenic microorganisms and creating suitable ecological and environmental conditions and excellent rearing techniques for forest frogs are the theoretical basis and foundation for the prevention and treatment of frog diseases.
1. Environmental factors causing disease in forest frogs. Tadpoles live in water, while young frogs and adult frogs live under the forest or in artificially simulated ecological environments. Forest frogs also have a long overwintering dormant period. External environmental conditions such as water temperature, air temperature, and light play an important role in the feeding, activity, growth and development, and reproduction of forest frogs. When the external environmental conditions on which forest frogs depend for survival change, this will inevitably affect a series of life activities and the intensity of metabolism of forest frogs, and may cause disease in forest frogs to varying degrees. The dissolved oxygen content in water is closely related to the survival of tadpoles.
When the dissolved oxygen content in water is low, the intensity of metabolism is low, the constitution becomes weak, and disease occurs easily, or even death by suffocation. The pH of the water also has a clear effect on the growth and development of tadpoles. When there is too much humus in tadpole rearing ponds, and when residual bait and other substances are decomposed by microorganisms, harmful gases such as hydrogen sulfide, marsh gas, and carbon dioxide are released, which can poison tadpoles. Young frogs and adult frogs exposed to strong sunlight, and forest frogs with dry skin during the hibernation period, can all suffer heavy mortality.
2. Biological factors in the occurrence of frog disease can be summarized into two major categories: one is plant pathogens, such as viruses, bacteria, and algae fungi; the other is animal pathogens, such as protozoa, parasites, and worms.
3. Human factors in the occurrence of frog disease. These are caused by improper artificial technical handling, which makes the forest frog's constitution weak and lowers immunity, causing disease in forest frogs. Improper stocking density, feeding a single type of bait, and incomplete nutrition; feeding spoiled bait, causing changes in water quality; failure to thoroughly disinfect the breeding site, and failure to disinfect breeding frogs purchased from other places, introducing bacteria and parasites; failure to promptly remove sick tadpoles and sick frogs, causing the spread of pathogens and repeated infection: failure to manage each stage of forest frog growth, development, and reproduction scientifically can also cause disease in tadpoles, adult frogs, and young frogs.