| Anabas | |
|---|---|
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| Anabas testudineus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Anabantiformes |
| Family: | Anabantidae |
| Genus: | Anabas Cloquet, 1816 |
| Type species | |
| Perca scandens | |
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| Native distribution of Anabas species | |
Anabas is a genus of climbing gouramies native to southern and eastern Asia. In the wild, Anabas species grow up to 30 cm (1 ft) long. They inhabit both brackish and fresh water.[2] Anabas species possess a labyrinth organ, a structure in the fish's head which allows it to breathe atmospheric oxygen, so it can be out of water for an extended period of time (6–8 hr), hence its name from the Greek anabainein ‘walk up’, from ana- ‘up’ + bainein ‘go’. They are carnivorous, living on a diet of water invertebrates and their larvae, and - in contrast to most of their relatives - are scatter spawners with no parental care. Species are found in South Asia, including India, Sri Lanka, Bangladesh, Burma, Indonesia, Malaysia, Thailand, Cambodia, and the Philippines.
Species
There are two recognized species in the genus Anabas:[3]
- Anabas cobojius (F. Hamilton, 1822) (Gangetic koi)
- Anabas testudineus (Bloch, 1792) (climbing Anabas)
Reproduction
Anabas from hatching to sexual maturity are about 7.5 - 8 months old. The average fish weight is about 50 - 70 grams/fish. Fish will bring eggs around the 11th lunar month (for fish raised in ponds, when the weather gets cold) and April - May of the lunar calendar (for wild fish). Distinguishing between male and female: male fish have a more elongated body than female fish. Male fish have white semen when they are in heat. Use your hand to gently stroke under the abdomen from the pectoral fins to the anal fin. The semen that escapes is milky white. This is the time of maturity, the fish is ready to reproduce. For female fish, when carrying eggs, their abdomen will be swollen and soft. If you gently stroke it with your hand, the eggs will jump out, signaling that the fish is ready to spawn.
Fish spawn in the wild: pair up to reproduce on their own. After the rains, or the water level changes (due to tides), external conditions are suitable - stimulating fish to reproduce. Reproduction mode: pair reproduction. Due to excitement, during the breeding process, both female and male fish will continuously launch out of the water. The fish's spawning grounds are along the banks of ponds, fields - canals - ditches, where the water is shallow - quiet and has lots of grass - aquatic plants. The female fish will lay eggs in the water, and at the same time the eggs are laid, sperm from the male fish is released. The eggs are immediately fertilized and float to the surface of the water thanks to the layers of yellow oil released at the same time as the eggs.
Because fish do not have the habit of protecting eggs after spawning (on the contrary, sometimes they even return to eat newly laid eggs), so the amount of eggs laid is very large (compensating for loss due to lack of fertilization and damage from enemies). , usually > 3000 eggs/female. 15 hours after fertilization, the eggs will begin to hatch into fry. Hatching time depends on temperature: temperature from 22 - 27 degrees - fish embryos will die or eggs will hatch after 24 hours. Temperature from 28 - 30 degrees: eggs will fully hatch in 15 - 22 hours. If the temperature is >30 degrees, the embryo will die or the hatched fry will be deformed.
In artificial reproduction: after selecting mature parent individuals, people inject a sex hormone called LRHa and put the parent fish into breeding tanks or jars with lids. After about 8 hours of injection, the fish will spawn. The purpose of injecting sex hormones: fish that spawn simultaneously will be proactive in the number of fingerlings, the size and quality of the fingerlings. Fry after hatching about 12 hours can search for food on their own in the water body. After about 1.5 months of spawning, the parent fish can become sexually active again and continue to reproduce.
Food
Anabas are omnivores. They can eat mollusks, small fish and plants, including grass. They can eat organic and inorganic substances considered "dirty" in the water. It can eat each other in case of hunger. So sizing is very important. Field Anabas are abundant in the fields of the Northern region.
External link
- Anabas testudineus Lưu trữ 2005-05-28 tại Wayback Machine
- Climbing perch
- Anabas Restaurant
References
- ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Anabas". Catalog of Fishes. California Academy of Sciences. Retrieved 11 December 2019.
- ^ Tay, Yi L.; Loong, Ai M.; Hiong, Kum C.; Lee, Shi J.; Tng, Yvonne Y. M.; Wee, Nicklaus L. J.; Lee, Serene M. L.; Wong, Wai P.; Chew, Shit F.; Wilson, Jonathan M.; Ip, Yuen K. (2006). "Active ammonia transport and excretory nitrogen metabolism in the climbing perch,Anabas testudineus, during 4 days of emersion or 10 minutes of forced exercise on land". Journal of Experimental Biology. 209 (22): 4475–4489. doi:10.1242/jeb.02557. PMID 17079718. S2CID 19028025.
- ^ Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Anabas in FishBase. December 2012 version.
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This page was last edited on 15 April 2024, at 13:10