Perchlet (Chanda nama) or Commerson's glassy perchlet (Ambassis ambassis) causes many problems such as cause injury to the external organs of culture fishes.
Farmed exotic Silver carp (Hypophthalmichthys molitrix) are mostly susceptible as Perchlet feed on their scale, subsequent infection caused by other opportunistic pathogens thus caused mass mortality and economic loss as well. Moreover, organs of many other cultured species were reported to injured eg. eye, sale, lateral line etc in culture pond.
So, How can I manage or control the Perchlet (Chanda nama) or Commerson's glassy perchlet (Ambassis ambassis) in culture pond? I am waiting for your valuable comments.
Not so easy to tell as I don't know the exact local situation in your case.
Depending on the type of pond, the only method I can think of is removing the ambassids completely using a relatively radical method: 1) take out your culture fish; 2) dry up the pond completely; 3) prevent the ambassids from entering the pond again when you refill the water, e.g. by using fine-meshed nets.
Item 3) may be the most difficult part. If ambassids manage to recolonise the pond after a while, you would have to repeat the procedure.
Dear Ronald Fricke,
Thanks for your nice suggestion. However the conditions are commonly happen in large perennial ponds where cap poly culture systems are practicing/ existed with some modification and most of the cases are like these in Bangladesh. For example, recently a farmer namely Md. Golam Mustafa, an Entrepreneur of Agro-Business (Lease holder of a large perennial pond comprising water area of 23.00 acres (1 hectare equal to 2.47 acres) namely DHARMA SAGAR Located in Comilla, Bangladesh, which is almost impossible to dry-up). Recently the culture fishes of DHARMA SAGAR were severely suffered from this problems (Perchlet (Chanda nama)/ Glassy perchlet (Ambassis ambassis) and subjected to faced financial losses of approximately BDT 2500000 (25000 Euro). He asked me concerning the problem however still I can't provide any applicable solution to him. Any way, sincere thanks to Ronald Fricke for your valuable answer.
I was afraid that conditions were like this.
In a large perennial pond, you may try to reduce the ambassids by electrofishing, but there is no way of getting rid of them completely.
I wouldn't suggest more destructive methods as they would harm the long-term success of fish-farming as well.
Yes, Dear Ronald Fricke,
The condition is really embarrassing to all of us that is why many of our colleagues and experts seriously thinking regarding the matter. Any way sincere thanks to again for your critical evaluation.
The species of Ambassis typically enter ponds with flooding events. They are relatively small, but prickly, carrying strong spines mainly in the dorsal and pelvic fins, so it takes larger predators to hunt them. Such larger predators you would rather not like to have in an aquaculture; they would prefer the younger stages of the cultured fishes which are easier to hunt, and are not so spiny.
In theory, it might be possible to control ambassids with parasites, which may be host-specific, but unfortunately the parasites of ambassids have not been well researched as far as I know.
Dear Alireza Ghaedi
I will Convey your best regards to Dr Muhammad Anamul Kabir, one of the scholar of our Faculty of Fisheries.
Any Sincere thanks for your valuable suggestion.
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