Reproduction in C. kelberi

[channarox]

I believe you are a sentimental person, this explains your losing sleep for one introduced species (Giant Snakehead) but not the other (cichla). You haven't tell me which native species of Singapore were threatened by cichla. Perhaps you have see my point

i was just giving an example to compare with the wolf fish...
channa striata are native here,also disappearing.
a few examples are,and these arent just endangered by cichla but many other introduced species,various rosbora and barb species disappear from resevoirs and now only found in small streams,grass carp young are frequently devoured by cichla,mainly native schooling fish.
all i was trying to say is that when cichla are released into any ecosystem they tend to destroy it by eating up everything and outcompeting other native predatory species.
this was my point.

 

[Rio Negro Lover]

Sorry for beating dead horse but I'd prefer to keep the record straight. Firstly, glad you have moved on re Giant Snakehead ~ !

If I understand correctly your point now is that Channa Striata, Rasbora and Barb were all endangered by Cichla. I think this is grossly misleading, I would say the culprit is your authorties that damed the low lands where the native fishes thrive.

Granted, some pockets (streams inlet etc) of the dammed up enviroment may hold certain population of native species but let us not kid ourselves; these fishes were never EVOLVED to adapt in a lucustrine enviroment. Go read up on barbs and rasboras and name me which one of them are pelagic and require no rivers, streams, skinny water or aquatic vegetation to breed. No? Why? Because there weren't any natural lake in your region to begin with. Now, what makes you think they could compete with Cichla that thrive in a lagoonish condition? So is Cichla the culprit? Ask yourself, who created the reservoirs in the first place? Are they natural or manmade? If they are manmade, then all of its inhabitants are officially 'introduced'. Can you blame Cichla for 'endangering' fishes that are not suppose to be there in the first place? This is my point.




Feel free to comment.

 

[channarox]

Sorry for beating dead horse but I'd prefer to keep the record straight. Firstly, glad you have moved on re Giant Snakehead ~ !

If I understand correctly your point now is that Channa Striata, Rasbora and Barb were all endangered by Cichla. I think this is grossly misleading, I would say the culprit is your authorties that damed the low lands where the native fishes thrive.

Granted, some pockets (streams inlet etc) of the dammed up enviroment may hold certain population of native species but let us not kid ourselves; these fishes were never EVOLVED to adapt in a lucustrine enviroment. Go read up on barbs and rasboras and name me which one of them are pelagic and require no rivers, streams, skinny water or aquatic vegetation to breed. No? Why? Because there weren't any natural lake in your region to begin with. Now, what makes you think they could compete with Cichla that thrive in a lagoonish condition? So is Cichla the culprit? Ask yourself, who created the reservoirs in the first place? Are they natural or manmade? If they are manmade, then all of its inhabitants are officially 'introduced'. Can you blame Cichla for 'endangering' fishes that are not suppose to be there in the first place? This is my point.




Feel free to comment.

you are absolutely correct.

but what i was saying was not to do with adaptation,environment,or having resevoirs blocked off.
i was SIMPLY stating that cichla are eating off whatever food source that is native to them WHERE THEY CAN BE FOUND,be it native or non-native.
im not blaming cichla for endangering any species,im saying they are outcompeting everything that SHARES THE ENVIRONMENT with them.
simply put,all those were all examples.
when i say native species are hard to find,i meant in places where the cichla can be found.
maybe i was not clear enough in my past posts.

 

[Rio Negro Lover]

Now I begin to see your point. The most myopic view of most Asian policy makers is that once they created a big body of water, they do not manage it well like 'true' first world countries. Look at our Tinaroo dam. In my opinion, your authorities should bring in some true pelagic foraging fish that can consume the omni presence micro organisms and breed in lacustrine enviroment. And the predators, be it Channa or Cichla are able to feed on them. That my friend, is sustainability in a manmade water.

 

[channarox]

Now I begin to see your point. The most myopic view of most Asian policy makers is that once they created a big body of water, they do not manage it well like 'true' first world countries. Look at our Tinaroo dam. In my opinion, your authorities should bring in some true pelagic foraging fish that can consume the omni presence micro organisms and breed in lacustrine enviroment. And the predators, be it Channa or Cichla are able to feed on them. That my friend, is sustainability in a manmade water.

i think we do have foraging fish...and lots.
most of them are introduced species.
do geophagus and tilapia count?
what about other various cichlids and catfish species?

 

[Rio Negro Lover]

i think we do have foraging fish...and lots.
most of them are introduced species.
do geophagus and tilapia count?
what about other various cichlids and catfish species?

Good start to have these two cichlid but it could do better. Why? Because the way I see it, they share the same habitat as Cichla and Snake head thus;

1. The fries of these predators have to compete with these two foraging cichlids for lower order food in the littoral region.

2. Competition of spawning ground, also, Earth eaters and Tilapia are well-known egg eaters.

In another word, the limiting factors of the predators are the food source for their fries and competitive spawning ground.

I think the best way to go about it is to introduce true pelagic foraging fish that are also pelagic spawner, and feed on phyto and/or zoo plankton outside the littoral zone which are not utilized by the fries of the existing predators. Bony Bream of Oz, Silver Carplet (Amblypharyngodon meletinus) of Sri Lanka, Freshwater Sardines (Limnothrissa Miodon) of Lake Tanganyika, etc.. all these species are the important link between plankton and predators from the waters they are found. And most importantly, they were evolved in lacustrine enviroment.

 

[channarox]

Good start to have these two cichlid but it could do better. Why? Because the way I see it, they share the same habitat as Cichla and Snake head thus;

1. The fries of these predators have to compete with these two foraging cichlids for lower order food in the littoral region.

2. Competition of spawning ground, also, Earth eaters and Tilapia are well-known egg eaters.

In another word, the limiting factors of the predators are the food source for their fries and competitive spawning ground.

I think the best way to go about it is to introduce true pelagic foraging fish that are also pelagic spawner, and feed on phyto and/or zoo plankton outside the littoral zone which are not utilized by the fries of the existing predators. Bony Bream of Oz, Silver Carplet (Amblypharyngodon meletinus) of Sri Lanka, Freshwater Sardines (Limnothrissa Miodon) of Lake Tanganyika, etc.. all these species are the important link between plankton and predators from the waters they are found. And most importantly, they were evolved in lacustrine enviroment.

problem,we dont have much plankton in our waters i think.
these arent the only two cichlid species,theres also red devils,midas,oscars,green terrors,lots lots lots...
tilapia have actually become the most common fish here apart from mosquito fish...
theyre everywhere.
and yet the cichla population still goes strong.

 

[Rio Negro Lover]

I don't think that Singapore has poor plankton production. Two reasons;

1. Tropical climate is conducive for plankton production due to its rainfall, temperature and sunlight.

2. The rotting of organic matters via seasonal indunation (high and low water) and surrounding rain forest produces food source for plankton.

If you could get hold of Seiichi Cards to compare the colours of the reservoir, that will give you an idea of the amount of phyto and zoo plankton available.

 

[channarox]

I don't think that Singapore has poor plankton production. Two reasons;

1. Tropical climate is conducive for plankton production due to its rainfall, temperature and sunlight.

2. The rotting of organic matters via seasonal indunation (high and low water) and surrounding rain forest produces food source for plankton.

If you could get hold of Seiichi Cards to compare the colours of the reservoir, that will give you an idea of the amount of phyto and zoo plankton available.

cool.cool.
i dont know much about local waters so...yea.
you know your stuff.

 

[Rio Negro Lover]

That's what forum is all about; sharing...