Greater Cormorants: Fishing Experts

During these winter months, a number of migratory birds visits India from the countries where winter is very severe and also food availability is low. These annual visitors add colour to the season.

Many of the migratory birds are water waders and land in the lakes , big pools and other water bodies. Amongst these are greater Cormorants. They are huge birds and expert fishers. They hunt in groups and there is great jostling and fighting for the catch snatching.

In older days the trained Cormorants were used for river fishing in Japan and China. A snare was tied at the end of the neck which in addition to keeping the cormorant under leash also prevented the Cormorants from eating the fish except for smaller ones. As soon as the bird caught a fish, it was taken out from water and made to spit out the fish.

Nowadays, it is only a tourist attraction.

These days a number of these big birds have descended on Sulkhna Lake in Chandigarh. I took some pictures.

 

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A group fishing
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Sun soaking on a tree
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Of all the predators Man is super predator

Darwin, the father of evolution, had postulated that the species evolve constantly to adjust to the changing environment and climatic changes but this change is gradual in nature and takes place over thousands of years. But man is proving him wrong. Being an expert killer backed by technical advanced equipment, man is bringing rapid changes which are perceptible within much shorter time.Man is super predator and its peculiar hunting preferences are forcing many species particularly of fish and large sized land animals to evolve at a rapid pace than the nature would have done. There are stories of attacks by sharks on people venturing into sea and of being killed by lions or other carnivorous animals but they fade away when compared to the man. Scientists at the Victoria university at British Columbia in Canada who are studying the changes and the harm being brought upon the fauna by the man has termed the man as “Super Predator

In general the man hunts the largest of the animals. For examples adults of lions and tigers to flaunt them as the trophies of their valour and skill as opposed to the hunting animals who generally go far the weakest and younger prey. Thus the man depletes the mature “reproduction capital” instead of the “reproductive interest” of the hunted species. For example, fish is caught in the nets and nets are so constructed as to retain the larger fish and filter out the smaller ones.

This is causing the the fish to mate early and produce the smaller broods. The size is diminishing. This is because the fish is also evolving techniques to survive and producing fish of smaller varieties which can pass through the larger net openings.

Man has hunted the sea creatures 14 times more than the sea predators and 9 times more than the land animals. Man is going for the bigger animals like sharks, tuna fish and marlin. This is changing the ecosystem at a much faster pace than nature.

  

Over Killing of the land predators has resulted in the increase of herbivore population. This increase is putting pressure on many resources and robbing the food from insects and birds which we cherish. And also resulting in producing the disease prone herbivorous animals.