Dispersal of Fish Eggs by Water Birds – Just a Myth?

How do fish end up in isolated bodies of water when they can’t swim there themselves?

Small pond in the forest: This is only accessible by land, but there are fish here
Small pond in the forest: This is only accessible by land, but there are fish here. (Picture: University of Basel, Department of Environmental Sciences)

Small lakes with a surface zone of under 100 m2 speak to the greater part of worldwide freshwater biological communities. Most of these lakes are found in remote, regularly uneven zones with no inflow and outpouring. However, in the greater part of these lakes, there is fish. So how do fish reach lakes and lakes that are not associated with different waterways?

For centuries, researchers have assumed that water birds transfer fish eggs into these waters. But now, scientists at the University of Basel shed light on this. They have shown that there is no evidence of this to date.

Some of the natural leading scientists have already solved this question in 19th century, They also concluded the same, water birds must be responsible for fish dispersal.

In a new study, scientists have shown that despite the fact that the exploration group views this as a demonstrated hypothesis, no investigations have been distributed to affirm it. Scientists particularly conducted a systematic literature review. They found no in-depth scientific studies exist to prove that water birds disperse fish eggs.

Scientists also used the same approach to look for evidence of the dispersal of aquatic invertebrates. They found numerous scientific publications supported by experiments and field studies.

During the study, scientists reviewed some online forums and surveyed around 40 experts from research and industry. They determined the commonness of the hypothesis of fish dispersal by water winged creatures both inside and outside the exploration group. The dominant part of specialists that partook in the study found the hypothesis so conceivable that they esteemed the puzzle to have been comprehended. Nonetheless, none of them could draw on any exact proof.

Dr. Philipp E. Hirsch from the University of Basel said, “The lack of evidence does not mean that water birds are not responsible for the dispersal. But we simply do not yet know what roles are played by birds, humans and other processes.”

Understanding how fish are scattered in remote waterways is imperative for the upkeep of biodiversity. The information of how species colonize new territories frames the reason for the conservation of shelters and focused on reintroduction and furthermore keeps the spread of obtrusive species.

The paper is published online in the journal Fish and Fisheries.