Fish migration

Mekong and its Effect on Fish Migration in Thailand Dams have many purposes, such as storing water in order to combat fluctuations in river flow or demand for water, raising the water level so that the water can be directed to flow into a canal to generate electricity, control flooding, and provide water for agriculture, households and industries (Silvia, 1991). With an increase in demand for cleaner sources of energy, many countries have turned to damming as a solution. The Southeast Asian countries that the Mekong river flows through have recently become increasingly interested in damming the Mekong river.…

1. Effect of obstructing hydraulic structures on the fish fauna: Dams, barrages, weirs or navigation locks built on a river for various purposes act as obstruction to the migration of the fishes. Various effects of such hydraulic structures are as follows: a) Barrier to the movement of fish to their spawning grounds. Several fish species require special regions to spawn. These hydraulic structures obstruct the movement of such species to their upstream spawning grounds where they reproduce. As…

Introduction There are over several hundred species of sharks that range in size from less than 10 inches to over 20-30 feet long. The largest fish and shark in the world is the whale shark, which is believed to be a length of 30 feet long. Sharks are often stereotyped as dangerous and violent, and while in some cases this is true, but in today’s world they are captured and killed annually for a demand in their fins which leads to overfishing and illegal fishing, depleting shark populations…

negative impact on water consumption and the fish species. Knight and Rummel attempt to explain the pros and cons of dams. The movie also features the tale of salmons, which are unable to return to their original spawning grounds due to dams. These create issues for fish companies, the hatcheries that go at a loss due to reduction of number of fishes. The documentary advocates for change in the United States of America…

Evidence The giant catfish is uncommon yet broadly presented through the Mekong Basin. Mature fish seem to be found in major channels of the Mekong River and its tributaries. Juvenile fish seem to stick around wetland areas of the Mekong Basin. In the dry season mature fish migrate vast distances up river and start spawning when the rains arrive. The eggs and hatchlings are being transported downstream where juveniles may scatter into floodplains and other wetland zones. Not much information is…

You have probably heard of the Great White Shark and the Bull Shark. They are some of the scariest ocean predators. These two are in some ways similar, but they are very different, too. You will want to know how to tell the difference between the Great White and the Bull shark. To tell these two sharks apart, just see how different and similar they really are. There are some similarities between the two sharks like color, appetite, migration, and where they live. The sharks are similar in…

In my research on the Osprey I found that it has such unique characteristics that it has been given its own taxonomic genus, Pandion, and family, which is the Pandionidae. An Osprey gravitates towards shallow fishing grounds because they are unable to dive more than about three feet below the water’s surface, therefore, their habitat includes almost any shallow fish-filled waters, such as rivers, lakes, reservoirs, swamps, or marshes. It is the only hawk on the continent that eats almost…

bring back their numbers. Many factors may have played in this rapid decline of fish, some may include over harvesting, habitat loss, and the increase of hydropower dams. On a salmon's route back to the ocean, there are over eight major hydro powered dams on the snake river itself, not including all the smaller dams used for irrigation. In a National Wildlife article in 2006 it Ken Olsen wrote “Salmon numbers…

The cod fish has become a major topic of conversation across multiple reaches of different conversation. The once vastly abundant cod fish has dwindled in numbers. The impacts of the depleted cod populations have had great impacts on worldwide economies and ecological systems. It is important to acknowledge how we came to be in such a situation and how our past actions in regards to cod fish will shape our present and future actions. The purpose of this paper is to provide a brief chronological…

The effects of the dying cod population in New England In the Northeastern United States the population of cod is decreasing, and causing fishermen to adapt to different species of seafood or end their fishing career. Since the turn of the century the amount of cod in the waters between Nova Scotia and Massachusetts has decreased by over 75% (Horowitz,2015). This decrease has been blamed on the strong fishing community in the Northeast, overfishing being the main reason. Due to this, several…