Positive And Negative Effects Of The Nile Perch

Now days times have changed. You can no longer enjoy the things you once could. It has become dangerous to waterski or to even enjoy a boat ride down the river due to the Asian carp. These fish are startled easily by boats, and small watercraft. They can jump ten to twelve feet out of the water causing damage to boats and injuring humans. I have heard of people getting cuts from the fins, black eyes, concussions, broken noses and jaws, and even knocked unconscious from this species of fish. Not only are these Asian Carp causing physical damage, they are wreaking havoc on the ecological system. The main concern from the Asian Carp is the dangerous effects that it is bringing to our ecosystem. As an avid fisherman, this is of great concern to me. This will not only affect me as a fisherman, but also possibly hunters, bird watchers, boaters, even jet skiers and water skiers are

Studies have repeatedly shown that as oxygen concentrations decrease, the abundance and diversity of fish decrease (Breitburg). Fish kills, in which large numbers of dead and dying fish float to the surface or wash onto shore, are probably the most dramatic and publicly visible manifestation of hypoxia and nutrient over-enrichment of coastal waters(Breitburg). In addition to mass mortalities that are easily observed, high mortality of fish lacking a swim bladder can occur leaving little or no visible evidence of fish at the surface or littering beaches (Breitburg). With no fish, shrimp, or crabs the Louisiana fishing market takes a huge hit that the economy feels in a major way. The gulf accounts for almost one-fifth of the countries fishing landings, which total to be three billion dollars (Petrolia). Fishing is not only a major part of Louisiana’s economy but also its culture. Without wildlife in our waters microorganism are given more opportunity to grow leading to bacteria infected waters. These bacteria infected waters could cause major health risks for those who come in contact with

The population of many fish species have decreased drastically through the years and, even with current regulations,

Asian Carp where brought to America in the 1970’s because of their ferocious appetites, to keep algae and other matters out of ponds on catfish farms. Asian Carp average a full-grown length of five feet, and can surpass one hundred pounds. They breed and populate, and grow very quickly. Asian Carp are adversely affecting their un-natural environments by starving out native pond and river inhabitants. They have been slowly but surely migrating up the Mississippi River since their introduction to the Georgia portion. Their imminent arrival to the Great Lakes of Michigan has become a serious concern. This would be an issue because the Great Lakes are currently home to more than 43 federally protected species of fish. An invasion by Asian Carp

Boats are very common on the lake, both for fishing and recreation. The lake is a popular to anglers looking for kokanee salmon (Oncorhynchus nerka) and lake trout (Salvelinus namaycush). Other fish like rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta) are also abundant in the lake. Mysis shrimp were introduced into the lake many years ago. They have had an impact on the kokanee salmon and will be analyzed in the final paper. The fishing industry provides income for the area, as well as jobs. As of recent, the populations of kokanee salmon and lake trout have been in a decline. The interaction of human management on these fish populations is needed in order to help increase these fish abundance in the lake. This issue is also linked to the management of water in the lake because water levels impact the way that fish species

It was interesting to read that the hypothesis provided by the scientists turned out to be opposite of what happened to Valley Creek. The macroinvertebrates were already living in a low quality creek full of pollution, so I would have also expected their population to decrease after introducing a predator to their environment. The crayfish reminded me of the keystone species sea stars, that I learned about through a lecture on communities and ecosystems. The study conducted on crayfish was similar to a study conducted on sea stars, except they were removed from coastlines instead of being added to see the effect they had. The sea stars were believed to have a negative effect on the coastlines since they preyed on mussels, but it turned out

Average Yellow Perch length (TL) ranged from 87 (age 1) to 223mm (age 5), whereas, Pumpkinseed length ranged from 47mm (age 1) to 194mm (age 6) which is similar to other findings in many lakes in North America (Scott & Crossman 1998; Pierce, Rasmussen, & Leggett 1990). Pumpkinseed growth was constant for the first 4-5 years, then began to slow, whereas, growth in Yellow perch was constant for the first 2-3 years and began to slow which is similar to other studies (Copp, et al. 2004; Lauer & Doll 2007). This may be due to maturation age when energy is allocated to reproduction (Roff 1983). Purchase et al. (2005) studied life history traits of Yellow Perch in many Ontario lakes and found that Yellow Perch mature around age 2 (Purchase et al. 2005). Maturation age in Pumpkinseed is variable between lakes, but many reach maturity in their third year (Copp et al. 2004). Our results indicate that Pumpkinseed in this population may mature later since growth doesn’t appear to slow until after age 4-5 years.

It is unclear why the Nile perch entered Lake Victoria, but there are some local theories. The local people around Lake Victoria were saying that the fish was purposely put into the lake, by the government. This was said because the fish inside the lake were growing too rapidly and the government wanted to get rid of the over populating fish.

During the many sessions we had to investigate and research the health and condition of Steele Creek; at the same time we also hypothesized that “If the results indicate that Steele Creek is in the optimum range for damselfly nymphs then damselfly nymphs will be abundant.” The many experiments we conducted on the creek provided us with crucial findings that showed Steele Creek was in the lower range of ‘good health’. The several experiments we conducted consisted of a: Habitat Survey, Soil Analysis, Water Analysis and Macro-Invertebrate Identification. These tests were restricted to the section we chose of Steele Creek (excluding the Macro-Invertebrate test) . This allowed us to compare an array of aspects of Steele Creek’s water such as pH level and turbidity , giving us an insight into the kind of species that the Steele Creek habitat could sustain and the very nature of it. The fact that the the investigations were conducted at different times, dates and conditions, suggests a possible variation in our results.

Anadromous salmonids, which travel between freshwater and saltwater, is an example of how habitat loss can change evolutionary patterns. Dams constructed for hydroelectric power generation are blocking the access for these fishes, but culverts and river engineering have also reduced the amount of habitat that anadromous fishes can use (Furniss et al. 1991; NRC 1996). These results suggest that loss of habitat will alter evolutionary patterns in salmonid populations.

Over 128 Animal species are strongly believed to be extinct since European settlement in Australia. In an act to prevent marine pollution by controlling dumping of wastes and other matter, the Environment Protection Sea Dumping Act 1981 was introduced. The legislation outlines the policies and procedures to gain access to Australian waterways (Australian Government Department of Environment, 2015). The current legislation are not able to fully protect the natural environment, as the legislation only implies that permits are required for all sea dumping operations and for those court weak consequences are applied. For those reason, the Sea Dumping Act has been criticised for its ineffectiveness to control the waterways. This essay

This test pointed out that water is acidic at point 1 and 8. The acidity of water varies along the river because the concentration of salt is different. Salt helps maintain the pH of water. According the human activity, for example farming, less fresh water floes into the downstream so the pH at different point varies to each other. The suitable pH for perch survive is between 6.5 and 7.6. At point 6, where near the city and large number of dead perches were found, the pH is 7.3 which suitable for perches survive and in nature pH. Therefore, the acidity did not responsible for the death of the

The Nile River is divided into two major tributaries the Blue Nile and the White Nile. The Blue Nile rises from Lake Tana and flows through Sudan. The White Nile rises from lakes in the central part of Africa and flows into Sudan. The two rivers meet in Khartoum, Sudan where they flow northward that empties into the Mediterranean. The Nile River had a huge impact on the Egyptians, without the Nile the Egyptians would have never existed.

The Nile created a civilization. How did the Nile help Egypt? The Nile created the civilization known as "Egypt". The Nile provided clean water, rich soil for vegetation and large areas of flat land for people to live. The Nile provided many things to help Egypt grow and become a great place to live.

Ancient Egyptians started to settle around the coast of the Nile river back in 3000 B.C. The Nile river is a river that lasted for hundreds of thousands of years that you can still see to this day. It’s located in the north-eastern part of Africa, which technically runs down Egypt into the mouth of the Mediterranean Sea. The Nile River has improved the lives of many in Ancient Egyptian times. This includes the help of transportation from one place to another to trade and transport, fertile soil to farm and grow crops for food and trading, also, the river provides animals for eating that come downstream, this includes fish, sea creatures, birds, and big creatures like hippos! Now we’ll be talking about more in-depth how the Nile River affected