Fish/fishing

 Valued but threatened natural resource. Fish are a valued natural resource found in most aquatic environments. Fishing is carried out as recreation or as a profession and it is regulated in several different laws, ordinances and regulations. The amount of fish, species composition, age and size varies naturally between different water environments, but also depending on how the fishing is conducted and on what otherwise affects the quality of the current water environment. 

Fish are central to the aquatic food web. This means that they can be directly affected by changes in the environment such as increased water temperature or environmental toxins, but also by changes that occur at other trophic levels such as changed availability of food or the number of predators. Fishing has a major impact on the size and condition of fish stocks.

The monitoring of fish is carried out both nationally and regionally in seas, lakes and waterways. The data that is collected is the basis for designing sustainable fish management, for example by creating favorable habitats or by regulating the fishing of certain species. Environmental monitoring's recurring sample fishing creates coherent time series, which means that you can see trends and detect changes caused by, for example, environmental destruction, overfishing or changing climate. 




THE CONDITION OF FISH IN THE SEA AND ON THE COAST VARIES GREATLY. DUE TO OVERFISHING, STOCKS OF CODFISH AND CARTILAGINOUS FISH IN THE SEA ARE AT HISTORICALLY LOW LEVELS. IN THE BALTIC SEA, THE BIG SPIKE HAS INCREASED SIGNIFICANTLY IN RECENT YEARS.


The condition of coastal fish varies greatly between different locations. Since the 1970s, the stocks of freshwater species have increased in the Baltic Sea, while the stocks of saltwater species have decreased. Perch and roach are the most common species encountered in the coastal test fishery, and their stocks are relatively stable in most test fishing areas. Sturgeon, common tern and gannet are also common along the entire coast. Catches of flounder in the southern parts of the Swedish Baltic coast and zander around the Stockholm archipelago have been relatively low in recent years. In the Gulf of Bothnia, the whitefish catch has increased slightly in the coastal test fish and the black-mouthed butterbur has established itself on the Swedish coast south of Gävle.

The conditions and condition of freshwater linked to fish and fishing are so variable that it is difficult to draw general conclusions about the condition of small and large waters. Both natural conditions and effects of human activities vary, both locally in different parts of the water systems and more regionally between different parts of the country. In addition, the national fisheries management covers only the very largest lakes.  


 

Comments

Post a Comment

Popular posts from this blog

LICENSE FOR FISH/FISHING IN KATTEGATT

Image
 Stocks of cod and many other fish species are at historically low levels in the Kattegatt and Öresund. The introduction of the fishing-free area in the southern Kattegat initially showed positive signs for cod and crayfish , but cod has since declined again. Other positive signs are that the stock of plaice in the Kattegat is increasing. Coastal stocks are dominated by flounder and there are a lot of shore crabs, while the predatory fish are few and small. Cod stocks in the Kattegatt increased from very low levels in the late 2000s partly as a result of the no-fishing area and technical regulations. In recent years, however, the stock has shown a declining trend again. It is now at the lowest level ever measured. Gray whiting in the Kattegatt, which belongs to the same stock as that in the Skagerrak , has increased since the bottom in the early 1990s but only to about half the levels in the mid-1970s. The stock of plaice in the Kattegatt and Öresund has increased steadily since 20...
Read more

Oscar Fish Care Guide

Image
Oscar Fish Care Guide The Oscar fish, scientifically known as Astronotus Ocellatus or commonly known as River Dog or Dog Fish, is one of the largest South American cichlids reaching approximately 12 inches in length and is a fascinating fish to keep as a pet.  Oscars are very docile fish in relation to their owner, but you have to be very careful around your tank mates. They are not very difficult to care for, so many aquarists who can afford a large tank and love cichlids start by keeping Oscars. tank requirements First of all, being so large, Oscars will need a very large tank, 125 gallons minimum for one fish or a pair.  Like all fish, the water must be very clean, so you must use a very powerful filter, since fish that big produce a lot of waste. Oscars are tropical fish, which means they like their water to be between 72 and 77 degrees Fahrenheit and do well in slightly acidic water with a pH between 6.5 and 7.2. They prefer weak water movement, but you should use at lea...
Read more

Neon Fish – Neon Tetra

Image
  The neon tetra  is a small freshwater fish native to South America.Due to its vibrant colors and ease of care, it is one of the most popular fish  among fish breeders.Its peaceful temperament and simple dietary needs make it an ideal fish for beginners. Common name  -             Neon Fish, Neon Tetra Scientific name -            Paracheirodon innesi, Hyphessobrycon innesi Aquarium capacity  -    37 liters, 75 liters for a school of 15 specimens Temperature  -                Between 21° and 28° C pH -                                 Between 4 and 7.5 GH -                              Less than 8 Temper-                     ...
Read more