On May 11, Japan's Diet voted to pass the revised Alien Biological Law, which would ban the sale or release of Mississippi red-eared turtles and crayfish in the future. The revised Alien Biological Law aims to strengthen countermeasures against alien species that may affect ecosystems.
What kinds of crayfish are there in Japan now? What are the different kinds of ways to distinguish? The illustrated book is as follows:
Species and identification methods of Japanese crayfish
■Individual characteristics and identification methods
Body length: 5 to 10 cm
Body color: brown, brown
Characteristics of shrimp claws: no blue-white pattern, no spines
Characteristics of the forehead: The shape of the head is triangular and there are no thorns
■An overview of Japanese crayfish
It is the only crayfish inherent in Japan. It is a small and medium-sized crayfish, about 4 cm in total length, and the individual is also very good. Because the habitat has become narrower and the number of individuals has decreased, it is now designated as two species that are endangered (species with an increased risk of extinction). Its habitat is in the tohoku region of Japan, as far as Hokkaido, and only survives isolated islands such as Okurjiri and Rebun Island.
I like beautiful fresh water such as spring water, but once the environment is damaged, it will disappear immediately, so the habitat is constantly decreasing. It takes about 5 years until the individual matures, and the number of spawns is about 50 eggs once a year, which is also the reason for the decrease in reproductive ability compared with crayfish of alien species.
Species and resolution methods of American crayfish
■Individual characteristics and identification methods
Body length: 10 to 15 cm
Body color: red
Characteristics of shrimp tongs: the overall color is bright red, with many spines
Characteristics of the forehead: there are many uneven thorns
■ An overview of American crayfish
The body length is about 8 to 12 cm, and the body color is mostly red or brown, which is its characteristic. It was brought to Japan in 1927 as a feed for bullfrogs. Eating aquatic weeds and preying on aquatic insects has an impact on Japan's pristine environment and ecosystem, becoming a threat to the ecology of the original species of Japanese crayfish, so it has been selected as 100 invasive alien species in Japan.
It should be noted that although it was previously designated as an alien organism, there are no breeding and marketing restrictions because no specific alien organisms are specified. Therefore, it is generally raised or bred at home. ---- the latest terms and conditions on May 11
Because the large scissors and the color of the body are beautiful, it is also a popular pet.
Crayfish species and resolution methods
■Individual characteristics and identification methods
Body length: 15cm~
Color: brown, brown
Characteristics of shrimp claws: the roots separated by scissors have a bluish-white pattern
Characteristics of the forehead: The shape of the head is three mountain shapes, with thorns at the roots
■A summary of crayfish
The length is the largest of the crayfish living in Japan. It was brought to Lake Mashu from the United States in 1930 as food, and has since spread around. In recent years, new stockings and individual movement have been restricted since 2006 due to the pre-existing Japanese crayfish and the high risk of victimization due to crayfish plague.
Wild crayfish have been confirmed in Hokkaido and may be banned due to their rapid reproduction. Some French restaurants in Japan can be used as an ingredient. Crayfish are also known as Kamchatka stone crabs, and the two species are the same species of crayfish. #日本立法禁售小龙虾 #