Hajer

Hajer
Hajer (Pleurotremi) er en orden af tværmunde. De er bruskfisk med en langstrakt krop. Der findes 354 forskellige hajarter i hele verden, fra cigarhajen (på størrelse med en god Havannacigar, deraf navnet) til hvalhajen, der med sine op til 12-14 meter er den suverænt største. Den er ikke spor farlig, for den lever af plankton, krill og småfisk ligesom de store bardehvaler. I Danmark har vi 9-11 hajarter. Den mindste er den småplettede rødhaj på op til 60-80 cm., den største er brugden, som med sine op til 10 meter hører til blandt verdens allerstørste. Ligesom hvalhajen er den en fredelig planktonæder. Vi har ingen hajer, som er farlige for mennesker i Danmark. Det nærmeste vi kommer er måske blåhajen, som kan trække ind i Nordsøen. Den findes til gengæld så langt til havs, at vi ikke møder den, når vi er på stranden .

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