Mofuta o le mong ho tse supileng oa lishaka le mahlaseli a tebileng a kotsing ea ho fela ka lebaka la ho tšoasa litlhapi ho feta tekano, ho latela lilemo tse robeli tse ncha. thuto e lokollotsoe kajeno koranteng Science.
Haholo-holo, liphuputso li fumane hore lishaka le mahlaseli li tšoasoa e le ho tšoasoa ka tšohanyetso ho tšoasa litlhapi tse tobisitseng mefuta e meng ea bohlokoa khoebong. Leha ho le joalo, li bolokoa ka lebaka la boleng ba oli le nama ea tsona. Sena, se kopane le keketseho ea morao-rao ea lefats'e khoebong ea oli ea sebete sa shark, se bakile ho fokotseha ho hoholo ha baahi.
“Hoo e ka bang halofo ea lishaka tsa lefatše e fumanoa ka tlaase ho limithara tse 200, ka tlaase ho moo khanya ea letsatsi e fihlang leoatleng,” ho bolela Nicholas Dulvy, Moprofesa ea Hlomphehang oa SFU oa Marine Biodiversity and Conservation.
Lekhetlo la pele ha ba bona khanya ea letsatsi ke ha ba huleloa mokatong oa seketsoana sa ho tšoasa litlhapi.”
Tlhahlobo ena e ncha ea Dulvy e ile ea lekola mefuta e fetang 500 ea lishaka le mahlaseli 'me ea kenyelletsa litsebi tse fetang 300 tse tsoang lefats'eng ka bophara. E ile ea fumana hore mefuta e ka bang 60 e kotsing ea ho fela ka lebaka la ho tšoasa litlhapi ho tlōla tekano, ho latela litekanyetso tsa International Union for Conservation of Nature (IUCN) Red List of Threatened Species.
"Ha maoatle a phahameng le metsi a lebopo a ntse a fokotseha linaheng tse ngata tsa lefats'e, re khothaletsa batšoasi ba litlhapi ho ts'oasa lihlapi kantle ho naha 'me ho se ho khoneha ho ts'oasa lihlapi ho fihlela botebo ba k'hilomithara," Dulvy o re.
Lishaka le mahlaseli a metsi ke tse ling tsa liphoofolo tse phelang metsing tse utloang bohloko ka ho fetesisa ka lebaka la nako e telele ea ho phela le ho ba le bana. Li na le potoloho ea bophelo e tšoanang le ea liphoofolo tse anyesang tsa metsing tse kang maruarua le li-walrus, tseo pele li neng li sebelisoa hampe bakeng sa oli ea tsona 'me hona joale li sirelelitsoe haholo.
Dulvy o re: "Lishaka le mahlaseli a mangata a botebong ba metsi a ka mamella likhatello tse nyane haholo tsa ho tšoasa litlhapi. “Mefuta e meng e ka ’na ea nka lilemo tse 30 kapa ho feta hore e hōle, ’me mohlomong ho ka nka lilemo tse 150 tabeng ea Shark ea Greenland, ’me e hlahisa malinyane a 12 feela bophelong bohle ba eona.”
Lishaka le mahlaseli li boloka thabo ea tsona ka ho ba le sebete se mafura, empa mafura ana ke a bohlokoa haholo. E sebelisoa haholo litlolong, litlatsetso tsa limatlafatsi le meriana, joalo ka liente. Ho boetse ho bile le keketseho ea ho tšoasa litlhapi ka skate ho tšehetsa tlhoko ea skate e lomositsoeng, e leng sejo se monate sa setso sa Korea.
“Ho bile le katleho e kholo taolong ea khoebo ea mapheo a lishaka. Hona joale re hloka ho lebisa tlhokomelo ea rona ho laola khoebo ea machaba ea oli ea sebete. "
Ntle le ho laola khoebo ea machaba ea oli ea sebete sa shark, thuto e boetse e lumellana le ts'ebetso ea lefats'e ea ho sireletsa karolo ea 30 lekholong ea maoatle a lefatše ka 2030. Ho sireletsa karolo ea 30 lekholong ea leoatle le tebileng (limithara tse 200 ho isa ho tse 2,000) ho tla fana ka karolo ea 80 lekholong. tshireletso e sa fellang ya mefuta ho pholletsa le mefuta ya tsona. Thibelo ea lefats'e ea ho tšoasa litlhapi ka tlase ho limithara tse 800 e tla fana ka sebaka sa 30% sa setšabelo se otlolohileng bakeng sa karolo ea boraro ea lishaka le mahlaseli a tebileng a tebileng.
Global Shark Trends Project ke tšebelisano 'moho ea Univesithi ea Simon Fraser, IUCN Shark Specialist Group, James Cook University, le Georgia Aquarium, e thehiloeng ka tšehetso ea Letlole la Paballo ea Lishaka.
E ngotsoe ke Jeff Hodson
Source: SFU
