Uphando olutsha lubonisa ukuba inani leentlanzi ezibanjiweyo Ukusetyenziswa kokuphindwe kabini kunikwe ingxelo, enokusikhokelela kwingxaki enkulu kunokuba besinokucinga ekuqaleni.
Phakathi kowe-1950 nowama-2010, i-FAO, ulijongele phantsi inani elipheleleyo yeentlanzi ezibanjiswe kulwandlekazi lwesiqingatha, ngokutsho kwencwadi entsha ebizwa ngokuba yiGlobal Atlas Of Marine Fisheries, nesiphumo seminyaka elishumi yophando.
Endaweni yokubambisa iintlanzi kufikelela kwincopho ye Iitoni ezizizigidi ezingama-86 ngo-1996, inani ngoku kungangezigidi ezili-130 zeetoni. Oko kuthetha ukwehla okunzima kumanani ezi ntlobo zezinto eziphilayo ukusukela phakathi kwiminyaka yoo-90, nangaphezulu kokuba iingcali zesayensi bezicinga.
Ngapha koko, ingaphezulu kathathu ezantsi kunokuba bekuqikelelwe, kuba kuncitshisiwe i-1,2 yezigidi zeetoni ekubambeni unyaka nonyaka odlulileyo.
UDaniel Pauly, umphenyi oyintloko kwiYunivesithi yaseBritish Columbia, kunye nomnye wababhali bale ncwadi ikhankanyiweyo ngasentla, uthi ukuba ukubanjwa kuyaqhubeka ukwehla, into eyenzekayo kukuba siya kuba neentlanzi ezimbalwa nolwandle. Kwaye ngaphezulu, sinotshintsho lwemozulu, eyenza izinto zibe mandundu ngakumbi, ngakumbi kwiindawo ezitshisayo.
Into eyenzekayo ikwayiloo nto zintathu iindidi zokuloba okuncinci ezo zingakhange zibandakanywe kwezi ngxelo kumashumi eminyaka adlulileyo, ezinje ngeengxelo zokutya, ezolonwabo kunye nezobugcisa. Ngokushiya zonke ezo zinto, njengokuloba okusemthethweni, okuthatha ibe nye kwiintlanzi ezintlanu ezibanjiweyo, uye wakuphazamisa kakhulu ukuchaneka kokubanjiweyo kwakho.
Enye ingxaki kukuba iilwandle zomhlaba wonke bathathe uninzi lobushushu obugqithisileyo yeatmosfera kwiminyaka yakutshanje. Iintlanzi kwakufuneka zihambe ngeepali ngaxeshanye ne Utshintsho lwemozulu luyaqhubeka ukubetha, eshiya amazwe akweleenjiko ngaphandle kokutya.
Esinye seziphumo ezinokubakho kukuba mayibe ibhalansi kwakhona ubungakanani beentlanzi elwandle ezinciphisa ukubanjiswa, ezinokufezekisa iyantlukwano enkulu, ukuxhathisa ngokuchaseneyo notshintsho kwanokutshintsha kwemozulu.