Izinhlanzi nezinye izilwane zasemanzini zakha iqembu elikhulu lezilwane ezibulawelwa ukudla, nokho ngokuvamile yizo ezinganakwa kakhulu. Izigidigidi ziyabanjwa noma zilinywe unyaka ngamunye, ezedlula kude izinombolo zezilwane zasemhlabeni ezixhashazwayo kwezolimo. Naphezu kobufakazi obandayo besayensi bokuthi izinhlanzi zizwa ubuhlungu, ukucindezeleka, nokwesaba, ukuhlupheka kwazo akunakwa noma azinakwa. I-Industrial aquaculture, evame ukubizwa ngokuthi ukufuywa kwezinhlanzi, ifaka izinhlanzi ezibayeni noma emakhejini aminyene lapho izifo, ama-parasites, nezinga eliphansi lamanzi lidlangile. Izinga lokufa liphezulu, futhi labo abasindayo babekezelela izimpilo zokuvalelwa, bencishwa ikhono lokubhukuda ngokukhululeka noma ukuveza ukuziphatha kwemvelo.
Izindlela ezisetshenziswayo ukubamba kanye nokubulala izilwane zasemanzini ngokuvamile zinonya ngokwedlulele futhi zithatha isikhathi eside. Izinhlanzi ezibanjiwe zasendle zingase ziminyaniswe kancane ezitezini, zichotshozwe ngaphansi kwamanetha asindayo, noma zife ngenxa yokuwohloka njengoba zidonswa emanzini ajulile. Izinhlanzi ezifuywayo zivame ukuhlatshwa ngaphandle kokumangalisa, zishiywe ukuze ziphefumule emoyeni noma eqhweni. Ngaphandle kwezinhlanzi, izigidigidi zama-crustaceans nama-mollusk—njengezimfanzi, izinkalankala, nezingwane—nazo zingenwa imikhuba ebangela ubuhlungu obukhulu, naphezu kokuqashelwa okwandayo kwemizwa yazo.
Umthelela wemvelo wokudotshwa kwezimboni kanye nokufuywa kwezilwane zasemanzini ulimaza ngokufanayo. Ukudoba ngokweqile kusongela zonke izimiso zemvelo, kuyilapho amapulazi ezinhlanzi anengxenye ekungcoleni kwamanzi, ekucekeleni phansi kwezindawo ezihlala kuzo, nasekusakazekeni kwezifo kubantu basendle. Ngokuhlola usizi lwezinhlanzi nezilwane zasemanzini, lesi sigaba sinikeza ukukhanya ezindlekweni ezifihlekile zokusetshenziswa kwezilwane zasolwandle, sikhuthaza ukucatshangelwa ngokujulile kwemiphumela yokuziphatha, imvelo, kanye nezempilo yokuphatha lezi zidalwa ezizwelayo njengemithombo engasetshenziswa.
Ulwandle luhlanganisa ngaphezulu kwama-70% omhlaba futhi luyikhaya lokuhlekisa ngempilo yasemanzini. Eminyakeni yamuva nje, isidingo sokudla kwasolwandle siholele ekukhuphukeni kwamapulazi olwandle namapulazi ezinhlanzi njengendlela yokudoba okuqhubekayo. Lawa mapulazi, abizwa nangokuthi ama-aquaculture, ajwayele ukubonwa njengesixazululo sokudoba ngokweqile nendlela yokuhlangabezana nesidingo esikhulayo sokudla kwasolwandle. Kodwa-ke, ngaphansi kobuso kukhona iqiniso elimnyama lomthelela lawa mapulazi anawo endalini yemvelo yasemanzini. Ngenkathi zingabonakala njengesixazululo ebusweni, iqiniso ukuthi amapulazi olwandle nama-fish angaba nemiphumela emibi emvelweni nasezilwaneni ezibiza ulwandle ekhaya. Kulesi sihloko, sizokwehla ngokujulile emhlabeni wolwandle kanye nokulima izinhlanzi futhi siveze imiphumela efihliwe esisongela imvelo yethu engaphansi kwamanzi. Ukusuka ekusetshenzisweni kwama-antibiotic nama-pesticides ku ...