Amanzi olwandle lomhlaba agcwele izinhlobonhlobo zezakhamizi, ezahlukile ngokubukeka, ukwakheka okuthakazelisayo, namagama angajwayelekile. Kwezinye izimo, bekungukuvela okuhlukile kwezakhamuzi zasolwandle kanye nokufana kwazo nanoma yiziphi izinto, amathuluzi abenza bakwazi ukuthola amagama abo. Saw izinhlanzi ungomunye walabo abahlala olwandle.
Umsuka wezinhlobo nencazelo
Isithombe: Saw fish
I-sawfish, njengenhlobo, ihlala e-World Ocean esaphila kuze kube yilolu suku kusukela ku-Cretaceous. I-Sawfish ingeyesigaba sezinhlanzi ezi-cartilaginous, ezibandakanya oshaka, imisebe kanye nezikeyiti. Isici esivelele saleli qembu ukuthi izinhlanzi zalo ezinamathambo ezicubu zesigaxa, hhayi zamathambo. Kuleli qembu, i-sawfish ifakiwe emndenini wama-stingray, yize ingenayo iva esakhiweni sawo, ejwayelekile kubamele le subspecies.
Iqiniso elithakazelisayo: Ngaphambili, isithombe se-sawfish sasetshenziswa amasiko amaningi njengophawu lwesizwe, ngokwesibonelo, ama-Aztec.
ISawfish yaqanjwa ngegama elitholakala ekhanda lokukhula kwamathambo okubanzi ngamaphethelo amangelengele, afana nesaha elimbili emaceleni. Igama layo lesayensi yi-rostrum. Ezinye izinhlobo zoshaka nemisebe zinalesi sici. Kodwa-ke, igama elithi "sawfish" linamathele kuma-stingray, igama lawo eliphuma egameni lesiLatini elithi "Pristidae" lizwakala njenge "hole-hole ejwayelekile" noma "saw-nosed stingray".
Umehluko phakathi kwe-saw shark ne-sawfish, okuvame ukudideka ngayo ngisho nangabaphenyi abanolwazi kakhulu, yile:
- I-saw shark incane kakhulu kunenhlanzi yesarha. Owokuqala uvame ukufika kumamitha ayi-1.5 kuphela, owesibili - amamitha ayisithupha noma ngaphezulu;
- Izinhlobo ezihlukile zokuphela. Amaphiko oshaka be-sawnose achazwe ngokusobala futhi ahlukanisiwe nomzimba. Ngemisebe esikiwe, badlula ngokushelela emigqeni yomzimba;
- Ku-ray-nosed ray, ama-gill slits atholakala esiswini, kushaka, ezinhlangothini;
- Okubizwa ngokuthi "isaha" - ukukhula ekhanda - emisebeni enamakhaza enemba kunembile ngisho nangobubanzi, futhi ama-notches anomumo ofanayo. Koshaka, ukuphuma kuyancipha ngasekupheleni kwayo, kukhula intshebe ende kuwo, namazinyo anobukhulu obuhlukahlukene.
- Ukuhamba kukashaka kwenzeka ngenxa yomphetho womsila, lapho wenza ukunyakaza okucijile. I-sawmill ihamba ngokushelela, ngokunyakaza komzimba oku-wavy.
I-Sawfish ibhekwa njengengafundiwe kahle, ngakho-ke inani eliqondile lezinhlobo zalo alaziwa. Kodwa-ke, ososayensi bathole izinhlobo ezi-7 zemisebe yamasaha: okuluhlaza okotshani, i-Atlantic, iYurophu (yazo zonke ezinkulu kakhulu - kuze kufike kumamitha ayi-7 ubude), amazinyo amahle, i-Australia (noma iQueensland), i-Asia nekama.
Iqiniso elithakazelisayo: ISawfish iyadliwa, kepha ayithathwa njengeyentengiso. Lapho udoba, kufana nendebe, ngoba inyama yayo inzima kakhulu.
Yonke imisebe enekhala elihlukanisiwe ihlukaniswe ngamaqembu amabili, kuya ngosayizi wamanothi: kwelinye likhulu, futhi kwelinye - lincane. Emlonyeni, i-sawbore nayo inamazinyo amancane kakhulu kepha ayalingana. Ngokuya ngohlobo lwe-sawfish, zinamazinyo ukusuka ku-14 kuye ku-34 wamazinyo.
Iqiniso elijabulisayo: Isikhathi se-sawfish siphakeme kakhulu - i-sawfish ingaphila iminyaka engama-80.
Ukubukeka nezici
Isithombe: Inhlanzi ibone isilwane
Umzimba we-ray ekhalelwa ngesaha uvulekile, ufana nomzimba kashaka, kepha uthambile. Imbozwe ngezikali ze-placoid. Umbala womzimba we-sawfish kusuka ngemuva umnyama, u-olive-grey. Isisu sayo sikhanya, sicishe sibe mhlophe. Ingxenye yomsila cishe ayihlukanisiwe nomzimba we-sawbore, ngaphandle uhlangana nayo, njengokuqhubeka kwayo.
I-sawfish inempumulo eyisicaba enesici esiphumayo esimile njengonxande, ithinta kancane ukusuka phansi kuze kube sekugcineni, futhi izulazule ezinhlangothini zayo. Amazinyo okusaha empeleni yimiphetho eguquliwe embozwe esikalini. Ubude bokwakha, ngokusho kwemithombo ehlukahlukene, busuka ku-20% kuye ku-25% wobude besamba sebonke, okungaba ngamamitha ayi-1.2 kubantu abadala.
Ividiyo: Saw fish
Engxenyeni ye-ventral yomzimba wethambeka le-sawtooth, phambi kwe-fin ngayinye ye-pectoral, kunemigqa emibili yama-gill slits ngakwesokudla nangakwesobunxele. Amakhala ngesimo se-gill slits, esivame ukuphutha ngamehlo, nomlomo ovuleka ndawonye ufana kakhulu nobuso. Eqinisweni, amehlo e-sawmill amancane futhi atholakala engxenyeni yomzimba womzimba. Ngemuva kwabo kufafaza, ngosizo lwamanzi ampontshwa ngemigodi. Lokhu kuvumela imithambeka esika isaha ukuthi icishe inganyakazi ezansi.
I-sawtooth ray inamaphiko ayi-7 kuphela:
- lateral ezimbili ohlangothini ngalunye. Eziseduze kwekhanda zibanzi. Zikhule ndawonye nekhanda, zilithinta ngokushelela. Amaphiko amakhulu abaluleke kakhulu lapho umshini wokusaha amapulangwe untengantenga;
- dorsal ezimbili eziphakeme;
- din tail, okuthi kwabanye abantu ihlukaniswe ngama-lobes amabili. Ameva, atholakala esinqeni se-caudal emisebeni eminingi, akekho.
Imisebe ebonwayo inkulu kakhulu: ubude bayo, ngokusho kochthyologists, cishe amamitha ama-5, futhi kwesinye isikhathi kuze kube ngamamitha ayi-6-7.5. Isisindo esimaphakathi - 300-325 kg.
Ihlala kuphi inhlanzi yesarha?
Isithombe: Saw fish (sawed stingray)
Ama-sawmill anendawo yokuhlala ebanzi: imvamisa lawa angamanzi asezindaweni ezishisayo nakwezifudumele zazo zonke izilwandle, ngaphandle kwe-Arctic. Imvamisa zingatholakala engxenyeni esentshonalanga ye-Atlantic Ocean kusuka eBrazil kuye eFlorida, futhi kwesinye isikhathi oLwandle iMedithera.
Ichthyologists ichaza lokhu ngokufuduka kwezinkathi ezithile zonyaka: ehlobo, imisebe enamaphiko okusaha isuka emanzini aseningizimu iye enyakatho, kuthi ekwindla ibuyele eningizimu. EFlorida, zingabonakala emachwebeni nasemachwebeni cishe njalo phakathi nezinyanga ezifudumele. Iningi lezinhlobo zalo (ezinhlanu kweziyisikhombisa) zihlala ngasogwini lwase-Australia.
Uma sikhuluma ngendawo yezinhlobo ezithile zemisebe ekhalelwe ngesaha, khona-ke singakwazi ukuhlukanisa lokho:
- Amasauni aseYurophu atholakala ezindaweni ezishisayo nezishisayo zoLwandle i-Atlantic nasendaweni ye-Indo-Pacific, ngaphezu kwalokho, atholakala esifundeni esisogwini lwaseSantarem naseLake Nicaragua;
- ama-sawnuts aluhlaza ngokuvamile atholakala ezindaweni ezisogwini ezishisayo zesifunda se-Indo-Pacific;
- Ama-sawnuts ase-Atlantic atholakala ezindaweni ezishisayo nezishisayo zasePacific nase-Indian Ocean;
- ama-sawnuts anamazinyo amahle futhi ase-Asia atholakala ezingxenyeni ezisogwini ezishisayo zoLwandle lwaseNdiya nasePacific;
- I-Australia - emanzini asogwini e-Australia nasemifuleni yaleli zwekazi;
- ikama - oLwandle iMedithera, kanye nasezindaweni ezishisayo nasezindaweni ezishisayo zoLwandle i-Atlantic.
Ama-saw ray akhetha amanzi asogwini njengendawo yawo yokuhlala, ngakho-ke kunzima kakhulu ukuyithola olwandle oluvulekile lapho kusebenza khona. Kaningi, ziyabhukuda emanzini angajulile lapho izinga lamanzi liphansi. Ngakho-ke, i-dorsal fin enkulu ingabonakala ngaphezu kwamanzi.
I-sawmill, ihlangana olwandle namanzi ahlanzekile, kwesinye isikhathi ibhukuda ibe yimifula. E-Australia, uncamela ukuhlala emfuleni ngaso sonke isikhathi, ezizwa ekhululekile. AmaSawfish awawamukeli amanzi angcoliswe ngumuntu. I-Sawfish ivame ukukhetha imifula yokufakelwa, phansi kodaka, ulwelwe, inhlabathi enesihlabathi njengendawo yabo yokuhlala. Ingatholakala futhi eduze kwemikhumbi eshonile, amabhuloho, izizalo kanye nezinsika.
Idliwa yini inhlanzi yesarha?
Isithombe: iStingray fish saw
I-sawfish iyisilwane esidla ezinye, ngakho-ke idla izakhamuzi zamanzi olwandle. Imvamisa, idla izinambuzane ezingenamgogodla ezihlala esihlabathini nasodakeni olwandle: izinkalankala, imfanzi nezinye. Indawo yokusaha izingodo ithola ukudla kwayo ngokuxegisa inhlabathi engezansi ngamakhala ayo angajwayelekile, iyimbe, bese iyakudla.
Ngaphezu kwalokho, i-sawnose stingray incamela ukondla izinhlanzi ezincane ezinjenge-mullet kanye nabamele umndeni we-herring. Kulokhu, uvele angene esikoleni sezinhlanzi futhi isikhathi esithile aqale ukugoqa i-rostrum yakhe ezinhlangothini ezihlukile. Ngakho-ke, inhlanzi ikhubeka ezinqeni zayo, njenge-saber, bese iwela phansi. Lapho-ke umshini wokusaha amasondo uqoqa kancane kancane udle isisulu sawo. Kwesinye isikhathi imisebe yamasaha ibuye izingele izinhlanzi ezinkudlwana, zisebenzisa izinothi zazo erostini ukukhipha izingcezu zenyama kuzo. Lapho isikole sezinhlanzi sikhulu, maningi amathuba okuba stun noma ukuvimba izinhlanzi eziningi.
Okubizwa nge- "saw" nakho kusiza isaha ekufuneni inyamazane, njengoba inikezwe ngama-electroreceptor. Ngenxa yalokhu, i-sawtooth iyazwela ekuhambeni kwempilo yasolwandle, ibamba ukunyakaza okuncane kokudla okungenzeka okubhukuda emanzini noma okungcwaba ezansi. Lokhu kwenza kube nokwenzeka ukubona isithombe esinobukhulu obuthathu besikhala esizungezile noma emanzini anodaka nokusebenzisa ukukhula kwakho kuzo zonke izigaba zokuzingela. Amasaha aseSawula athola kalula isisulu sawo, ngisho nakolunye ungqimba lwamanzi.
Lokhu kufakazelwa ukuhlolwa okwenziwa emashini yamapulangwe. Imithombo yokuphuma kukagesi ebuthaka ibibekwe ezindaweni ezahlukahlukene. Kwakunalezi zindawo lapho i-ray ekhalelwa ngamasaha yahlasela khona ukuze ibambe inyamazane.
Izici zobuntu nendlela yokuphila
Isithombe: Saw Red Book Red
Ngenxa yokuthi isaha lingumzingeli, linolaka impela. Kubukeka kusabeka ikakhulukazi uma kuhlangene nokufana noshaka. Kodwa-ke kumuntu, akabeki ingozi; kunalokho, kunalokho ayinabungozi. Njengomthetho, lapho uhlangana nomuntu, i-ray-nosed ray izama ukufihla ngokushesha. Kodwa-ke, lapho eza, umuntu kufanele aqaphele ukuthi angamthukuthelisi. Ngaphandle kwalokho, lapho izwa ingozi, isaha ingasebenzisa i-rostrum yayo njengesivikelo futhi ilimaze umuntu.
Kwaba kanye kuphela lapho ukuhlaselwa kwesaha okusavuna kungavunyelwe kumuntu oqoshiwe. Kwenzeka ogwini oluseningizimu ye-Atlantic Ocean: walimaza umlenze womuntu. Isifanekiso sasincane, singaphansi kwemitha ubude. Amanye amacala ambalwa enzeka eGulf of Panama acasulwa. Ngaphezu kwalokho, kuneqiniso elingaqinisekisiwe lokuhlaselwa kwamapulangwe asogwini lwaseNdiya.
Kukhona umbono mayelana nobunzima be-sawfish ngenxa yobude bayo obude kakhulu. Kodwa-ke, empeleni, ijubane lokunyakaza kwakhe alilula. Lokhu kuyabonakala ebukhazikhazini bezenzo, indlela yokuzingela isisulu kanye nesisulu saso.
Isikhathi esiningi, imisebe esika isaha ikhetha ukuba olwandle. Zikhetha amanzi ane-turbid njengendawo yokuphumula nokuzingela. Amasaha abantu abadala akhetha ukujula okukhulu kakhulu - ama-40 m, lapho amawundlu awo engabhukudi. Esikhathini esiningi, usuku lwamapulangwe okucheba izingodo isikhathi sokuphumula, kepha bavuke ebusuku.
Isakhiwo senhlalo nokuzala
Isithombe: Saw fish
I-sawfish ihlukile kwezinye izinhlobo zezinhlanzi hhayi kuphela ekukhuleni kwayo okungavamile, kunokwehluka ezindabeni zokuzalisa. Ama-sawmails awabeki amaqanda, kepha azala ngokuwafaka ngaphakathi kowesifazane, njengoshaka nemisebe. Ukukhulelwa kwenzeka esibelethweni sowesifazane. Ukuthi amawundlu ahlala isikhathi esingakanani emzimbeni wowesifazane akwaziwa. Isibonelo, umshini wokusaha onamazinyo amahle ocwaningisiswe kahle unabantwana emzimbeni wowesifazane cishe izinyanga ezinhlanu.
Akukho ukuxhumeka okuphoqelekile. Kodwa-ke, kumaseli wezicubu axhunywe kumbungu, isikhuphasha sikhona, lapho i-sawtooth encane idla khona. Ngesikhathi sokukhula kombungu, imigoqo yawo ithambile, imbozwe ngokuphelele esikhunjeni. Lokhu kubekwa ngokwemvelo ukuze kungalimazi umama. Amazinyo athola ukuqina ngokuhamba kwesikhathi.
Iqiniso elithakazelisayo: Kunezinhlobo ze-saw-nosed stingray, abesifazane abangazala ngaphandle kokubamba iqhaza kwabesilisa, ngaleyo ndlela bagcwalise izinombolo zabo emvelweni. Ngaphezu kwalokho, lapho kuzalwa, ukubukeka kwabo kunekhophi eliqondile likamama.
Ama-saw blades azalwa, embozwe ulwelwesi lwesikhumba. Ngesinye isikhathi, i-sawfish yesifazane izala cishe amawundlu ayi-15-20. Ukuqala kokuthomba emidlwane kuza kancane, isikhathi sincike ekubeni kohlobo oluthile. Isibonelo, ezindaweni zokusaha zamazinyo ezincane, lesi sikhathi siyiminyaka eyi-10-12, ngokwesilinganiso, cishe iminyaka engama-20.
Uma sikhuluma ngokulingana kosayizi nokuvuthwa kwezocansi, ama-sawnuts amancane afundwe amancane eLake Nicaragua afinyelela kuwo ngobude bamamitha ama-3. Imininingwane yomjikelezo wokuzala wokugaya amapulangwe ayaziwa ngoba ayiqondakali kahle.
Saw izinhlanzi zezitha zemvelo
Isithombe: Saw saw fish fish
Izitha zemvelo ze-sawfish yizilwane ezincelisayo zasemanzini noshaka. Njengoba amanye amakinati ebhukuda emifuleni, futhi kunezinhlobo ezihlala zikhona, i-sawfish nayo inezitha zamanzi angenasawoti - izingwenya.
Ukuze ivikele kuzo, isawfish isebenzisa irostrum yayo ende. I-saw-snout stingray ivikela ngempumelelo, igijimela ezinhlangothini ezahlukile ngaleli thuluzi lokusika elibhobozayo. Ngaphezu kwalokho, ngosizo lwama-electoreceptors anikezwe amandla, atholakala ku-rostrum, i-sawtooth ingathola isithombe sobukhulu besikhala esizungezile. Lokhu kukuvumela ukuthi uziqondise ngisho nasemanzini anodaka ukuze uzivikele ezitheni, futhi lapho kufika ingozi, casha emkhakheni wabo wokubona. Ukuqaphela e-aquarium yemisebe enezinsalela eziqukethe nakho kukhombisa ukusetshenziswa kwe "saw" yabo ukuzivikela.
Ososayensi base-Australia University of Newcastle, ngenkathi befunda indlela yokusebenzisa irostrum, bathole omunye umsebenzi osetshenziswa ngamasaha ukuvikela ezitheni. Ngale njongo, amamodeli we-3D wemisebe esikiwe adalwa, ababa yingxenye yokulingisa kwekhompyutha.
Ngesikhathi kwenziwa ucwaningo, kutholakale ukuthi isaha, lapho lihamba, lisika amanzi ngothango lwalo, njengommese, lenza ukunyakaza okushelelayo ngaphandle kokudlidliza kanye nama-eddies ashubile. Lo msebenzi ukuvumela ukuthi uhambe emanzini ungabonwa izitha zakho kanye nempango, enganquma indawo yayo ngokudlidliza kwamanzi.
Inani labantu kanye nesimo sezinhlobo
Isithombe: Big Saw Fish
Phambilini, ngasekupheleni kwekhulu le-19 - ekuqaleni kwekhulu lama-20, inani le-sawfish lalisabalele, ngakho-ke akubanga nzima ukuhlangana nabamele lolu hlobo lwemisebe. Ubufakazi balokhu ngumbiko womdobi ngasekupheleni kweminyaka yama-1800 ukuthi wabamba cishe abantu abangama-300 ngesikhathi esisodwa sokudoba ngasogwini lwaseFlorida. Futhi, abanye abadobi bathi babona amakinsawusi anobukhulu obuhlukahlukene emanzini asogwini engxenyeni esentshonalanga yenhlonhlo.
Azikho izifundo ezilinganise inani le-sawfish ebelingashicilelwa ngalesi sikhathi. Kodwa-ke, ukwehla kwesibalo sabasiki bamapulangwe sekubhaliwe. Kukholakala ukuthi lokhu kungenxa yokudoba ngenhloso yokwenza inzuzo, okungukuthi ukusetshenziswa kwezimpahla zokudoba: amanetha, ama-trawls kanye nolwandle. I-Sawfish kulula kakhulu ukuyingenela kuzo, ngenxa yokuma kwayo nohlaka olude. Iningi lamasahaha abanjiwe aminyaniswa noma abulawa.
Ama-sawmill anenani eliphansi lokuhweba, ngoba inyama yawo ayisetshenziswanga ukudla kwabantu ngenxa yesakhiwo sayo esimahhadla. Phambilini, babebanjwa ngenxa yamaphiko okwakwenziwa ngawo isobho, futhi izingxenye zabo nazo zazivamile ekuhwebeni ngezinto ezingavamile. Ngaphezu kwalokho, amafutha wesibindi ayedingeka emithini yesintu. I-sawtooth rostrum yiyona ebaluleke kakhulu: izindleko zayo zingaphezu kuka- $ 1000.
Ingxenye yesibili yekhulu lama-20 yabona ukwehla okuphawulekayo kwenani lamapulangwe okucheba amatshe eFlorida. Lokhu kwenzeke ngokunembile ngenxa yokubamba kwabo kanye namakhono amancane okuzala. Ngakho-ke, kusukela ngo-1992, ukubanjwa kwabo kwavinjelwa eFlorida. Ngo-Ephreli 1, 2003, i-sawfish yabonwa njengesilwane esisengozini yokuqothuka e-United States, kwathi ngemuva kwesikhashana yafakwa kwi-International Red Book. Ngaphezu kokudoba, isizathu salokhu ukungcoliswa komuntu kwamanzi asogwini, okwaholela eqinisweni lokuthi umshini wokusaha izingodo awunakuhlala kuwo.
Iqiniso elithakazelisayo: Izinombolo zeSawfish zilinyazwe ukuzingela ngokungemthetho. Ngalesi sizathu, kanye nokuwohloka kwesimo semvelo yi-International Union for Conservation of Nature, imisebe ye-saw-nosed ray yaklonyeliswa ngesimo "Sokushabalala".
Imvelo uqobo lwayo kanye nendlela yayo yokuziphendukela kwemvelo - i-parthenogenesis (noma ukuzala kwezintombi nto) - kufakwe isixazululo enkingeni yokusongela ukuqothulwa kwezinhlobo ze-sawmouth. Lesi siphetho senziwe ososayensi baseStony Brook University yaseNew York. Bathola amacala e-parthenogenesis ku-sawfish enamazinyo amancane, okuyinhlobo esengozini yokuqothulwa.
Esikhathini esivela ku-2004 kuya ku-2013, ososayensi babheka iqembu lenhlanzi enamazinyo amancane, eyayitholakala ngasogwini lwaseCharlotte Harbour. Ngenxa yalokhu, kwakhonjwa amacala ayi-7 okuzala kwezintombi, okuyi-3% yenani eliphelele lamasaha okuvuthwa kwezocansi kuleli qembu.
Wabona unogada wezinhlanzi
Isithombe: Wabona izinhlanzi ezisencwadini ebomvu
Ngenxa yokwehla okukhulu kwabantu kusukela ngo-1992, ukuthunjwa kwemisebe yamasaha akuvunyelwe eFlorida. Ngokwesimo sezilwane ezisengozini yokuqothulwa esanikezwa e-United States ngo-Ephreli 1, 2003, zingaphansi kokuvikelwa nguhulumeni. Kusukela ngo-2007, bekuvinjelwe umhlaba wonke ukuhweba ngezitho zomzimba zemisebe yamasaha, okungukuthi amaphiko, irostamu, amazinyo abo, isikhumba, inyama nezitho zangaphakathi.
Njengamanje, i-sawfish ibhalwe ku-International Red Book. Ngakho-ke amasaha kufanele avikelwe ngokuqinile. Ukuze kugcinwe lezi zinhlobo, kuvunyelwe kuphela ukubanjwa kwamapulangwe amazinyo amancane, agcinwa ezindaweni zasemanzini. Ku-2018, i-EDGE ibeke izinhlobo zezilwane ezisengozini kakhulu phakathi kwezindawo ezihlukaniswe kakhulu ngokuziphendukela kwemvelo. I-Sawfish yafika kuqala kulolu hlu.
Maqondana nalokhu, ososayensi baphakamise lezi zinyathelo ezilandelayo zokuvikela indawo yokusaha izingodo:
- ukusetshenziswa kokuvinjelwa kwe-CITES ("Isivumelwano Sokuhwebelana Kwamazwe Ngamazwe Ngezilwane Ezisengozini Yokushabalala Yezilwane Nezilwane Zasendle");
- ukunciphisa inani lemisebe ebanjiwe engahlosile;
- ukunakekelwa nokuvuselelwa kwezindawo zemvelo zamapulangwe
Kwezinye izimo, ukudoba ungahlosile kuhlotshaniswa nokuzingelwa kwamapulangwe okuzingela inyamazane. Ngoba, ngokuyijaha, isawudo ingawela emanetheni okudoba. Ngalesi sizathu, ososayensi abavela e-Australia University of Queensland, eholwa nguBarbara Wueringer, bacwaninga inqubo yokuzingela kwabo, bezama ukuthola indlela yokubavimbela ukuthi bangaweli emanetheni abadobi.
I-sawfish, njengenhlobo, ihlala e-World Ocean esaphila kuze kube yilolu suku kusukela ku-Cretaceous. Kujwayelekile impela phambilini, eminyakeni engaba yikhulu edlule, okwamanje inesimo sohlobo olusengozini yokuqothulwa. Isizathu salokhu umuntu. Noma i-saw bit ingenabungozi kubantu futhi ingeyona inhlanzi ethengiswayo, ibanjelwa ukuthengisa ezinye izingxenye, futhi ingcolisa nezindawo zayo zokuhlala.
Njengamanje, i-ray-nosed ray izongena kwi-International Red Book, ngakho-ke ingaphansi kokuvikelwa okuqinile. Ngaphezu kwalokho, imvelo uqobo lwayo kanye nendlela yayo yokuziphendukela kwemvelo - i-parthenogenesis - yangena esixazululweni senkinga yosongo lokuqothulwa kohlobo lwe-sawmouth. Saw izinhlanzi unamathuba onke okulondoloza nokuvuselela abantu.
Usuku lokushicilelwa: 03/20/2019
Usuku lokubuyekeza: 09/18/2019 ngo-20: 50
