Izinhlanzi, njengoba zijula, njengomthetho, aziboni abadobi, kodwa zizwa kahle ukuthi abadobi bakhuluma kanjani futhi bahambe endaweni eseduze kwamanzi. Ukuze uzwe, izinhlanzi zinendlebe yangaphakathi nomugqa osemaceleni.
Amaza omsindo asakazeka ngokuphelele emanzini, ngakho-ke noma yikuphi ukuhwashaza nokunyakaza okuxakile ogwini kufinyelela ngokushesha ezinhlanzini. Ufika echibini bese ushaya kakhulu isicabha semoto, ungathusa izinhlanzi, futhi izosuka ogwini. Njengoba kunikezwe ukuthi ukufika echibini kuhambisana nokuzijabulisa okukhulu, akufanele uthembele ekudobeni okuhle, okukhiqizayo. Izinhlanzi ezinkulu, abadobi abavame ukufuna ukuzibona njengendondo eyinhloko, baqaphe kakhulu.
Izinhlanzi zasemanzini ahlanzekile zihlukaniswe ngamaqembu amabili:
- izinhlanzi ezinokuzwa okuhle kakhulu: i-carp, i-tench, i-roach;
- izinhlanzi ngokuzwa kahle: i-peke, i-pike.
Izinhlanzi zizwa kanjani?
Ingaphakathi lendlebe yenhlanzi lixhunywe esinyeni sokubhukuda, esisebenza njenge-resonator ethulisa ukundindizela komsindo. Ukudlidliza okukhulisiwe kudluliselwa endlebeni yangaphakathi, ngenxa yokuthi inhlanzi izwa kahle. Indlebe yomuntu iyakwazi ukuzwa umsindo ebangeni elisuka ku-20Hz ukuya ku-20kHz, kuyilapho ububanzi bomsindo wezinhlanzi buncipha futhi bungaphakathi kuka-5Hz-2kHz. Singasho ukuthi inhlanzi izwa kabi kunomuntu, izikhathi ezingaba ngu-10, futhi ububanzi bayo bomsindo oyinhloko butholakala ngaphakathi kwamagagasi omsindo aphansi.
Ngakho-ke, izinhlanzi emanzini zikwazi ukuzwa ukuhwashaza okuncane, ikakhulukazi ukuhamba ogwini noma ukushaya phansi. Ngokuyinhloko, lezi ziyi-carp ne-roach, ngakho-ke, uma uhamba nge-carp noma i-roach, lesi sici kufanele sicatshangelwe.
Izinhlanzi ezidla ezinye zinesakhiwo esihluke kancane semishini yokuzwa: azinakho ukuxhumana phakathi kwendlebe yangaphakathi kanye nesinye somoya. Bathembela kakhulu ekuboneni kwabo kunasekuzweni kwabo, njengoba bengakwazi ukuzwa amaza omsindo angaphezu kuka-500 Hz.
Umsindo owedlulele echibini uthinta kakhulu ukuziphatha kwezinhlanzi ezizwa kahle. Ngaphansi kwezimo ezinjalo, angase ayeke ukuhambahamba echibini efuna ukudla noma aphazamise ukuzala. Ngesikhathi esifanayo, inhlanzi iyakwazi ukubamba ngekhanda imisindo futhi iyihlanganise nezenzakalo. Ngenkathi benza ucwaningo, ososayensi bathola ukuthi umsindo wawunomthelela onamandla kakhulu ku-carp futhi, ezimweni ezinjalo, wayeka ukudla, kuyilapho i-pike iqhubeka nokuzingela, inganaki umsindo.
Izitho zokuzwa ezinhlanzini
Inhlanzi inezindlebe ezimbili ezitholakala ngemuva kogebhezi lwekhanda. Umsebenzi wezindlebe zezinhlanzi awukona nje ukubona ukudlidliza komsindo, kodwa futhi ukhonza njengezitho ezilinganayo zezinhlanzi. Ngesikhathi esifanayo, indlebe yezinhlanzi, ngokungafani nabantu, ayiphumi. Ukudlidliza komsindo kudluliselwa endlebeni ngama-fat receptors, athatha amaza aphansi-frequency akhiqizwa ngenxa yokuhamba kwezinhlanzi emanzini, kanye nemisindo engaphandle. Ukungena ebuchosheni bezinhlanzi, ukudlidliza komsindo kuqhathaniswa futhi, uma kuvela abantu bangaphandle phakathi kwabo, bayagqama, futhi izinhlanzi ziqala ukusabela kuzo.
Ngenxa yokuthi inhlanzi inemigqa emibili ehlangothini nezindlebe ezimbili, iyakwazi ukunquma isiqondiso ngokuphathelene nemisindo eyenziwe. Ngemva kokunquma ukuthi umsindo oyingozi uya ngakuphi, angakwazi ukucasha ngesikhathi.
Ngokuhamba kwesikhathi, inhlanzi ijwayela imisindo engaphandle engayisongeli, kodwa lapho kuvela imisindo engaziwa kuyo, ingase isuke kule ndawo futhi kungase kungenzeki ukudoba.