Te Kounga Wai Pai mō te Whakatipu Ika Tilapia
Ko te Tilapia (Oreochromis niloticus) tētahi o ngā ika wai māori rongonui i roto i te mahi ahuwhenua ika, tae noa ki te ao whānui. Nā tōna tere tipu, tōna ātete pai ki ngā mate, me tōna ngāwari ki te urutau, tōna rongonuitanga. He mea nui te kounga wai pai mō te angitu o te whakatipu tilapia. Ka matapakihia e tēnei tuhinga ngā tawhā kounga wai nui me pēhea te whakapai ake i aua tawhā.
1. Te pāmahana wai
He mea nui te pāmahana wai e pā ana ki te tipu me te hauora o te tilapia. Ko te pāmahana pai mō te whakatipu tilapia kei waenganui i te 25°C ki te 30°C. I tēnei pāmahana, ka tino pai te tere tipu o te tilapia, ā, he iti ake ngā taumata ahotea.
– Ngā Pānga o te Pāmahana Iti: I ngā pāmahana i raro iho i te 20°C, ka ngawari ake te pāngia o ngā tilapia e te mate, ā, ka heke iho tō rātou ātete ki te pangia. Ka puhoi hoki te tere o te pākia o te tinana, ka whakaiti i te hiahia kai me te tipu.
– Te Pānga o te Pāmahana Nui: Ki te neke ake te pāmahana o te wai i te 32°C, ahakoa kei te tupu tonu, ka taea e te tere tino tiketike o te pākia o te tinana te whakararu i te ahotea me te whakanui ake i te mōrearea o te mate nā te kore o te hāora rewa.
2. pH wai
Ko te pH wai he ine i te waikawa, i te kawakore rānei o te wai, ā, ko te uara tino pai mō te tilapia kei waenga i te 6,5 ki te 8,5. E kiia ana he pH tino pai tēnei nā te mea e tata ana ki ngā āhuatanga tūturu o te nohoanga o te tilapia.
– pH iti (waikawa): Ki te heke te pH o te wai i raro i te 6, ka puta te waikawa, ka kino pea ngā pihanga me te ahotea. Ka taea hoki e tēnei āhua waikawa te āwhina i te tipu o ngā huakita kino.
– Te pH teitei (Pūtake): Mā te pH neke atu i te 9 ka pāngia te ika e te alkalosis, ka kore ai e taea e ia te whakataurite i ngā electrolytes, ā, ka whakararuraru i ētahi atu tukanga ā-tinana.
3. Hāora Whakarewa
He mea nui te hāora rewa mō te manawa o ngā ika me ētahi atu moroiti i roto i ngā pūnaha rauropi wai. Me nui te hāora rewa mō ngā tilapia hei oranga tonutanga. Ko te taumata hāora pai rawa atu he nui ake i te 5 mg/L.
– Te Kore o te Hāora: Ka pāngia ngā ika e te ahotea nui mēnā ka iti iho i te 3 mg/L te hāora, ā, ka mate pea rātou. Ko te iti o te hāora ka puta mai i te nui rawa o te taupori, te nui o ngā matū waro wairewa, te tino teitei rānei o te pāmahana wai.
– Te nui rawa o te hāora: Ahakoa he onge, ka taea e te nui rawa o te hāora te whakakī i te wai, ā, ka hua ake he mate mirumiru hau e kino ana ki ngā pihanga me ngā kiko tinana o te ika.
4. Haukini, Nitrite, me te Nitrate
Ko te haukini, te nitrite, me te nitrate he hua o te pirau o ngā mea rauropi me te tukunga o ngā ika. Me aro turuki tonu te kukū o ēnei matū e toru nā te mea ka pā kino ki te tilapia.
– Haukini (NH3/NH4+): Me pupuri te haukini i raro i te 0,5 mg/L. Ka taea e te haukini nui te whakararuraru i ngā pihanga o te tinana, ā, ka whakaiti i te hāora i roto i te toto.
– Nitrite (NO2-): Me iti iho i te 0,1 mg/L te nitrite. Ka puta te methemoglobinemia (mate toto parauri) i te nitrite teitei, ka whakaiti i te kaha o te ika ki te kawe hāora.
– Nitrate (NO3-): He iti ake te paitini o te nitrate i te haukini me te nitrite, engari ko ngā taumata pai rawa atu ka noho tonu i raro i te 50 mg/L hei karo i ngā pānga ahotea ki ngā ika.
5. Te Pakeketanga o te Wai me te Kawakore
Ko te pakeke o te wai me te kawakore ngā tawhā e rua e tohu ana i te nui o ngā kohuke i roto i te wai.
– Te Pakeketanga o te Wai: Me noho te pakeketanga katoa (dGH) ki te awhe 50-150 ppm. Ka taea e te tilapia te ora i ngā taumata pakeketanga rerekē, engari ka tupu pai i te pakeketanga taurite.
– Te kawakore: Ko te kawakore tino pai (kH) kei te 100-200 ppm. Mā te kawakore tika ka tau te pH, ā, ka ārai i ngā huringa ohorere o te waikawa o te wai.
6. Te Pūriri me ngā Matūriki Whakatārewatia
Ko te wai pai mō te tilapia me mārama, kia uru ai te mārama ki te wai mō te whakaahua o ngā tipu wai, kia mau tonu ai te ataahua o te taiao whakatipu. Ko te nui o te paru, nā ngā matūriki iri pērā i te paru, te para, te mea rauropi rānei, ehara i te mea ka ārai noa i te mārama, engari ka kino anō hoki ki ngā pihanga o te ika.
– Te Whakahaere i te Pūngāwerewere: Mā te whakamahi i ngā pūnaha tātari ā-ringa me ngā pūnaha tātari koiora ka āwhina i te pupuri i te ma o te wai. He mea nui anō hoki te whakarite kia ma, kia kore e poke te puna wai i mua i te whakaurunga ki te pūnaha whakatipu.
7. Te Whakahaere Kounga Wai
He mea nui te aroturuki i te kounga o te wai i ia wā, kia mōhio ai kei roto ngā tawhā katoa i ngā awhe e tika ana. Mā te hangarau hou ka taea te whakamahi i ngā pūoko aunoa me ngā pūmanawa hei aroturuki me te whakahaere i te kounga o te wai i te wā tonu.
– Whakamātautau Ā-ringa: Me wātea tonu ngā taputapu whakamātautau ā-ringa mō ngā tawhā nui pēnei i te pH, te pāmahana, te hāora rewa, me ngā taumata haukini, ā, me whakamahi tonu.
– Pūnaha Whakapūngao: Mā te whakapūngao tonu ka pai ake te kounga o te hāora rewa i roto i te wai. He mahi noa te whakamahi i te papu hau, i te pūngao rānei i roto i te puna, ā, kua kitea tōna whai huatanga.
– Te Whakahaere Para: Ka taea te whakahaere i te tukanga pirau o ngā rauemi rauropi mā te whakawhiti wai auau, te pūnaha tātari pai, me te whakamahi i ngā tātari koiora hei whakaiti i ngā taumata haukini, nitrite, me te nitrate.
Whakamutunga
Ko te kounga o te wai te tūāpapa o te mahi pāmu tilapia angitu. Mā te māramatanga hōhonu ki ngā tawhā kounga wai pērā i te pāmahana, te pH, te hāora rewa, me ngā kukū paitini, me te whakahaere tika, ka taea e ngā kaimahi pāmu te waihanga i tētahi taiao tino pai mō te tipu tilapia. Mā te haumi ki te hangarau aroturuki me te whakahaere kounga wai ka puta he hua nui, e pā ana ki te hua me te hauora o ngā ika.
