Diferentes tipos de substratos de biofiltro na larvicultura de til?pia do Nilo.
| Autor: | Caldeira, Cristiane Quit?ria |
|---|---|
| Jazyk: | portugalština |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Repositório Institucional da UFVJMUniversidade Federal dos Vales do Jequitinhonha e MucuriUFVJM. |
| Druh dokumentu: | masterThesis |
| Popis: | Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-10-26T16:38:31Z No. of bitstreams: 2 cristiane_quiteria_caldeira.pdf: 12476477 bytes, checksum: e92c1b51c3011ca2f635955ffb2079b9 (MD5) license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-10-26T16:39:25Z (GMT) No. of bitstreams: 2 cristiane_quiteria_caldeira.pdf: 12476477 bytes, checksum: e92c1b51c3011ca2f635955ffb2079b9 (MD5) license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) Made available in DSpace on 2015-10-26T16:39:25Z (GMT). No. of bitstreams: 2 cristiane_quiteria_caldeira.pdf: 12476477 bytes, checksum: e92c1b51c3011ca2f635955ffb2079b9 (MD5) license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) Previous issue date: 2011 Objetivou-se neste trabalho, comparar diferentes substratos de biofiltro na recircula??o de ?gua na larvicultura de til?pia do Nilo (Oreochromis niloticus). Foram utilizadas 1200 larvas de uma mesma desova, com 10 dias ap?s a eclos?o, comprimento inicial de 11,58 mm e peso m?dio de 189 mg distribuidas em 20 aqu?rios com 6 L de ?gua (60 larvas/aqu?rio), em uma densidade de 10 larvas/L. As larvas foram submetidas a cinco tratamentos, quatro tipos de biofiltros internos compostos por: concha?brita, cascalho, porcelana, brita e um controle, sem biofiltro, distribu?das em um delineamento inteiramente ao acaso, com cinco tratamentos e quatro repeti??es. Os biofiltros compostos por concha/brita e porcelana obtiveram os melhores resultados em nitrato, nitrito e am?nia, indicando melhor efici?ncia no processo de biofiltra??o. A maior condutividade e pH porporcionada pelo concha/brita em rela??o ao porcelana, indica uma maior capacidade de tamponamento e manuten??o de qualidade de ?gua. O oxig?nio que n?o diferiu entre os tratamentos, esteve adequado para a esp?cie e para a recircula??o de ?gua. As sobreviv?ncias foram similares, mas verificou-se uma tend?ncia decrescente do concha/brita para a porcelana, cascalho, brita e sem substrato. Nos par?metros morfom?tricos, os biofiltros porcelana e cascalho diferenciaram dos demais tratamentos, apresentando os melhores resultados. Com os resultados obtidos, sugere-se a utiliza??o de biofiltro composto por porcelana ou concha/brita devido a maior efici?ncia nos par?metros limnol?gicos e morfom?tricos, associados a sobreviv?ncia na larvicultura de til?pias do Nilo. Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2011. The objective of this study was to compare different substrates biofilter in recirculated water at the hatchery of Nile tilapia (Oreochromis niloticus). 1200 larvae were used from the same spawn, with 10 days after hatching, initial length of 11.58 mm and average weight of 189 mg distributed in 20 aquariums with 6 L of water (60 larvae / aquarium) at a density of 10 larvae/L. Larvae were subjected to five treatments, four types of internal biofilters made of: shell?crushed stone, gravel, porcelain, crushed stone and a control without biofilter, distributed in a completely randomized design with five treatments and four replications. The biofilter composed of shell/gravel and porcelain have the best results in nitrate, nitrite and ammonia, indicating greater efficiency in the process of biofiltration. The higher conductivity and pH by proportional shell/gravel over the porcelain, indicates a higher buffering capacity and maintenance of water quality. The oxygen did not differ between treatments, was suitable for the species and for water recirculation. The survivals were similar, but there was a downward trend in the shell/gravel for the porcelain, gravel, crushed stone and without substrate. In the morphometric parameters, the porcelain and gravel biofilters differed from other treatments, delivering the best results .With these results, we suggest the use of biofilter composed of porcelain or shell/gravel due to greater efficiency in limnological and morphometric parameters associated with survival in Nile tilapia hatchery. |
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