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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Reprodução, desenvolvimento embrionário e larvicultura do “neon goby” Elacatinus Figaro em laboratório

Shei, Marcelo Roberto Pereira January 2008 (has links)
Dissertação(mestrado)-Universidade Federal do Rio Grande, Programa de Pós-Graduação em Aqüicultura, Instituto de Oceanografia, 2008. / Submitted by Cristiane Silva (cristiane_gomides@hotmail.com) on 2012-07-22T21:55:11Z No. of bitstreams: 1 dissertaao shei.pdf: 955699 bytes, checksum: 8f9882265e94129eca93eb60bbe7cdf7 (MD5) / Approved for entry into archive by Bruna Vieira(bruninha_vieira@ibest.com.br) on 2012-07-27T19:09:22Z (GMT) No. of bitstreams: 1 dissertaao shei.pdf: 955699 bytes, checksum: 8f9882265e94129eca93eb60bbe7cdf7 (MD5) / Made available in DSpace on 2012-07-27T19:09:22Z (GMT). No. of bitstreams: 1 dissertaao shei.pdf: 955699 bytes, checksum: 8f9882265e94129eca93eb60bbe7cdf7 (MD5) Previous issue date: 2008 / O “neon goby” Elacatinus figaro é endêmico da costa brasileira e foi uma das espécies mais importantes no comércio de peixes ornamentais marinhos do país. Atualmente, encontra-se na lista de espécies ameaçadas de extinção e resguardadas do extrativismo. Este trabalho teve como intuito descrever a reprodução, o desenvolvimento embrionário e a larvicultura do “neon goby” em laboratório. As primeiras desovas naturais foram observadas a partir do 24° dia após a formação dos casais, sendo o intervalo entre as desovas de 8 a 10 dias a 26°C. A fecundidade variou de 430 a 1.020 ovos por desova com média de 648 ± 183 ovos (média ± desvio padrão1, com taxa de eclosão média de 69 ± 16% Os ovos são elípticos, medem 1,81 ± 0,1 mm de comprimento e 0,61 ± 0,03 mm de diâmetro, eles apresentam filamentos adesivos na parte basal e contêm cinco protuberâncias na parte distal. O tempo para eclosão das larvas é de 7 a 8 dias. As larvas recém eclodidas medem 3,15 ± 0,07 mm, apresentam fototaxia positiva, olhos pigmentados, boca aberta e vesícula gasosa inflada. As larvas foram alimentadas com rotíferos Brachionus plicatilis em sistema de água verde com a microalga Nannochloropsis oculata do 1° ao 20° dia após a eclosão. Náuplios de Artemia foram oferecidos a partir do 15 ° dia em conjunto com rotíferos e, exclusivamente, a partir do 20° dia. O assentamento ocorreu a partir do 28° dia, quando as larvas do “neon goby” atingiram comprimento de 8,50 ± 0,18 mm com sobrevivência entre 2 e 20%. / The “neon goby” Elacatinus figaro is endemic of the Brazilian coast and was one of the most important species in the marine ornamental fish trade in the country. Today it is on the list of endangered species and it can no longer be collected in the wild. This work was carried out in order to describe natural breeding, embryonic development and larviculture of neon goby in laboratory. The first natural spawning was observed 24 days after the pairs were formed 8 to 10 days at 26°C. Mean fecundity was 648 ± 183 (± SD) eggs per clutch and ranged from 430 to 1020 eggs, the hatching rate was 69 ± 16%. Eggs are elliptical in shape, they present adhesive filaments at the proximal end and five protuberances at the distal end. Egg length averaged 1.81 ± 0.1 mm and maximum width was 0.61 ± 0.03 mm. The embryonic developmental period lasts between 7 and 8 days. The newly hatched larvae measure 3.15 ± 0.07 mm, showing positive phototaxis, pigmented eyes, mouth opened and insufflated gas bladder. Larvae were fed with rotifers Brachionus plicatilis in green water system along with the microalgae Nannochloropsis oculata from day 1 to day 20 day after hatching. Artemia nauplii were added to the diet on day 15, and 5 days later rotifers were no longer offered. Larvae began to settle to the bottom on day 28, when length of neon goby was 8.50 ± 0.18 mm, the final survival rate ranged between 2 and 20%.

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