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Previous issue date: 2012-04-12 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In northeastern Brazil, Octopus insularis is the most commercially important cephalopod species and its capture has been performed for several years by the lobster fishermen in the region. In order to obtain information about the reproductive biology, 1108 specimens were collected between November 2009 and September 2011 in the landings and fish markets of Rio do Fogo (RN). For each specimen the mantle length (CM) and total fresh weight (PT) were recorded. Gonads of 264 males and 295 females were examined macroscopically and histologically to assess sexual maturation and determine reproductive indices. Four reproductive stages were determined for males (immature, maturing, mature and post-mature) and females (immature, early maturing, late maturing and mature). The average of eggs recorded in the female s gonads was 93.820 and 39 was the average of spermatophores found in male Needham s complex. Spermathecae with sperm were found in females with 69 mm CM (immature). Males and females become sexually mature at 64.41 and 98.50 mm of CM, respectively. The weight at sexual maturity was 270 g for males and 630 g for females. The values of the size and weight at sexual maturity found in this study show that males mature at smaller sizes than females. For both sexes the maturation peaks occurred in February and November 2010 and also in September 2011. The periods of maximum reproductive activity lasted about 3 months and it seems to occur every 7 10 months. Only one spent female (stage V) was found and the number of mature females was low. Presumably, mature females migrate to deep waters with complex habitat to protect the offspring, indicating that fishery by snorkeling with maximum depth of 15 meters is not reaches this part of the stock. Finally, it is noticeable the importance of the establishment of management strategies for the exploitation of O. insularis different of the ones used for O. vulgaris, once the species have distinct biological features / No Nordeste do Brasil, Octopus insularis ? a esp?cie de polvo de maior import?ncia comercial e sua captura tem sido realizada durante muitos anos pelos mesmos pescadores de lagosta da regi?o. Visando obter informa??es a respeito da biologia reprodutiva dessa esp?cie, foram realizadas amostragens entre novembro de 2009 e setembro de 2011, nas quais foram registrados o comprimento do manto (CM) e o peso fresco total (PT) de 1.108 exemplares presentes nos desembarques e peixarias do munic?pio de Rio do Fogo (RN). Desse total foram coletadas aleatoriamente 264 g?nadas de machos e 295 de f?meas, as quais foram analisadas quanto ao grau de matura??o e pesadas para obten??o dos ?ndices reprodutivos. Foram determinados quatro est?gios reprodutivos macro e microsc?picos para machos (imaturo, maturando, maduro, p?s-maduro) e f?meas (imatura, in?cio da matura??o, final da matura??o, madura), al?m de determinada a fecundidade. O n?mero m?dio de ovos encontrados nos ov?rios das f?meas foi 93.820 e uma m?dia de 39 espermat?foros no saco de Needham nos machos. Foram encontradas f?meas com espermatozoa na espermateca a partir de 69 mm de CM, ainda imaturas. O CM da primeira matura??o (L50) foi 64,41 e 98.5 mm e o peso foi 270 e 630 g em machos e f?meas, respectivamente, evidenciando que os machos maturam em um tamanho e peso inferiores ?s f?meas. Os picos de matura??o foram registrados em fevereiro e novembro/2010 e setembro/2011. As ?pocas de maior atividade reprodutiva duraram cerca de 3 meses e ocorreram em intervalos de 7 a 10 meses. Apenas uma f?mea no est?gio V foi encontrada e o n?mero de f?meas no est?gio IV foi baixo. Provavelmente as f?meas maduras migram para ?guas mais profundas de habitats mais complexos com o intuito de realizar a desova, indicando que a pesca atrav?s do mergulho livre, realizada at? a profundidade m?xima de 15 m, n?o est? acessando essa parcela do estoque. Finalmente fica evidenciada a import?ncia de se estabelecerem estrat?gias de manejo para a explora??o de O. insularis, as quais devem diferir das normas atuais aplicadas ? pesca de O. vulgaris, pois as duas esp?cies possuem caracter?sticas biol?gicas distintas
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/14032 |
| Date | 12 April 2012 |
| Creators | Lima, Fran?oise Dantas de |
| Contributors | CPF:02270395484, http://lattes.cnpq.br/1003039770050759, Carvalho, Adriana Rosa, CPF:10966352831, http://lattes.cnpq.br/1951710128353552, Haimovici, Manuel, CPF:24823821068, http://lattes.cnpq.br/1231634900689178, Leite, Tatiana Silva |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ecologia, UFRN, BR, Bioecologia Aqu?tica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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