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Previous issue date: 2014-03-19 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The composition of ichthyofauna discarded by trawling shrimping, their reproductive status and feeding ecology were studied on the beaches of Basin Rio Grande do Norte, Brazil. Fish were collected monthly in the year of 2012. During biometrics, portions of the digestive tract and of gonads were removed, fixed in formalin 10% and Bouin, respectively, for be submitted to histological processing by the techniques of hematoxylin-eosin. Stomach content analyzes were performed using the methods of Frequency of Occurrence and Volumetric and was calculated the repletion index. Throughout the study period were recorded a total of 49 species. The fish assemblages differed between sections monitoring, with the highest abundance, biomass and indices of richness and diversity in sections B, D and C. Already the excerpt A, showed higher values for dominance and equitability. In the cluster analysis according to the faunal similarity was observed the formation of three groups: group I formed by excerpts B and D, group II by excerpt C and group III formed by excerpt A. The assessment of reproductive stage revealed that the fish assemblages discarded by trawling are composed mainly of juveniles. Regarding the feeding ecology, the species Larimus breviceps, Menticirrhus littoralis and Pomadasys corvinaeformis characterized as carnivorous with tendency to carcinofagia. Already Conodon nobilis characterized as carnivorous with tendency to piscivory, but all proved generalist-opportunistic with increase of feeding activity during drought. The dendrogram of grouping of the species developed based on the food items used shows the formation of four groups: Group I consists of species that feed mainly of "gastropod" and "sediment"; group II of "teleost fish"; the group III of "crustacea" and group IV of "echinodermata" and "bivalve". The anatomical and histological characteristics of the digestive tract were consistent with the dietary habits of the analyzed species. In this context, the Costa Branca of Rio Grande do Norte can be considered a feeding site and recruitment for juveniles, which, opportunistically, utilize resources associated with the background / A composi??o da ictiofauna descartada pelo arrasto camaroeiro, sua fase reprodutiva e ecologia alimentar foram estudadas nas praias da Bacia Potiguar, Brasil. Os peixes foram coletados mensalmente, no ano de 2012. Durante as biometrias, por??es do tubo digest?rio e das g?nadas foram retiradas, fixadas em formol a 10% e Bouin, respectivamente, para serem submetidas ao tratamento histol?gico pelas t?cnicas de Hematoxilina-Eosina. Foram realizadas as an?lises de conte?do estomacal atrav?s dos M?todos de Frequ?ncia de Ocorr?ncia e Volum?trico e foi calculado o ?ndice de Reple??o. Ao longo do per?odo de estudo foram registrados um total de 49 esp?cies. As assembleias de peixes diferiram entre os trechos de monitoramento, com maior valor de abund?ncia, biomassa e dos ?ndices de riqueza e diversidade nos trechos B, C e D. J? o trecho A, apresentou maiores valores para domin?ncia e equitabilidade. Na an?lise de Cluster de acordo com a similaridade faun?stica, observou-se a forma??o de tr?s grupos: o grupo I formado pelos trechos B e D, o grupo II composto pelo trecho C e o grupo III formado pelo trecho A. A avalia??o do est?gio reprodutivo revelou que as assembleias de peixes descartadas pelos arrastos s?o compostas principalmente por juvenis. Em rela??o a ecologia alimentar, as esp?cies Larimus breviceps, Menticirrhus littoralis e Pomadasys corvinaeformis caracterizaram-se como carn?voras com tend?ncia a carcinofagia. J? Conodon nobilis caracterizou-se como carn?vora com tend?ncia a piscivoria, por?m todas se revelaram generalistas oportunistas e com maior atividade alimentar durante a estiagem. O dendograma de agrupamento das esp?cies com base nos itens alimentares ingeridos demonstrou a forma??o de quatro grupos: O grupo I composto por esp?cies que se alimentam principalmente de gastr?pode e sedimento ; o grupo II de tele?steo ; o grupo III de crustacea e o grupo IV de equinodermata e bivalve . As caracter?sticas morfohistol?gicas do tubo digest?rio das esp?cies analisadas mostraram-se consistentes com seus h?bitos alimentares. Assim, a Costa Branca do Rio Grande do Norte pode ser considerada um s?tio de alimenta??o e recrutamento para peixes juvenis, os quais se utilizam oportunisticamente de recursos associados com o fundo
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/13102 |
| Date | 19 March 2014 |
| Creators | Bomfim, Aline da Costa |
| Contributors | CPF:48554867472, http://lattes.cnpq.br/1421802360229451, Costa, Simone Almeida G. L., CPF:67196403487, http://lattes.cnpq.br/6556168670883302, Fragoso, Ana Bernadete Lima, CPF:01305951794, http://lattes.cnpq.br/6664350945721817, Silva, Fl?vio Jos? de Lima |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncias Biol?gicas, UFRN, BR, Biodiversidade; Biologia Estrutural e Funcional. |
| 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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