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Previous issue date: 2012-07-03 / This study focuses on the fish fauna composition and reproductive strategies of
four native fish species in relation to environmental variables of the Piranhas-Assu
hydrographic basin of the Caatinga biome, Rio Grande do Norte, Brazil. Fish and
environmental data were collected monthly during the period September 2008 to
February 2010, in the Marechal Dutra reservoir and River Acau? a tributary of Piranhas-
Assu. The fish were measured, weighed and dissected, and the gonads were removed,
weighed and examined macroscopically for identification and determination of gonad
maturation stages. The results of this work generated seven articles. The first article is
about the fish fauna composition of the Piranhas-Assu hydrographic basin, Rio Grande
do Norte. The 602 fish samples captured were distributed in four orders (Characiformes,
Perciformes, Siluriformes and Synbranchiformes), 11 families and 22 species, of which
17 are endemic to the Caatinga ecoregion. The order Characiformes was more
representative followed by Perciformes, Siluriformes and Synbranchiformes. The
second article is about the length-weight relationship and growth of seven native fish
species Crenicichla menezesi, Cichlasoma orientale, Triportheus angulatus,
Psectrogaster rhomboides, Pimelodella gracilis, Prochilodus brevis and Leporinus piau
from a semiarid Brazilian reservoir. The third article is about the reproductive aspects of
Crenicichla menezesi. Males were larger, heavier and with a slight predominance as
compared to females. Four stages of gonadal development were characterized, being
immature, maturing, mature and spent. The females reached sexual maturity earlier than
males, with an average fecundity of 398 oocytes per batch. The spawning was partial
with a long reproductive period. The fourth article deals with the reproductive strategy
of Leporinus piau a neotropical freshwater fish in semi-arid region of Brazil. The
population of L. piau (n = 211) showed a slight predominance of males (55%), with
larger and heavier females. The males matured earlier than the females. This species
presented total spawning, with an average fecundity of 55,000 mature oocytes. Rainfall
and concentration of dissolved oxygen acted as influential factors during the spawning
season. L. piau shows a seasonal reproductive strategy. The fifth article is related to the
morphometric-meristic characteristics and reproductive aspects of freshwater sardine,
Triportheus angulatus from River Acau? of the Caatinga biome. There was a
predominance of larger females, reaching first maturation before males. There was total
spawning during the rainy period of the region. The sixth article reports on the
reproductive strategy of Psectrogaster rhomboides. The sex ratio was 1M: 1F, with
negative allometric growth. Males reached sexual maturity earlier than females Females
and males showed four stages of gonadal development and spawned during the rainy
season. The fecundity was low and this species presented total spawning. The seventh
article reports on the dynamics of territorial behavior of Crenicichla menezesi. Ten
agonistic behaviors displayed by the males were observed: frontal and lateral threat,
chasing, circular chasing, perpendicular, lateral and mouth attacks, escape, parallel
positioning and stationary. The formation of four social groups was observed among
males: without interaction; interaction with submission and escape; with frontal and
lateral agonistic interactions. In social interactions between males and females, it was
observed that the larger males interacted more among themselves and with the larger
females. The large male established its territory and the two small males along with the
small female were excluded from the other groups. These studies clarified the fish fauna
composition and reproductive strategies of four native species Crenicichla menezesi,
Leporinus piau, Triportheus angulatus and Psectrogaster rhomboides of the Piranhas-
Assu hydrographic basin of the Caatinga biome, Rio Grande do Norte, Brazil. / O presente estudo trata da composi??o ictiofaun?stica e das estrat?gias
reprodutivas de quatro esp?cies nativas de peixes em rela??o ?s vari?veis ambientais da
bacia hidrogr?fica do rio Piranhas-Assu no bioma Caatinga, Rio Grande do Norte,
Brasil. As amostras dos peixes e os dados ambientais foram coletados mensalmente,
durante o per?odo de setembro de 2008 a fevereiro de 2010. Os peixes foram medidos,
pesados, dissecados e as g?nadas foram removidas, pesadas e examinadas para
identifica??o do sexo e determina??o do est?dio de matura??o das g?nadas. Os
resultados desse trabalho geraram sete artigos. O primeiro artigo ? sobre a composi??o
ictiofaunistica em um trecho da bacia Piranhas-Assu, Rio Grande do Norte. Foram
capturados 602 peixes, distribu?dos em quatro ordens (Characiformes, Perciformes,
Siluriformes e Synbranchiformes), 11 fam?lias e 22 esp?cies, das quais 17 s?o
end?micas da Caatinga. A ordem Characiformes foi mais representativa, seguida por
Perciformes, Siluriformes e Synbranchiformes. O segundo artigo trata sobre a rela??o
peso-comprimento e crescimento de sete esp?cies de peixes nativos Crenicichla
menezesi, Cichlasoma orientale, Triportheus angulatus, Psectrogaster rhomboides,
Pimelodella gracilis, Prochilodus brevis e Leporinus piau de um reservat?rio do
semi?rido brasileiro. O terceiro artigo ? sobre os aspectos reprodutivos do jacund?,
Crenicichla menezesi. Os machos foram maiores, mais pesados e com leve
predomin?ncia com rela??o ?s f?meas. Foram caracterizados quatro est?dios de
desenvolvimento gonadal, sendo: imaturo, em matura??o, maduro e esvaziado. As
f?meas atingiram a primeira matura??o sexual antes que os machos, com fecundidade
m?dia de 398 ov?citos por lote. A desova foi parcelada com um longo per?odo
reprodutivo. O quarto artigo trata da estrat?gia reprodutiva de Leporinus piau um peixe
de ?gua doce neotropical da regi?o semi?rida do Brasil. A popula??o amostrada de L.
piau (n = 211) mostrou uma ligeira predomin?ncia de machos (55%), com f?meas
maiores e mais pesadas. A primeira matura??o sexual dos machos ocorreu antes que as
f?meas. Esta esp?cie apresentou desova total, com fecundidade m?dia de 55.000
ov?citos maduros. As chuvas e a concentra??o de oxig?nio dissolvido atuaram como
fatores influentes durante a ?poca de desova. L. piau apresenta uma estrat?gia
reprodutiva sazonal. O quinto artigo ? sobre caracter?sticas morfom?tricas-mer?sticas e
aspectos reprodutivos da sardinha de ?gua doce, Triportheus angulatus do rio Acau? do
bioma Caatinga. Houve uma predomin?ncia de f?meas maiores, atingindo a primeira
matura??o gonadal antes que os machos. Houve desova total no per?odo de chuvas da
regi?o. O sexto artigo relata a estrat?gia reprodutiva da branquinha, Psectrogaster
rhomboides. Constatou-se uma propor??o sexual de 1:1, com tipo de crescimento
alom?trico negativo. Os machos atingiram a maturidade sexual antes que as f?meas. As
f?meas e os machos apresentaram quatro est?dios de desenvolvimento gonadal com o
per?odo de desova no per?odo de chuva. A fecundidade foi baixa e a esp?cie apresentou
desova total. O s?timo artigo relata a din?mica do comportamento territorial de
Crenicichla menezesi. Foram observados dez comportamentos agon?sticos exibidos
pelos machos, sendo amea?a frontal e lateral, persegui??o, persegui??o circular, ataque
perpendicular, lateral e bucal, fuga, posicionamento paralelo e perman?ncia. Foi
observada a forma??o de quatro grupos sociais entre os machos: sem intera??o, com
intera??o de submiss?o e fuga, com intera??o agon?stica frontal e lateral. Nas intera??es
sociais entre machos e f?meas foi observado que os machos maiores interagiram mais
entre si e com as f?meas maiores. O macho maior estabeleceu seu territ?rio e os dois
machos menores juntamente com a menor f?mea foram exclu?dos dos demais grupos.
Estes trabalhos esclareceram sobre a composi??o ictiofaun?stica e estrat?gias
reprodutivas de quatro esp?cies Crenicichla menezesi, Leporinus piau, Triportheus
angulatus e Psectrogaster rhomboides nativos da bacia hidrogr?fica piranhas-assu do
bioma Caatinga, RN, Brasil.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17220 |
| Date | 03 July 2012 |
| Creators | Araujo, Andrea Soares de |
| Contributors | CPF:15644812472, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787789Y9, Souza, Arrilton Ara?jo de, CPF:31568769415, http://lattes.cnpq.br/8822052460371633, Passavante, Jos? Zanon de Oliveira, CPF:00614874491, http://lattes.cnpq.br/7147339394595199, Yamamoto, Maria Em?lia, CPF:99079682853, http://lattes.cnpq.br/1410667846560350, Rocha, Odete, CPF:86476948434, http://lattes.cnpq.br/7577441794992601, Chellappa, Sathyabama |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Psicobiologia, UFRN, BR, Estudos de Comportamento; Psicologia Fisiol?gica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| 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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