Sinopse das espécies de Menticirrhus Gill, 1861 (Osteichthyes, Sciaenidae) do Atlântico Ocidental

= 32.120; DF=1; P<0.001). The smallest individual (total length) for captured animals was a male of 13 cm whereas the largest was a female of 46 cm. The minimum size (total length) for a mature female was 19.8 cm. The size at first maturation (L 50 ) was 23 cm and females larger than 27 cm spawned at least once (L 100 ). The reproductive period for M. littoralis is from September to March. Gonadosomatic index (GSI) showed a clear seasonal pattern. Mean ovarian weight was highest in November when it reached 5% of total body weight. Apparently, there is a size gradient for M. littoralis in the area. Larger individuals inhabit deeper water, and they move to the coast mainly for spawning.Menticirrhus littoralis é uma espécie importante para a pesca esportiva e comercial no sul do Brasil. O presente trabalho objetiva estudar a biologia reprodutiva da espécie nas águas costeiras do Rio Grande do Sul. As capturas foram efetuadas na plataforma de pesca de Cidreira (30º 08' S; 50º 11' W), localizada na costa nordeste do Rio Grande do Sul, onde a pesca esportiva desenvolve-se ao longo de todo o ano. As capturas foram efetuadas exclusivamente por pescadores esportivos, utilizando linhas e anzóis de diferentes tamanhos e empregando iscas variadas. Um total de 807 indivíduos foi capturado entre junho de 1997 e maio 1998. A proporção sexual foi de 0,67 fêmea para cada macho (323 fêmeas e 484 machos; χ 2 c = 32,120; DF=1; P<0,001). O menor indivíduo capturado (comprimento total) foi um macho com 13 cm, enquanto que o maior foi uma fêmea com 46 cm. O menor tamanho (comprimento total) para uma fêmea madura foi 19,8 cm. O tamanho de primeira maturação (L 50 ) foi 23 cm e fêmeas maiores que 27 cm já reproduziram pelo menos uma vez (L 100 ). O período reprodutivo de M. littoralis é de setembro a março. O índice gonadossomático (GSI) apresenta uma clara tendência sazonal. O peso médio ovariano apresentou maiores valores em novembro, quando atingiu 5% do peso corporal. Aparentemente existe um gradiente de tamanho para M. littoralis na região, com indivíduos maiores ocorrendo em águas mais profundas e deslocando-se para águas mais rasas para desova.

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“…Two species are found in Brazilian waters: M. americanus and M. littoralis (Menezes & Figueiredo, 1980;Jardim, 1988).…”

Section: Introductionmentioning

confidence: 99%

Reproductive biology of Menticirrhus littoralis in southern Brazil (Actinopterygii: Perciformes: Sciaenidae)

Braun

Fontoura

2004

Neotrop. ichthyol.

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“…They consist of cartilaginous tissue surrounded by a multi-stratified epithelium of polygonal pavement cells, taste buds, mucous cells, mitochondriarich cells (Fiuza et al 2011;Fonseca Neto and Spach 1999;Kumari et al 2005), and claviform cells. This epithelium also exhibits structures called spines (Lopes and Sampaio 2002;Sergipensel et al 1999;Silva and Hahn 2009), or ctenii (Serra and Langeani 2006), or denticles (Jardim 1988;Rodrigues and Menin 2006). Most fish species possess gill rakers, but some families, such as Oligoplites perugiae (Eiras-Stofella 2000) and Xiphias gladius (Vaske Jr and Castello 1998), do not.…”

Section: Introductionmentioning

confidence: 99%

Ultramorphological changes in gill rakers of Astyanax altiparanae (Characidae) kept in contaminated environments

Lopes

Pereira

Alves

et al. 2017

Fish Physiol Biochem

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Most water bodies in Brazil, and in the world, are contaminated by some types of pollutants, ranging from sewage to metal/chemicals, carcinogenic products, and biodegradable detergents. Despite the extensive knowledge on their effects on fish biology and especially on gill morphology, research that concerns their impacts on gill rakers and implications in parameters such as food consumption cannot be found in the literature. Gill rakers are vital because, together with gills, they are responsible for the defense and protection of the organism and for selecting appropriate food for survival. When detergents, which can act as toxic chemical agents, get in contact with the body of the fish, they can cause severe effects that must be understood. Therefore, our study investigated ultramorphological changes in gill rakers of Astyanax altiparanae (Lambeth) caused by the exposure to biodegradable detergents. Fish were exposed to a 1 mg/L dilution of a mixture of detergents and pure water from an artesian well for 5 months. Results revealed that the first month of exposure to detergent caused dilation of chemical receptors in taste buds and the rise of a large number of orifices for mucus release among pavement cells in gill rakers, although only a small amount of mucus was found in fish exposed both to pure water and the detergent dilution. After 5 months, there was an increase in the dilation of these chemoreceptors, excess mucus on gill rakers of detergent groups, and the emergence of microbridges between microridges in pavement cells.

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“…Das espécies do Atlântico Sul, Menticirrhus americanus (Linnaeus, 1758) e Menticirrhus littoralis (Holbrook, 1855) são encontradas no litoral brasileiro. São peixes demersais de tamanho médio, bentófagos de epifauna e ocorrem em águas de pouca profundidade das regiões costeiras e estuarinas (Menezes & Figueiredo, 1980;Jardim, 1988).…”

Section: Introductionunclassified

Sistemática bioquímica de Menticirrhus americanus e Menticirrhus littoralis (Teleostei: Perciformes: Sciaenidae)

Cassano¹,

Levy²

1990

Braz. j. oceanogr.

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Populations of two congeneric species of southwestern Atlantic sciaenid fish, Menticin-hus americanus and Menticin-hus littoralis, analysed electrophoretically to detect isoenzyme variability, showed very little genetic variation and a moderately high similarity in their allelic composition. A total of 22 alleles encoded by 17 loci were observed. Interspecific variability were found for the loci G6pdh-A, G6pdh-B, Hbdh-B, Mdh-B and Sod-A. Intraspecific variation was observed only for Mdh-B in M. littoralis. The genetic similarity between M. americanus and M. littoralis (INEI +0.76) is congruentwith the high level of morphological similarity showed by these two congeneric species.

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Sinopse das espécies de Menticirrhus Gill, 1861 (Osteichthyes, Sciaenidae) do Atlântico Ocidental

Cited by 4 publications

References 3 publications

Reproductive biology of Menticirrhus littoralis in southern Brazil (Actinopterygii: Perciformes: Sciaenidae)

Reproductive biology of Menticirrhus littoralis in southern Brazil (Actinopterygii: Perciformes: Sciaenidae)

Ultramorphological changes in gill rakers of Astyanax altiparanae (Characidae) kept in contaminated environments

Sistemática bioquímica de Menticirrhus americanus e Menticirrhus littoralis (Teleostei: Perciformes: Sciaenidae)

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