Influência da salinidade no crescimento de juvenis de Jenynsia multidentata Jenyns (Pisces)

G., Ana C.; Garcia, Alexandre; Vieira, João Paes

doi:10.1590/s0101-81752005000300041

Cited by 5 publications

(3 citation statements)

References 4 publications

(4 reference statements)

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“…There are evidences that J. lineata is especially abundant in systems with marine influence and also in typical freshwater environments (Garcia et al 2003, Bastos et al 2003. Mai et al (2005) also verified that juveniles of J. lineata showed higher growth rate and survival in intermediate salinities. Therefore, lower Estreito stream fits as a suitable environment for the occurrence and development of J. lineata.…”

Section: Resultssupporting

confidence: 58%

Composition, abundance and biomass of a fish assemblage in a southern Brazilian coastal stream during polyhaline/euhaline condition

2018

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The coastal streams of southernmost Brazil, Rio Grande do Sul state, are marked by a period of regular marine intrusion resultant from intense oceanic winds. In the present study we aimed to investigate the species composition, abundance and relative biomass of the ichthyofauna in the lower stretch of a coastal stream during summer, a period of regular marine intrusion. Estreito is a coastal hydrological complex composed by lakes, swamps and a perennial stream, located at the central-south portion of the coastal plain of Rio Grande do Sul state. During the summer of 2018, the ichthyofauna of lower Estreito stream was sampled by beach hauls applied in 17 random points distributed in a stretch of ca. 2km. Measurements at the sampled stretch revealed salinities between 19.3 to 31.3 ppt, characterizing the studied system as polyhaline/euhaline during summer. The sample of 4,533 specimens revealed the occurrence of 20 species, being the great majority marine-dwelling. The most abundant species were the anablepid Jenynsia lineata (70.3%), the cichlid Geophagus brasiliensis (19.3%) and the the mugilid Mugil curema (7.5%). The highest relative biomass was recorded for J. lineata, followed by M. curema and G. brasiliensis. The dominance of marine-dwelling species in the assemblage composition and the high abundance of limnic-estuarine J. lineata corroborate previous studies conducted in other washouts of Rio Grande do Sul.

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Section: Resultssupporting

confidence: 58%

Composition, abundance and biomass of a fish assemblage in a southern Brazilian coastal stream during polyhaline/euhaline condition

2018

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“…Jenynsia multidentata (Jenyns 1842) has been reported from brackish waters in the estuarine region of Lagoa dos Patos, Brazil (Garcia et al, 2001(Garcia et al, , 2004, and is known for its tolerance to high salinity (Ringuelet et al, 1967). Moreover, Mai et al (2005) showed that J. multidentata has a higher growth in high salinity environments. Fowler (1943) reported two individuals of Fitzroyia lineata lineata from 'Costas de Punta del Este, Maldonado, Uruguay' collected by Barattini in 1931.…”

mentioning

confidence: 99%

First record of the genus Jenynsia from marine water on the coast of Punta del Este, Maldonado, Uruguay (Cyprinodontiformes: Anablepidae)

Calviño¹,

Alonso

2016

Journal of Fish Biology

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“…The breeding season of subtropical populations in South Brazil and Uruguay is closely associated to the warmer months, and specimens reach larger sizes in estuaries (Fontoura et al, 1994;Garcia et al, 2004;Goyenola et al, 2011). Mai et al (2005) experimentally tested the effect of salinity on the rates of survival and growth in length and mass of newborns. Significantly higher rates were recorded under increases of salinity (6 to 16) when compared to decreases (6 to 0), suggesting a high affinity of J. multidentata to brackish waters.…”

Section: Discussionmentioning

confidence: 99%

A macroscopic classification of the embryonic development of the one-sided livebearer Jenynsia multidentata (Teleostei: Anablepidae)

2017

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This study proposes eight stages according to the main discernible changes recorded throughout the embryonic development of Jenynsia multidentata. The development of morphological embryo structures, pigmentation, and changes in tissues connecting mother and embryo were included in the stage characterization. From the fertilized egg (Stage 1), an embryo reaches the intermediary stages when presenting yolk syncytial layer (Stage 2), initial pigmentation of the outer layers of the retina and dorsal region of the head (Stage 3), and the sprouting of the caudal (Stage 4), dorsal and anal fins (Stage 5). During the later stages, the ovarian folds enter the gills, and the body pigmentation becomes more intense (Stage 6), the body becomes elongated (Stage 7), and there is a greater intensity in body pigmentation and increased muscle mass (Stage 8).The dry weight of the batches varied between 0.6 ± 0.3 mg (Stage 3) to 54.6 ± 19.7 mg (Stage 8), but the dry weight of the maternal-embryonic connecting tissues remained almost constant. After controlling the effect of those reproductive tissues, the gain in dry weight of the batches throughout development increased exponentially from Stage 6, reflecting the increase in size and weight of the embryos due to matrotrophy.Keywords: Developmental stages, Dry weight, Matrotrophy, Morphology, Viviparity.Este estudio propone una clasificación constituida por ocho etapas, establecidas con base en los principales cambios macroscópicos registrados a lo largo del desarrollo embrionario de Jenynsia multidentata. El desarrollo de estructuras embrionarias, los patrones de pigmentación y los cambios en los tejidos de conexión entre la madre y el embrión fueron incluidos en la caracterización de cada etapa. Inicia con el huevo fertilizado (Etapa 1), siguiendo con etapas intermedias del embrión en las cuales es visible la capa sincitial del vitelo (Etapa 2), la pigmentación inicial de las capas externas de la retina y el dorso de la cabeza (Etapa 3), y la aparición de las aletas caudal (Etapa 4), dorsal y anal (Etapa 5). En las etapas posteriores, los pliegues del tejido ovárico se introducen por las branquias y se intensifica la pigmentación corporal (Etapa 6), el cuerpo se extiende (Etapa 7) y hay un marcado aumento en la pigmentación corporal y masa muscular (Etapa 8). El peso seco de los lotes varió entre 0,6 ± 0,3 mg (Etapa 3) y 54,6 ± 19,7 mg (Etapa 8); sin embargo, el peso seco del tejido que conecta a la madre con el embrión se mantuvo prácticamente constante. Después de controlar el efecto del peso seco de estos tejidos, la ganancia de peso seco de los lotes de embriones a lo largo del desarrollo aumentó de forma exponencial a partir de la Etapa 6, evidenciándose en el aumento en tamaño y peso de los embriones debido a la matrotrofia.Palabras clave: Etapas del desarrollo, Matrotrofia, Morfología, Peso seco, Viviparidad.

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Influência da salinidade no crescimento de juvenis de Jenynsia multidentata Jenyns (Pisces)

Cited by 5 publications

References 4 publications

Composition, abundance and biomass of a fish assemblage in a southern Brazilian coastal stream during polyhaline/euhaline condition

Composition, abundance and biomass of a fish assemblage in a southern Brazilian coastal stream during polyhaline/euhaline condition

First record of the genus Jenynsia from marine water on the coast of Punta del Este, Maldonado, Uruguay (Cyprinodontiformes: Anablepidae)

A macroscopic classification of the embryonic development of the one-sided livebearer Jenynsia multidentata (Teleostei: Anablepidae)

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