2011
DOI: 10.1590/s1679-62252011005000043
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Abstract: The present work studied the reproduction of the flatfish Etropus crossotus in the Paranaguá Estuarine Complex, Paraná State, subtropical region of Brazil. Monthly collections of biological material occurred from October 2008 to October 2009, at seven sampling sites, through ten-minute otter trawl surveys in the shallow infralittoral areas of the estuary. Temperature, water salinity, photoperiod, and rainfall data were also recorded. Ovarian histology was used to: 1 -describe ovarian development microscopicall… Show more

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Cited by 11 publications
(6 citation statements)
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“…For the region, average annual precipitation is 2500 mm and average humidity is 85% (Lana et al 2001). The salinity inside the estuary, on the sites where samples were obtained, varied from 25 to 31 (Oliveira and Fávaro 2011), and outside the estuary it was 34 (SEMA 2006). After collecting, specimens were anesthetized with benzocaine, and had their spinal cord quickly sectioned, before being transported to the laboratory.…”
Section: Study Areamentioning
confidence: 99%
“…For the region, average annual precipitation is 2500 mm and average humidity is 85% (Lana et al 2001). The salinity inside the estuary, on the sites where samples were obtained, varied from 25 to 31 (Oliveira and Fávaro 2011), and outside the estuary it was 34 (SEMA 2006). After collecting, specimens were anesthetized with benzocaine, and had their spinal cord quickly sectioned, before being transported to the laboratory.…”
Section: Study Areamentioning
confidence: 99%
“…An inversely proportional relationship was observed between reproductive investment and the total condition of individuals within and between reservoirs, suggesting not only temporal but also local factors influenced the fish populations. The variations in the condition factor by year in the first case must be related to the supply and utilization of energy for the reproductive process, as noted by Oliveira and Favaro (, ). Over a reproductive cycle, the majority of species decrease their total condition during the period of intense reproductive activity, with an incremental increase in subsequent periods (Bernardes & Dias ).…”
Section: Discussionmentioning
confidence: 88%
“…Length at first maturity (L 50 ) was calculated by Fr=1-(℮ -aLm b ) (Fr= relative frequency of adult individuals; ℮= base of the Napierian logarithm; a and b are coefficients estimated by the least squares method, transforming the variables involved; and L m =midpoint of the length classes), according to Fávaro et al (2003) and Oliveira and Fávaro (2011) in reproductive studies on estuarine fish.…”
Section: Methodsmentioning
confidence: 99%