Follicular diameter range based on morphological features in Synbranchus marmoratus (Bloch, 1795) (Teleostei, Synbranchiformes, Synbranchidae) from the South-central region of Brazil

Spadella, Maria Angélica; Castilho-Almeida, Rodrigo Braz de; Quagio-Grassiotto, Iranı́; Cesário, Maria Dalva

doi:10.1016/j.tice.2004.10.006

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…In the present study, the fine structure of presynaptic group of cell in marine habitat was surrounded by large number of active organelles (mitochondria and endoplasmic reticulum), whereas in brackish and fresh water habitat, the presynaptic cells were poor in organelles. The presence of these cells in nests with the ovigerous lamellae also occurs in other species (Guimaraes and Quagi Gorassiotto, 2001;Spadella et al, 2005).…”

Section: Discussionsupporting

confidence: 57%

“…Grant (1990) characterized the vacuolization stage by the cortical alveoli layer formation. Spadella et al (2005) indicated that: alveoli formation starts with secondary growth and at the end of this stage these vesicles are in their highest concentration in the same region. According to Patino and Sullivan (2002) and Arocha (2002), cortical alveoli are necessary during fertilization because it releases its contents into the perivitelline space, to be structurally and functionally transformed to vitelline envelope, which blocks polyspermia.…”

Section: Discussionmentioning

confidence: 98%

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Biological, histological and ultra-structural studies of female mullet, Mugil cephalus, ovaries collected from different habitats during annual reproductive cycle

Assem¹,

Rahman²,

Absawey³

et al. 2015

Afr. J. Biotechnol.

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This study investigates some biological characters (oocyte diameter, fecundity, histological and ultra structural features) of female Mugil cephalus ovaries collected from three different natural habitats: marine (MW), brackish (BW) and fresh (FW) water. Monthly gonadosomatic index (GSI) values clearly showed that the time period of reproductive activity in female M. cephalus from marine and brackish water habitats was from early September to late November. No peak value of GSI in females collected from freshwater was observed throughout the year. Analysis of ovum diameter for M. cephalus in the two habitats revealed that, there are small diameter ova (less than 0.3 mm) and large ova (larger than 0.35 mm). The percentage of small ova diameter was 5±1% in marine habitat, while 27±3% for brackish water habitat. The mean oocyte diameters in fresh water fish were less than 350 µm. The oocytes did not develop enough to be differentiated into small and large diameter ova. The total number of ripe ova in marine fish varied between 0.84 ± 0.05 to 4.14±1.01 x10 6 for a total length ranging between 35 and 52 cm, respectively; whereas, the total number of ripe ova in brackish water fish ranged from 0.57±0.14 to 3.81±0.59 x10 6 for the same length groups. There was highly significant correlation (p>0.01) between the number and length of ripe ova in 37 and 50 cm length group from the two habitats. Yolky nucleus or Balbiani's body and interstitial epithelial cells are a characteristic feature of oocytes at maturing stage, which is clearly detected in marine water fish with isolated follicular and active organelles. In brackish and fresh water fish ovary, the cytoplasm was compacted without accumulation of active organelles. Ultra structurally vacuolized oocyte wall in marine fish showed the presence of the fifth layer (cortical alveoli) while no cortical alveoli formation was observed in oocyte of brackish or fresh water females. The percentage of atretic oocytes in late vitellogenic ovary of marine water fish was about 2.5%, while in brackish water fish it was about 92±2%. In both brackish and fresh water fishes the initial stage of oocytes atresia degeneration was observed. In conclusion, the comparative study shows that ovary of marine and brackish M. cephalus morphologically overlaps from ripening to re-sorption stages. With the histological and fine structure characteristics, it was possible to understand the functional relationship between oocyte size and stage of fish maturation. This knowledge is of huge importance in establishing the reproductive status of the fish which is related to the functional expression of the folliculogenesis in female individuals.

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Section: Discussionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 98%

Biological, histological and ultra-structural studies of female mullet, Mugil cephalus, ovaries collected from different habitats during annual reproductive cycle

Assem¹,

Rahman²,

Absawey³

et al. 2015

Afr. J. Biotechnol.

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“…The morphological characteristics of S . marmoratus female germ cells in various development stages were described in an earlier study based on measurements of ovarian follicle diameters (Spadella, de Castilho‐Almeida, Quagio‐Grassiotto, & Cesario, ). Their observations showed that it was possible to group oocytes by stages according to histological characteristics but not according to morphometric diameter, as there was a wide variation in diameter in each stage and overlap between different maturation stages.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus Bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil

et al. 2017

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Summary This study characterizes the dynamics of sex reversal in the marbled swamp eel, Synbranchus marmoratus (Osteichthyes: Synbranchidae), a diandric hermaphrodite, within the context of managing species with complex sex allocations. Monthly sampling in Marechal Dutra Reservoir, northeastern Brazil, was conducted using metal eel traps from July, 2013, to June, 2014, during which a total of 288 individuals were captured. Morphological and histological comparisons of gonads identified four sex types: primary males (n = 18), females (n = 197), transitional individuals (n = 30), and secondary males (n = 43). Primary males were smallest, ranging 18–32 cm total length. Females were numerically dominant throughout the 1‐year sampling period, and ranged 20–60 cm. Transitional individuals ranged 32–60 cm, and secondary males ranged 46–74 cm. The otolith‐based age of 52 specimens ranged 0.5 to 5+ year. Primary males were only observed at ages 0.5 and 1, and transitional individuals were only observed at ages 3 and 4 during the female‐to‐secondary‐male transition, supporting the existence of two types of individuals: gonochoristic males and protogynous hermaphrodites. This observation was further supported by histological observations of deteriorating ovarian tissue in transitional individuals. Given the length of time required for individuals to attain secondary male status, this species appears to be particularly vulnerable to over‐exploitation. Comparisons with results from other studies suggest sex allocations and adult size distributions vary substantially within this species’ range, adding complexity to management efforts.

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“…Although this study did not aim at reviewing all of the existing maturation scales for teleost fishes, it must be pointed out that a confusing number have been published: from simple three-stage (Spadella et al 2005), four-stage (Brito and Bazzoli 2003;Ravaglia and Maggese 2003) and five-stage (PerezVega et al 2006;Yamaguchi et al 2006) scales to more complicated ones with seven (Coward and Bromage 1998;Robillard et al 2008), eight (Legendre andEcoutin 1989;Poortenaar et al 2001) or nine stages (da Silva et al 2003). Rather, the aim of this study was to provide a synthetic, yet precise scale that could be used in most teleost fish species and to clarify the terminology found in the literature relative to oocyte or ovarian stages and their use for determining some life history traits.…”

Section: Introductionmentioning

confidence: 99%

Towards a universal scale to assess sexual maturation and related life history traits in oviparous teleost fishes

Núñez

Duponchelle

2008

Fish Physiol Biochem

110

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The literature presents a confusing number of macroscopic maturation scales for fish gonads, varying from over-simplified scales comprising three to four stages to highly specific and relatively complicated nine-stage scales. The estimation of some important life history traits are dependent on a correct assessment and use of the gonadal maturation scales, and frequent mistakes have been made in many studies. The goal of this report is to provide a synthetic, relatively simple, yet precise maturation scale that works for most oviparous teleost fishes. The synthetic scale proposed here is based on the correspondence between key physiological and cytological processes of gamete development and corresponding modifications observed at the macroscopic level. It is based on previous and ongoing studies of several fish species pertaining to some of the most important African and Neotropical taxa, including Characiformes, Siluriformes, Osteoglossiformes and Perciformes. This scale should allow for standardized protocols of field studies and improve intra- and inter-specific comparisons of life history traits. Guidelines on the correct use of this scale to estimate these life history traits are provided.

show abstract

Follicular diameter range based on morphological features in Synbranchus marmoratus (Bloch, 1795) (Teleostei, Synbranchiformes, Synbranchidae) from the South-central region of Brazil

Cited by 5 publications

References 22 publications

Biological, histological and ultra-structural studies of female mullet, Mugil cephalus, ovaries collected from different habitats during annual reproductive cycle

Biological, histological and ultra-structural studies of female mullet, Mugil cephalus, ovaries collected from different habitats during annual reproductive cycle

Dynamics of sex reversal in the marbled swamp eel (Synbranchus marmoratus Bloch, 1795), a diandric hermaphrodite from Marechal Dutra Reservoir, northeastern Brazil

Towards a universal scale to assess sexual maturation and related life history traits in oviparous teleost fishes

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