scholarly journals Reproductive biology and development of gill glands in the inseminating characid, Macropsobrycon uruguayanae Eigenmann, 1915 (Cheirodontinae: Compsurini)

2010 ◽  
Vol 8 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Marco A. Azevedo ◽  
Luiz R. Malabarba ◽  
John R. Burns
Keyword(s):  
Reproductive Biology ◽  
Secretory Activity ◽  
Reproductive Period ◽  
Gonadal Maturation ◽  
A Value ◽  
Secondary Lamellae ◽  
Synchronous Development ◽  
Gill Filaments ◽  
Males And Females ◽  
Columnar Cells

The reproductive biology and development of the gill gland are described for Macropsobrycon uruguayanae, an inseminating characid species of the tribe Compsurini, subfamily Cheirodontinae. Between April 2001 and March 2002, 117 males and 143 females of this species were collected in the rio Ibicuí, Uruguay basin in the State of Rio Grande do Sul, Brazil. Reproductively active individuals were present during most months sampled, indicating lack of a well-defined seasonal reproductive period. Several maturing females were found to be inseminated before completing full maturation. Histological analyses demonstrated spermatozoa within the ovaries of females in different stages of gonadal maturation collected during most months. No immature females had inseminated ovaries. Standard length at first gonadal maturation was estimated to be 24 mm for both males and females. Mean absolute fecundity was 191.08 (± 48.83 SD) oocytes per female, one of the lowest among characids. Relative fecundity was 0.539 (± 0.069 SD) oocytes per mg weight of the female, a value similar to that found for the majority of species of Cheirodontinae. The presence of two cohorts of oocytes within ovaries of M. uruguayanae indicates synchronous development, with total spawning. The mean diameter of mature oocytes was 0.6711 (± 0.1252 SD) mm, smaller than that found for the majority of species of Characidae. Gill glands occurred in all mature males, as well as in males undergoing advanced maturation. In the latter case, fewer gill filaments comprised the glands. Gill glands were not observed in immature males, males undergoing the initial stages of maturation, or in any female. A given gill gland may comprise as many as 24 filaments of the lateral hemibranch of the first gill arch. Secondary lamellae within most of the gill gland are greatly reduced, with columnar cells being present between them. These columnar cells contain abundant vesicles, suggesting secretory activity. The morphology of the gill gland of M. uruguayanae resembles that found in the majority of characid species that possess this structure.

scholarly journals Reproduction of the catfish Iheringichthys labrosus (Lütken) (Pisces, Siluriformes) in Furnas reservoir, Minas Gerais, Brazil

2004 ◽  
Vol 21 (2) ◽  
pp. 193-200 ◽  
Author(s):  
José Enemir dos Santos ◽  
Nilo Bazzoli ◽  
Elizete Rizzo ◽  
Gilmar Bastos Santos
Keyword(s):  
Feeding Activity ◽  
Gonadosomatic Index ◽  
Secretory Activity ◽  
Minas Gerais ◽  
Reproductive Period ◽  
Mature Stage ◽  
Hepatosomatic Index ◽  
Gonadal Maturation ◽  
Caudal Region ◽  
Iheringichthys Labrosus

The reproductive biology of Iheringichthys labrosus (Lütken, 1874) was studied in Furnas reservoir, Minas Gerais, Brazil. The fishes, 323 males and 817 females, were captured bimonthly from August 1993 to July 1994 by using gill nets with 3-10 cm mesh size. Gonadal maturation of the specimens was analyzed through macro and microscopical characteristics of the gonads. The secretory activity of the tubules of the caudal region of the testis was analyzed during the maturational testicular cycle. Females and males were in reproductive activity throughout the year in the reservoir. The peak of advanced maturation/mature stages occurred from October to January and of spawned/spent from February to May. The spawning of I. labrosus was identified as fractional or multiple type: occurring in the reservoir or in tributaries around it. The oocyte development of the species was asynchronous as different clusters of oocytes occurred simultaneously in the ovarian parenchyma. The epithelium of the tubules of the caudal region of the testis was in high secretory activity during advanced maturation/mature stage and this activity was absence in resting. The gonadosomatic index followed gonadal maturation, and the hepatosomatic index of females was lowest in advanced maturation/mature probably due the contribution of the liver in the vitellogenesis. The variations of the stomach repletion index, coelomic fat and condition factor indicated that the feeding activity was reduced and that the energetic reserves were consumed during the reproductive period.

Reproductive biology and pathological changes of the Egyptian sole (Solea aegyptiaca, Chabanaud, 1927) from polluted waters of Abu-Kir Bay near Alexandria, Egypt

1994 ◽  
Vol 45 (7) ◽  
pp. 1181 ◽  
Author(s):  
SH Abdel-Aziz
Keyword(s):  
Reproductive Biology ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Industrial Wastes ◽  
Pathological Changes ◽  
Potential Fecundity ◽  
Untreated Sewage ◽  
Males And Females ◽  
Polluted Waters

Solea aegyptiaca in Abu-Kir Bay becomes mature at 18 and 20 cm total length for males and females respectively and within two years of age for both sexes. Spawning occurs in winter (December-February). The sizefrequency distribution of oocytes more than 100 pm in diameter indicates that S. aegyptiaca is a determinate spawner and that an annual potential fecundity can be measured. Low gonadosomatic index and low potential fecundity, low condition factor (K), and histological anomalies of the ovaries of some mature females have been observed during the reproductive period. The presence of pollutants in Abu-Kir Bay sediments resulting from industrial wastes and untreated sewage may be responsible for this alteration in oogenesis and the consequent drop in fecundity.

scholarly journals Reproductive biology of Oligosarcus argenteus (Gunther, 1864) adult males and description of the gonadal maturation stages

2009 ◽  
Vol 52 (1) ◽  
pp. 119-126 ◽  
Author(s):  
Sérgio Luis Pinto da Matt ◽  
Marcos de Lucca Moreira Gomes ◽  
Dálcio Ricardo de Andrade
Keyword(s):  
South America ◽  
Reproductive Biology ◽  
Reproductive Period ◽  
Morphological Parameters ◽  
Adult Males ◽  
Gonadal Maturation ◽  
Maturation Stages ◽  
Three Stages

Oligosarcus argenteus belongs to the Acestrorhynchinae subfamily, being restricted to South America, and found in several Brazilian hydrographic basins, in lotic and lentic environments, where they are able to reproduce. With the purpose of studying the reproductive biology of the males from this species, many morphological parameters were analyzed during a 24 month period, as well as characterizing the different testicular maturation stages. A maturity scale, with three stages (I - Initial Maturing, II - Intermediate Maturing, III - Final Maturing) was proposed for the adult males of Oligosarcus argenteus. The reproductive period was established by the bimonthly frequency of spermatogenesis and by the gonadal maturation stages.

scholarly journals Reproductive biology of Bryconamericus iheringii (Ostariophysi: Characidae) from rio Vacacaí, RS, Brazil

2004 ◽  
Vol 2 (4) ◽  
pp. 209-215 ◽  
Author(s):  
Vinicius Renner Lampert ◽  
Marco Aurélio Azevedo ◽  
Clarice Bernhardt Fialho
Keyword(s):  
Southern Hemisphere ◽  
Reproductive Biology ◽  
Reproductive Period ◽  
Total Weight ◽  
Day Length ◽  
Sexually Dimorphic ◽  
Gonadal Maturation ◽  
Relative Fecundity ◽  
Multiple Spawner ◽  
Fin Ray

In this paper we describe some aspects of the reproduction and development of secondary sexual characters of Bryconamericus iheringii, based on the analysis of 194 females and 210 males collected monthly in the rio Vacacaí (30º21'34"S and 54º18'48"W), from April 2001 to March 2002. The reproductive period occurred from September to January (spring and summer in the Southern Hemisphere), as described for other characids of the same area. The absolute fecundity mean was 933.71 ± 303.10 oocytes, and the relative fecundity mean was 0.36 ± 0.08 oocytes per mg of total weight, being the species a multiple spawner. There was no correlation between the values of GSI and variation of biotic (stomach repletion and hepatosomatic indexes) and abiotic data (rainfall, day length and temperature) but we suggest that these factors can influence the reproduction of the species acting as "starters" of the beginning of gonadal maturation. Fin-ray hooks consist in a sexually dimorphic character of the species. Well developed hooks were found mainly in mature males, during the reproductive period and in the largest individuals.

scholarly journals Reproductive biology of the peacock bass Cichla piquiti (Perciformes: Cichlidae), an exotic species in a Neotropical reservoir

2009 ◽  
Vol 7 (4) ◽  
pp. 745-750 ◽  
Author(s):  
Augusto B. C. Vieira ◽  
Luiz F. Salvador-Jr. ◽  
Rafael M. C. Melo ◽  
Gilmar B. Santos ◽  
Nilo Bazzoli
Keyword(s):  
Reproductive Biology ◽  
Native Species ◽  
Developmental Stages ◽  
Reproductive Activity ◽  
Health Condition ◽  
Reproductive Period ◽  
The Body ◽  
Maturation Stage ◽  
Males And Females ◽  
Peacock Bass

To analyze the reproductive biology of the peacock bass Cichla piquiti, 361 specimens were collected bimonthly in the Itumbiara Reservoir, southeast Brazil, from December 2004 to November 2005. Males and females in reproductive activity occurred during almost the entire year, with reproductive peak occurring before the beginning of the rains when the water temperature remained low, indicating that these environmental variables do not directly influence in the reproduction of C. piquiti. The long reproductive period, partially spent ovaries contained postovulatory follicles and oocytes in all developmental stages, indicate asynchronous development of oocytes and multiple spawning. The mean total lengthand body weigth were, respectively, 38.2 ± 7 cm and 965.0 ± 654.0 g for males and 37.4 ± 6.1 cm and 899.0 ± 495.0 g for females, statistically showing no sexual dimorphism in size. The smallest male and female found in advanced maturation stage measured 31.0 cm and 29.0 cm of total length, respectively. The body condition (K) of males and females did not present significant differences during the reproductive cycle and the slope (b) of the length-weight relationship was 3.22, suggesting that reproduction and the annual hydrology cycle do not interfere in the health condition. Cichla piquiti is an exotic piscivore fish that is well adapted to this Neotropical reservoir, which exhibits environmental conditions considerably different from its original habitat. This study indicates that the species presents plasticity in reproduction and in allocation of resources, probably due the aseasonality of the reservoir and the exploitation of native species.

scholarly journals Reproductive biology of the sesarmid crab Armases rubripes (Decapoda, Brachyura) from an estuarine area of the Sahy River, Sepetiba Bay, Rio de Janeiro, Brazil

2006 ◽  
Vol 96 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Giovana V. Lima ◽  
Marcelo R. S. Soares ◽  
Lídia M.Y. Oshiro
Keyword(s):  
Reproductive Biology ◽  
Rio De Janeiro ◽  
Egg Size ◽  
Carapace Width ◽  
River Estuary ◽  
Reproductive Period ◽  
Sepetiba Bay ◽  
Estuarine Area ◽  
Males And Females ◽  
Individual Fecundity

The aim of this work was to gain knowledge about reproductive biology of the crab Armases rubripes (Rathbun, 1897) from an estuarine area of the Sepetiba Bay. Samples were taken monthly from February 2003 to January 2004 in the Sahy River estuary (22º56'S; 44º01'W), Rio de Janeiro, Brazil. The crabs were collected by hand during 15-minute catch-effort sessions conducted by two people. In the laboratory, the specimens were separated by sex, carapace width was measured and gonadal stage was checked macroscopically. A total of 830 individuals were caught - 304 males, 373 females (60 ovigerous females) and 153 juveniles. The ovigerous females were found almost year-round, except in November and April, showing a continuous reproductive period. They presented a size range from 8.2 to 15.0 mm carapace width (12.1 ± 1.7 mm). Color and macroscopical aspects determined five gonadal stages for males and females (immature, rudimentary, intermediary, developed and resting). First sexual maturity was estimated at 6.5 mm of carapace width for males and 8.1 mm for females. Individual fecundity varied from 200 to 11,460 eggs (4,458 ± 2,739 eggs). Mean egg size was 0.248 ± 0.026 mm, varying from 0.213 to 0.333 mm, while the volume ranged from 0.0051 to 0.0188 mm³ (0.0082 ± 0.0029 mm³).

Some aspects of the reproductive biology of Rana esculenta at sea-level and montane habitats

1993 ◽  
Vol 14 (4) ◽  
pp. 381-388 ◽  
Author(s):  
Carlo Alfredo Murri ◽  
Alberta Maria Polzonetti-Magni ◽  
Oliana Carnevali ◽  
Maria Giovanna Sabbieti ◽  
Paolo Villani ◽  
...  
Keyword(s):  
Sea Level ◽  
Reproductive Biology ◽  
Plasma Levels ◽  
Recovery Period ◽  
Rana Esculenta ◽  
Reproductive Period ◽  
Males And Females ◽  
Estradiol 17Β ◽  
Two Populations ◽  
Mountain Population

AbstractWe studied the influence of altitude on the reproductive biology of two populations of Rana esculenta, one living at sea level in a lagoon and the other in the mountains. In the lagoon, where only slight fluctuations of air and water temperature occurred during the year, the reproductive period was longer than in the mountain population in which only one clutch was observed and where a sharp decline of temperature in autumn was consistent with a faster recovery period. High sex steroid plasma levels were found in amplexing males and females of both populations sampled in the field, compared with individuals. A pronounced effect of short-term captivity was found; androgens, estradiol- 17β and progesterone plasma levels decreased dramatically in amplexing frogs sampled in the laboratory 12 h after capture.

scholarly journals Reproductive biology of Triportheus trifurcatus (Castelnau, 1855) (Characiformes: Characidae) in the middle rio Araguaia, MT, Brazil

2008 ◽  
Vol 6 (2) ◽  
pp. 231-236 ◽  
Author(s):  
Mirian F. Martins-Queiroz ◽  
Lúcia A. de F. Mateus ◽  
Valdener Garutti ◽  
Paulo C. Venere
Keyword(s):  
Reproductive Biology ◽  
Standard Length ◽  
Average Length ◽  
Reproductive Period ◽  
Water Levels ◽  
The Other ◽  
Food Ingestion ◽  
Gonad Weight ◽  
Spawning Period ◽  
Gonadal Maturation

The study of the reproductive biology of Triportheus trifurcatus of the middle rio Araguaia was carried out using 275 specimens obtained in seven collections conducted in the period between November 2003 and January 2005. Females prevailed among the classes of intermediate length, as well as in the total number of samples. On the other hand, males prevailed in the smaller classes. The average length of females was larger than that of males. Four stages of gonadal maturation were macro- and microscopically identified: B - maturation, C - mature, D - spent and E - resting. Stage A (immature) was not found in the habitats sampled. The smallest-length male was 110 mm in standard length, and the smallest female, 119 mm. The spawning period occurred from November to January, with reproductive peak in December/January, coinciding with the highest water levels. The absolute fecundity is considered low, and there is a positive correlation between fecundity and gonad weight, body weight and standard length. Food ingestion during the reproductive period did not suffer any interference, and it is suggested complete spawning for this species.

Spatial distribution of the parasite Kroyeria carchariaeglauci Hesse, 1879 (Copepoda: Siphonostomatoida: Kroyeriidae) on gills of the blue shark (Prionace glauca (L., 1758))

1987 ◽  
Vol 65 (5) ◽  
pp. 1275-1281 ◽  
Author(s):  
George W. Benz ◽  
Kevin S. Dupre
Keyword(s):  
Spatial Distribution ◽  
Natural Selection ◽  
Distribution Pattern ◽  
Surface Area ◽  
Blue Shark ◽  
Prionace Glauca ◽  
Homogeneous Groups ◽  
Secondary Lamellae ◽  
Gill Filaments ◽  
Gill Surface Area

Five blue sharks (Prionace glauca) were examined for gill-infesting copepods. Three species of siphonostomatoid copepods were collected: Gangliopus pyriformis, Phyllothyreus cornutus, and Kroyeria carchariaeglauci. The spatial distribution of K. carchariaeglauci was analyzed. The number of K. carchariaeglauci per shark was positively related to gill surface area and host size. Copepods were unevenly distributed amongst hemibranchs; flanking hemibranchs could be arranged into three statistically homogeneous groups. Female K. carchariaeglauci typically attached themselves within the middle 40% of each hemibranch; males were more evenly dispersed. Eighty percent of all K. carchariaeglauci attached themselves to secondary lamellae, the remainder were in the underlying excurrent water channels. Most K. carchariaeglauci were located between 10 and 25 mm along the lengths of gill filaments. Overall, the spatial distribution of K. carchariaeglauci was quite specific in all study planes. Explanation of this distribution is set forth in terms of natural selection pressures; however, the equally plausible explanation that the distribution pattern exhibited by these copepods is phylogenetically determined and may have little to do with contemporary selective constraints should not be ignored.

scholarly journals Reproductive biology of Artibeus fimbriatus Gray 1838 (Chiroptera) at the southern limit of its geographic range

2016 ◽  
Vol 16 (4) ◽  
Author(s):  
Camila S. Lima ◽  
Marta Elena Fabián
Keyword(s):  
Reproductive Biology ◽  
High Temperatures ◽  
Rainy Season ◽  
Regional Climate ◽  
Geographic Range ◽  
Reproductive Period ◽  
Southern Limit ◽  
Reproductive Patterns ◽  
Pregnant Females

Abstract Bats of the Phyllostomidae family exhibit different reproductive patterns in Neotropical regions and the strategy adopted depends on the regional climate. Here we studied the reproductive biology of Artibeus fimbriatus at the southern limit of their distribution in Brazil. This region has no rainy season, and the climate is characterized by high temperatures and variable photoperiods. We examined 129 A. fimbriatus females over several months, and used histological procedures where necessary in order to determine whether bats were pregnant. Females exhibited a long reproductive period and were pregnant from June until February. The reproduction events were found to be dependent on the photoperiod, but independent of annual accumulated precipitation. Our results show that at the southern limit of their distribution, A. fimbriatus exhibit seasonal-dependent reproductive patterns, with parturition events occurring during spring and summer, in which the days are longer and temperature is warmer.

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