scholarly journals AMPLIACIÓN GEOGRÁFICA DEL TIBURÓN SIETE BRANQUIAS O BOCADULCE HEPTRANCHIAS PERLO BONNATERRE (HEXANCHIFORMES: HEXANCHIDAE) PARA EL CARIBE CONTINENTAL COLOMBIANO

2016 ◽  
Vol 45 (2) ◽  
Author(s):  
Rafael Anguila ◽  
Luis Eduardo Nieto Alvarado ◽  
Juan Carlos Narváez Barandica ◽  
Luis Hernández Beracasa ◽  
Arturo Acero P.
Keyword(s):  
Geographic Distribution ◽  
Mature Female ◽  
Pregnant Females ◽  
Total Length ◽  
Heptranchias Perlo

The geographic distribution of the sharpnose seven gill shark Heptranchias perlo (Hexanchidae: Hexanchiformes) is expanded for the Colombian mainland Caribbean, from three specimens caught with monofilament gillnets of 13, 10 and 9 cm between 80 and 100 m depth, in the area between Puerto Colombia and Sabanilla, Atlántico. Specimens measured 1000, 978-980 mm total length; and a weight of 3, 3 and 2.75 kg respectively; sharks from Puerto Colombia were pregnant females and the Sabanilla specimen a nonpregnant but mature female.

Gynacantha dryadula sp. nov. from the Guiana Shield (Odonata, Anisoptera: Aeshnidae)

Zootaxa ◽  
2017 ◽  
Vol 4254 (5) ◽  
pp. 563 ◽  
Author(s):  
ULISSES GASPAR NEISS ◽  
JÜRG DE MARMELS
Keyword(s):  
New Species ◽  
French Guiana ◽  
Color Pattern ◽  
Mature Female ◽  
Mature Male ◽  
Guiana Shield ◽  
Small Species ◽  
Apical Spine ◽  
Total Length ◽  
Amazonas State

The new species is described and illustrated on the basis of two reared, subteneral males from Brazil, their larval exuviae, a mature male from French Guiana, a mature female from Venezuela, and a mature female from Surinam. One of the Brazilian males is the holotype (BRAZIL, Amazonas State, Manaus, Reserva Florestal Ducke, BR 174-km 26, trail to Acará creek, 02º55’47”S, 59º58’22”W, 0.7 m elevation, deposited in INPA). The new species (total length 50–54 mm) differs from other small species of same genus by color pattern of thorax, middle and hind tibiae dark with external (dorsal) yellow streak, male cercus with truncated tip lacking apical spine, and male epiproct reaching or slightly surpassing midlength of cercus. The larva, besides of its small size (28–31 mm), has an epiproct with well-developed and slightly diverging apical spines and an unusually long paraproct. 

scholarly journals Morphofunctional changes in testes of rats born to mothers with simulated fetoplacental insufficiency and its correction

2020 ◽  
Vol 22 (2) ◽  
pp. 43-49
Author(s):  
N. Yu. Seliukova ◽  
◽  
Yu. B. Laryanovska ◽  
I. V. Volokhov ◽  
D. V. Morozenko ◽  
...  
Keyword(s):  
Age Groups ◽  
Mature Female ◽  
The Body ◽  
Male Offspring ◽  
Reproductive Age ◽  
Qualitative Assessment ◽  
Histological Structure ◽  
Pregnant Females ◽  
Germ Cell Differentiation ◽  
Pharmaceutical Composition

Nowadays, it is almost unknown how fetoplacental insufficiency of mothers affects the formation of the reproductive system in male offspring during puberty. Therefore, the aim of this work was to study the histological structure of the testes of male offspring born to mothers of different ages with fetoplacental insufficiency and to evaluate the effectiveness of a new pharmaceutical composition for the correction of pathological conditions of pregnancy. The experiment involved healthy mature female Wistar rats in young (3–4 months) and mature (8–10 months) reproductive age. Eight groups with 7 pregnant females in each one were formed: groups 1 and 2 — intact animals of young and mature reproductive age, respectively; groups 3 and 4 — females with experimental fetoplacental insufficiency of young and mature reproductive age; groups 5 and 6 — young and mature animals with experimental fetoplacental insufficiency and addition to food depending on the weight of animals from 11 to 19 days of pregnancy pharmaceutical composition. Groups 7 and 8 — young and mature animals with experimental fetoplacental insufficiency with addition a comparison drug Dipyridamole to the food. Modeling of fetoplacental insufficiency was performed by daily subcutaneous injection to females from the 12th to the 18th day of pregnancy 50% oil solution of carbon tetrachloride at a dose of 2 ml/kg body weight. Offspring were decontaminated on the 50th day of life (puberty) by rapid decapitation. Samples of male testicles were fixed in 10% formalin solution, performed on alcohols of increasing strength, poured into paraffin. Sections were made from the blocks, which were stained with hematoxylin and eosin. Qualitative assessment of histostructure was performed on sections of the body in rats. Summing up the results of histological analysis and morphometric parameters characterizing the condition of the testicles of rats, we can draw the following conclusions. In the offspring born to reproductively young females with fetoplacental insufficiency, inhibition of the rate of germ cell differentiation was found, while in the offspring born to reproductively mature females with fetoplacental insufficiency, the negative effects of this effect were leveled and the rate of spermatogenesis increased. When the pharmaceutical composition was administered to both young and mature pregnant females on the background of fetoplacental insufficiency, it activated the processes of proliferation and differentiation of spermatogenic epithelium in their offspring, which was reflected in the appearance of mature sperm in the seminal tubules. The comparison drug Dipyridamole, administered according to the same regimen to both young and mature pregnant females with fetoplacental insufficiency, also helped the 50-day-old offspring of these females to restore the rate of spermatogenesis at the level of the pharmaceutical composition.

scholarly journals Digenea in the surubim Pseudoplatystoma corruscans (Spix and Agassiz, 1829) (Siluriformes: Pimelodidae) of the upper São Francisco River, State of Minas Gerais, Brazil

2008 ◽  
Vol 51 (6) ◽  
pp. 1181-1185 ◽  
Author(s):  
Renata de Fátima da Silva Stravalli Corrêa ◽  
Marilia de Carvalho Brasil-Sato
Keyword(s):  
Geographic Distribution ◽  
Parasite Prevalence ◽  
Minas Gerais ◽  
Important Food ◽  
Sao Francisco River ◽  
Total Length ◽  
São Francisco River ◽  
Food Fish ◽  
Commercial Value ◽  
First Time

The specimens of surubim, Pseudoplatystoma corruscans (Spix and Agassiz, 1829), an important food fish with high commercial value in the Upper São Francisco River, were collected downstream from the Três Marias Dam, in the municipality of Três Marias, State of Minas Gerais, Brazil. Thirty-six individuals were examined and among the parasites, four species of Digenea were found: Witenbergia witenbergi Vaz, 1932 and Tylodelphys sp. (metacercarie), both with prevalence above 10%, followed by Acanthostomum gnerii (Szidat, 1958) and Acanthostomum sp.. The total length of the hosts did not influence the parasite prevalence. Witenbergia witenbergi occurred only in female hosts and the abundance of Tylodelphys sp. was higher in the males. These Digenea were recorded for the first time in P. corruscans, and their known geographic distribution has been expanded to the São Francisco Basin in Brazil.

scholarly journals Observations on the reproductive biology of three catsharks (Carcharhiniformes: Scyliorhinidae:AsymbolusandFigaro) from the continental shelf of southern Queensland, Australia

2010 ◽  
Vol 91 (6) ◽  
pp. 1157-1164 ◽  
Author(s):  
Peter M. Kyne ◽  
Anthony J. Courtney ◽  
Michael B. Bennett
Keyword(s):  
Continental Shelf ◽  
Reproductive Biology ◽  
Reproductive Mode ◽  
Mature Female ◽  
Mature Male ◽  
Size At Maturity ◽  
Commercial Fishery ◽  
Outer Continental Shelf ◽  
Total Length ◽  
Egg Case

Three species of Australian endemic catsharks (grey spotted catsharkAsymbolus analis, orange spotted catsharkA. rubiginosusand Australian sawtail sharkFigaro boardmani) were collected from the trawl grounds of a highly seasonal commercial fishery off southern Queensland, Australia. Specimens were collected on the mid to outer continental shelf at depths between 78 and 168 m. This study provides the first information on the reproductive biology of these three poorly-known species. Mature female and maleA. analiswere observed from 455 mm total length (TL), mature femaleA. rubiginosusfrom 410 mm TL, mature maleA. rubiginosusfrom 405 mm TL, mature femaleF. boardmanifrom 402 mm TL and mature maleF. boardmanifrom 398 mm TL (although a lack of immature specimens precluded more accurate assessments of size at maturity). The reproductive mode of all species was confirmed as single oviparous (carrying only one egg case in each uterus at a time). Ovarian fecundity (the number of vitellogenic follicles) ranged from 7–20 inA. analis, 5–23 inA. rubiginosusand 9–13 inF. boardmani. Several indicators suggest thatAsymboluscatsharks off southern Queensland are reproductively active year-round. The proportion of femaleA. rubiginosuscarrying egg cases was highest in spring (60%), intermediate in autumn (50%) and lowest in winter (44%).

scholarly journals Fecundity of Northeast Atlantic spurdog (Squalus acanthias)

2008 ◽  
Vol 65 (6) ◽  
pp. 979-981 ◽  
Author(s):  
Jim R. Ellis ◽  
Jennie Keable
Keyword(s):  
Mature Female ◽  
Squalus Acanthias ◽  
Irish Sea ◽  
Marine Science ◽  
Northeast Atlantic ◽  
Density Dependent ◽  
Total Length ◽  
Upper Limits ◽  
Near Term ◽  
The Irish Sea

Abstract Ellis, J. R., and Keable, J. 2008. Fecundity of Northeast Atlantic spurdog (Squalus acanthias). – ICES Journal of Marine Science, 65: 979–981. A large catch of mature, female spurdog (Squalus acanthias) was made on 22 November 2005 in the Irish Sea. Examination of a subsample of 202 of these fish (82–117-cm total length, L) indicated that 28% were carrying near-term pups, 70% year one pups, and 1% candles. Uterine fecundity (F) for those fish that were not considered to have aborted pups (n = 179) ranged from 3 to 21 and increased with total length, where F = 0.428 L−31.87. The upper limits of these fecundity estimates are the highest recorded for spurdog in the Northeast Atlantic. These data are discussed in relation to previously published fecundity estimates and the possibility of a density-dependent increase in fecundity.

reproductive biology of centrophorus cf. uyato from the cayman trench, jamaica

2005 ◽  
Vol 85 (5) ◽  
pp. 1185-1192 ◽  
Author(s):  
donna m. mclaughlin ◽  
john f. morrissey
Keyword(s):  
Reproductive Biology ◽  
Breeding Season ◽  
Mature Female ◽  
Sexual Segregation ◽  
Mature Male ◽  
Sexually Dimorphic ◽  
Total Length ◽  
Over Exploitation

the taxonomy of the genus centrophorus (squaliformes: squalidae) is currently in a great deal of uncertainty. the characteristics of the species subject to the present study most closely resemble those of centrophorus uyato, hence the use of centrophorus cf. uyato, though the species in question may be a species of centrophorus that has not been described previously. specimens were obtained via vertical and horizontal longline at depths of 250–913 m. the reproductive biology of 51 female and 8 male centrophorus cf. uyato were examined. this species is sexually dimorphic, with females attaining a larger size than males. the smallest mature male was 81.2 cm total length whereas the smallest mature female was 91.5 cm total length. females are aplacentally viviparous, with the pups acquiring nutrition via large external yolk sacs, and there was a maximum of two pups per litter. oocytes continued to develop throughout gestation. most females carrying developing embryos had two large (>3.3 cm), equally developed ovarian oocytes, which leads us to believe that they ovulate soon after parturition. this species seems to exhibit complete sexual segregation during the non-breeding season, with mature males absent from the study site during summer months. centrophorus cf. uyato may have one of the lowest fecundities among sharks, giving birth to a maximum of two pups every three years. all species in genus centrophorus have small litters (<6) making them vulnerable to over-exploitation.

scholarly journals Aspects of the reproductive biology of the shortfin mako, Isurus oxyrinchus (Elasmobranchii Lamnidae), in the Southeastern region of Brazil

2002 ◽  
Vol 62 (2) ◽  
pp. 239-248 ◽  
Author(s):  
F. E. S. COSTA ◽  
F. M. S. BRAGA ◽  
C. A. ARFELLI ◽  
A. F. AMORIM
Keyword(s):  
Reproductive Biology ◽  
Tooth Replacement ◽  
Pregnant Females ◽  
Total Length ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Inner Organs ◽  
Near Term ◽  
Southeastern Region

Uteri from four pregnant females and two newborn of shortfin mako, Isurus oxyrinchus, were collected in the southeastern region of Brazil, during September, October, and November of 1993 and 1994. All embryos were near-term with developing dentition and inner organs. Total length ranged from 64.5 to 72.0 cm, and the maximum number of embryos observed in a litter was 20. These observations further confirmed oophagy as a form of nutrition in this species, and its periodicity. The presence of teeth in the embryos' stomachs suggest that tooth replacement begins in the uterine phase.

scholarly journals Effect of lead acetate injection into pregnant mice on the testis function of their male offspring at puberty

2011 ◽  
Vol 5 (2) ◽  
pp. 31-37
Author(s):  
Nisreen Khazal F. ◽  
Ibtisam J. Sodani ◽  
Basima M. Al-Juboori
Keyword(s):  
Normal Saline ◽  
Lead Acetate ◽  
Birth Rate ◽  
Semen Quality ◽  
Sperm Concentration ◽  
Mature Female ◽  
The Body ◽  
Semen Parameters ◽  
Testicular Development ◽  
Pregnant Females

the study aimed to follow up the effects of injection lead acetate into pregnant females on the testicular development and semen quality of their male births at puberty time. Forty mature female Swiss Webster mice (8-10) weeks old were divided into two equal groups (experimental and control). After mating with fertile males, the pregnant females injected intraperitoneally with 0.1 mg/kg of body weight of lead acetate from the first day of gestation and continued throughout the gestation period 20 days. While the control groups were injected by the same dose and rout of injection with normal saline. At parturition, numbers of the neonate were recorded. After six weeks the male births only isolated and weighted then mated with normal fertile females to evaluate their fertility through assessing their birth rate, then sacrificed to get their testes; each testis was weighted and the left one was fixed, then histological sections with a thickness of 5 microns were prepared. The epididymis was minced with warm normal saline to get a spermatozoal suspension to evaluate the sperm concentration, sperm motility, and abnormal sperm morphology and sperm viability. Results showed a highly significant decrease in the body and testicular weights of experimental male animals. A highly significant reduction in their birth rate after mating with normal partners was recorded together with a significant inverse changes in all semen parameters.

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