scholarly journals The Annual Reproductive Cycle of Rudd, Scardinius erythrophthalmus (Cyprinidae) from the Lower Oder River and Lake Dąbie, (NW Poland)

2020 ◽  
Vol 68 (1) ◽  
pp. 23-33
Author(s):  
Józef Domagała ◽  
Lucyna Kirczuk ◽  
Katarzyna Dziewulska ◽  
Małgorzata Pilecka-Rapacz
Keyword(s):  
Power Plants ◽  
Histological Analysis ◽  
Gonad Development ◽  
Sexual Cycle ◽  
Freshwater Species ◽  
Annual Reproductive Cycle ◽  
Scardinius Erythrophthalmus ◽  
Development Cycle ◽  
Oder River ◽  
North Western

The rudd is a common freshwater species of the European ichthyofauna, however, this species' sexual cycle has not yet been described based on the histological analysis of its gonads. The aim of this study was to analyze the annual gonad development cycle of rudd from the watercourses of north-western Poland. Adult individuals aged 2+ to 13+, of both sexes were caught in the Oder River and Lake Dąbie. A standard paraffin technique and six-stage scales were used to assess the development of gonad maturity in both sexes. Rudd gonads developed similarly in the Oder River and Lake Dąbie. Eggs were deposited in batches from the beginning of May to the half of June. Females deposited at least two batches of eggs. In the majority of females collected from these sites, the gonads developed asynchronously throughout the year. Rudd males attained reproductive readiness in the same period as the females, but retained gametes in their gonads for a month longer than the females. Rudd avoid locations with warmer water discharged from power plants.

Gonad morphology and gametogenesis in the deep-sea jellyfish Atolla wyvillei and Periphylla periphylla (Scyphozoa: Coronatae) collected from Cape Hatteras and the Gulf of Mexico

2009 ◽  
Vol 90 (6) ◽  
pp. 1095-1104 ◽  
Author(s):  
Cathy H. Lucas ◽  
Adam J. Reed
Keyword(s):  
Gulf Of Mexico ◽  
Gonad Development ◽  
Bell Diameter ◽  
Western Atlantic ◽  
Gonad Morphology ◽  
Time Period ◽  
Cape Hatteras ◽  
Literature Evidence ◽  
Long Time ◽  
North Western

Observations on gonad morphology and the structure of ovaries and testes of the coronate scyphozoans Atolla wyvillei and Periphylla periphylla are described based on samples collected from the Gulf of Mexico and Cape Hatteras (north-western Atlantic). In A. wyvillei, gonads of distinguishable sex were observed in medusae as small as 17 mm bell diameter (BD). Spermatogenesis occurred within follicles (average 366 × 254 μm) that were evenly distributed throughout the gonad. Oocytes in different stages of development were observed in all the females with gonads. Oocytes arise from the gastrodermis and migrate into the mesoglea to develop from early-mid to late vitellogenic oocytes characterized by a large nucleus and granular (organic-rich) cytoplasm. The largest oocytes measured were 543 μm and 263 μm from the Gulf of Mexico and Cape Hatteras respectively. Possible reasons for this difference are discussed. In P. periphylla gonads were also initially observed in medusae 17 mm BD, although not all larger medusae had obvious gonads. Unlike A. wyvillei sperm follicles were arranged in long convoluted rows normally only one follicle thick. The organization of ooytes in female P. periphylla was very similar to A. wyvillei, although the gonads were small and the number of oocytes present in each gonad very low (<22). The largest oocyte measured was 777 μm in a 53 mm BD medusa. Although medusae were collected from one time period only (September) in this study, our findings appear to be in agreement with literature evidence indicating that coronate jellyfish produce few eggs continuously over a long time period. Aspects of gonad development and gametogenesis are discussed with respect to potential differences in site productivity and species identification.

On the reproduction of the Mediterranean keystone limpet Patella rustica: histological overview

2014 ◽  
Vol 94 (8) ◽  
pp. 1651-1660 ◽  
Author(s):  
Ivana Prusina ◽  
Daria Ezgeta-Balić ◽  
Stijepo Ljubimir ◽  
Tatjana Dobroslavić ◽  
Branko Glamuzina
Keyword(s):  
Reproductive Cycle ◽  
Shell Length ◽  
Histological Analysis ◽  
Developmental Stages ◽  
Gonad Development ◽  
Gonad Index ◽  
Keystone Species ◽  
Males And Females ◽  
Sexually Mature ◽  
High Shore

The reproductive cycle of the high shore limpet Patella rustica is described based on histological analysis as the primary method of staging gonad development. Sex-ratios, shell length at sexual maturity, gonad developmental stages, mean gonad index and oocyte size were investigated. Males and females were found to differ in size distribution, with females becoming more prevalent from ~28 mm onwards. The estimated shell length at which 50% of males were sexually mature was 13.1 mm. Patella rustica has only one reproductive cycle per year with a spawning peak between November and December for both sexes, and gonad redevelopment from January. First data on the size–frequency analysis of oocytes for this species are also presented, concurring with the qualitative analysis of the gonad developmental stages. This study presents updated information on the reproductive cycle of this keystone species and provides the first account of the reproductive biology of P. rustica in the Adriatic Sea.

scholarly journals Sexuality in Neurospora crassa II. Genes affecting the sexual development cycle

1972 ◽  
Vol 19 (3) ◽  
pp. 205-211 ◽  
Author(s):  
N. V. Vigfusson ◽  
J. Weijer
Keyword(s):  
Neurospora Crassa ◽  
Sexual Development ◽  
Sexual Cycle ◽  
Male Sterile ◽  
Early Stages ◽  
Comparison Of Results ◽  
Development Cycle

SUMMARYEighteen male sterile mutants of N. crassa which block various stages of the sexual development cycle have been functionally categorized on the basis of complementation tests. Nine of these (those which block early stages of the sexual cycle) have also been analysed through recombination studies. On the basis of these data, a minimum of four genes appear to be involved in early stages of sexual development (i.e. probably prior to karyogamy) and several genes are indicated which control later stages of the cycle. Complementation phases with respect to sexual development in heterothallic Ascomycetes are discussed as well as a comparison of results obtained with expectations and with those obtained in related Ascomycetes.

Annual reproductive cycle of the Japanese holothurian Eupentacta chronhjelmi

1994 ◽  
Vol 72 (3) ◽  
pp. 387-396 ◽  
Author(s):  
Maria Antonina B. Catalan ◽  
Masamichi Yamamoto
Keyword(s):  
Reproductive Cycle ◽  
Wall Thickness ◽  
Histological Analysis ◽  
Seawater Temperature ◽  
Annual Reproductive Cycle ◽  
Index Method ◽  
Ambient Seawater ◽  
The Seto Inland Sea ◽  
Gonadal Index ◽  
Inland Sea Of Japan

The reproductive cycle of the small temperate dendrochirote holothurian Eupentacta chronhjelmi was studied in the intertidal zone of Aoshima Island, in the Seto Inland Sea of Japan, from July 1989 to January 1991. Reproductive status was assessed by the gonadal index method and histological analysis of the largest (tertiary) gonadal tubules. The primary and secondary tubules are cryptic and difficult to find, so no reference to the animal's annual cycle in terms of gametogenesis is made. The gonad wall was thickest in September for females and October for males, when the gonadal index was at its peak the rapid final stages of vitellogenesis in females (and completion of spermatogenesis in males) depleted reserves in the gonad wall, producing gametes that were spawned in October to December. When gametes were spawned in December the gonadal index and gonad wall thickness decreased. We suggest that the gonadal index reflects gonadal growth by oocyte production and an increase in gonad wall thickness. In the laboratory, spawning occurred from midnight to 04:00, at ambient seawater temperature (12 °C). Individuals elevated their anterior, oral end, waved their tentacles, and released gametes for about an hour. Based on its large egg size (300 ± 5 μm (mean ± SE) diameter) and low fecundity (1500 ± 10 ripe oocytes per individual), we infer lecithotropic development with an abbreviated larval stage.

The gametogenic cycle and spawning in Mytilus edulis in two fjords in north-western Iceland

2013 ◽  
Vol 93 (6) ◽  
pp. 1609-1615 ◽  
Author(s):  
Gudrun G. Thorarinsdóttir ◽  
Hafsteinn G. Gudfinnsson ◽  
Svanhildur Egilsdóttir ◽  
Jón Örn Pálsson
Keyword(s):  
Mytilus Edulis ◽  
Blue Mussel ◽  
Gonad Development ◽  
Early Spring ◽  
Early Winter ◽  
Gametogenic Cycle ◽  
Summer Maximum ◽  
Annual Gametogenic Cycle ◽  
Short Time ◽  
North Western

The annual gametogenic cycle in the blue mussel, Mytilus edulis L. was investigated from May 2010 to May 2011 in two locations in north-western Iceland. Food availability (chlorophyll-a) was high in early spring at both sites, with a summer maximum in July in Steingrimsfjördur but an autumn maximum in September in Patreksfjördur. Gonad development started in November at both sites, with ripe gametes still visible in the follicles, and continued throughout the year, except for a very short time prior to spawning in Steingrimsfjördur. Gametes developed mostly between November and May. Spawning was protracted, lasting from July to early winter at both sites. The main spawning events occurred from August (11.7°C) to October (9.4°C) in Patreksfjördur, but from July (9.8°C) to October (8.6°C) in Steingrimsfjördur

scholarly journals Testicular structure and spermatogenesis of Amazonian freshwater cururu stingray Potamotrygon cf. histrix

Zygote ◽  
2010 ◽  
Vol 19 (3) ◽  
pp. 245-253 ◽  
Author(s):  
Sérgio Fonseca Zaiden ◽  
Richard Phillip Brinn ◽  
Jaydione Luiz Marcon ◽  
Elisabeth Criscuolo Urbinati
Keyword(s):  
Sertoli Cell ◽  
Germ Cells ◽  
Sertoli Cells ◽  
Natural Environment ◽  
Histological Analysis ◽  
Primordial Germ Cells ◽  
Cartilaginous Fish ◽  
Freshwater Species ◽  
Gamete Formation ◽  
Zonal Organization

SummaryThe cururu stingray Potamotrygon cf. histrix, a new and endemic Amazonian freshwater species, presents appropriate characteristics for fish keeping and is exploited from its natural environment. The present study identified the testicular structure and spermatogenesis of this species. Gonads from adult male specimens were dissected, fixed and processed for histological analysis. The testes were of testicular/epigonial type. The presence of germinal papillae was observed in the upper portion of organ with primordial germ cells and Sertoli cell precursors. The testis was lobular with zonal organization and cystic gametogenesis, with the occurrence of spermatoblasts. The Sertoli cells underwent morphological modifications over the course of gamete formation. The spermatozoids had long heads and were spiraled on their own axis. Information on the reproductive biology will serve as basis for studies on the reproduction and phylogeny of this peculiar group of cartilaginous fish.

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