Physiological changes in male and female pikeperch Sander lucioperca (Linnaeus, 1758) subjected to different photoperiods and handling stress during the reproductive season

2013 ◽  
Vol 39 (5) ◽  
pp. 1253-1266 ◽  
Author(s):  
Sara Pourhosein Sarameh ◽  
Bahram Falahatkar ◽  
Ghobad Azari Takami ◽  
Iraj Efatpanah
Keyword(s):  
Reproductive Season ◽  
Physiological Changes ◽  
Sander Lucioperca ◽  
Handling Stress ◽  
Male And Female

Performance of Tripfoid Pacific Oysters, Crassostrea gigas: Gametogenesis

1990 ◽  
Vol 47 (6) ◽  
pp. 1213-1222 ◽  
Author(s):  
Standish K. Allen Jr. ◽  
Sandra L. Downing
Keyword(s):  
Crassostrea Gigas ◽  
Cytochalasin B ◽  
Reproductive Season ◽  
Sexual Expression ◽  
Male And Female ◽  
Pacific Oysters ◽  
Gamete Formation

Triploid Pacific oysters, Crassostrea gigas, were produced by treating newly fertilized eggs with cytochalasin B. After a year of growth, diploid and triploid oysters were sampled throughout the reproductive season to determine the effect of triploidy on gamete formation and sexual expression. Relative to diploids, gametogenesis in triploids was retarded but not absent: both male and female triploids produced some gonad. Gametogenesis in most triploid males resulted in spermatid production; all triploid males produced numerous spermatocytes. Oocyte formation in most triploid females was severely retarded, although some triploid females produced numerous eggs. Hermaphroditism in the triploid population was markedly higher than in diploids: 29 versus 1%, respectively. The ratio of males:females was the same in diploids and triploids.

scholarly journals Biological parameters of Pseudocurimata boulengeri (Characiformes: Curimatidae) inhabiting the Chongón dam, Ecuador

2016 ◽  
Vol 64 (1) ◽  
pp. 131
Author(s):  
David Chicaiza Veloz ◽  
Héctor Flores
Keyword(s):  
Gonad Development ◽  
Biological Data ◽  
Reproductive Season ◽  
Spawning Season ◽  
Male And Female ◽  
Lentic System ◽  
High Production ◽  
First Maturity ◽  
Size At First Maturity ◽  
Production Characteristics

Pseudocurimata boulengeri is an endemic species of Ecuador, which sustains a large group of fisher families. The biological data of this species correspond to reports from lotic systems of Los Ríos province; nevertheless, their trend in a lentic system is not yet known. This paper describes the sex ratio, length-weight relationship, gonad development, spawning season and size at reproductive maturity of P. boulengeri, inhabiting the lentic system of Chongón dam, Ecuador. Fish were caught between 2003 and 2009 using gill nets (2.5"). The total length (Lt) of caught specimens ranged from 10.5 to 35.5 cm, spawning occurred between the months of October and March, and size at first maturity for females was estimated at 17.9 cm (Lt) and 20.0 cm (Lt) for males. Between May and October male and female ratios were as expected (1:1), whereas for May, November and April, females ratios were higher than males, situation that coincided with the spawning season. The limnetic conditions and high production characteristics of Chongón dam, have promoted the availability of a great amount of food for this species, which may have allowed P. boulengeri to have a more extended reproductive season in this favorable environment.

scholarly journals Characterization of Sialic Acid-Binding Immunoglobulin-Type Lectins in Fish Reveals Teleost-Specific Structures and Expression Patterns

Cells ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 836
Author(s):  
Kim F. Bornhöfft ◽  
Joan Martorell Ribera ◽  
Torsten Viergutz ◽  
Marzia T. Venuto ◽  
Ulrike Gimsa ◽  
...  
Keyword(s):  
Sialic Acid ◽  
Expression Profiles ◽  
Expression Patterns ◽  
Sander Lucioperca ◽  
Handling Stress ◽  
Sialic Acid Binding ◽  
Specific Manner ◽  
Genes Encoding ◽  
Myelin Associated Glycoprotein

The cellular glycocalyx of vertebrates is frequently decorated with sialic acid residues. These sialylated structures are recognized by sialic acid-binding immunoglobulin-type lectins (Siglecs) of immune cells, which modulate their responsiveness. Fifteen Siglecs are known to be expressed in humans, but only four Siglecs are regularly present in fish: Siglec1, CD22, myelin-associated glycoprotein (MAG), and Siglec15. While several studies have dealt with the physiological roles of these four Siglecs in mammals, little is known about Siglecs in fish. In the present manuscript, the expression landscapes of these Siglecs were determined in the two salmonid species Oncorhynchus mykiss and Coregonus maraena and in the percid fish Sander lucioperca. This gene-expression profiling revealed that the expression of MAG is not restricted to neuronal cells but is detectable in all analyzed blood cells, including erythrocytes. The teleostean MAG contains the inhibitory motif ITIM; therefore, an additional immunomodulatory function of MAG is likely to be present in fish. Besides MAG, Siglec1, CD22, and Siglec15 were also expressed in all analyzed blood cell populations. Interestingly, the expression profiles of genes encoding Siglecs and particular associated enzymes changed in a gene- and tissue-specific manner when Coregonus maraena was exposed to handling stress. Thus, the obtained data indicate once more that stress directly affects immune-associated processes.

BIOLOGICAL CHARACTERISTICS OF SIRES AND REARING JUVENILS OF PIKEPERCH STOCKED UP FOR REPRODUCTION IN THE KAPCHAGAI WATER RESERVOIR

2017 ◽  
pp. 96-104
Author(s):  
Kuanysh Baibulatovich Isbekov ◽  
Saya Kashkinbayevna Koyshibaeva ◽  
Evgeniy Victorovich Fedorov
Keyword(s):  
Reliability Assessment ◽  
Water Reservoir ◽  
The Body ◽  
Fish Scale ◽  
Morphometric Characteristics ◽  
Sander Lucioperca ◽  
Male And Female ◽  
Scale Reliability ◽  
Maximum Body ◽  
Biological Statistics

The purpose of research is determining the terms of spawning, age and morphometric characteristics of sires and rearing stocks of pikeperch ( Sander lucioperca ) gathered in one of the inlets of the Kapchagai water reservoir in 2012-2014. There were measured the mass, overall and commercial length, thickness and height of the body, head length, height of caudal paduncle, maximum body circumference. Fatness was determined, according to Fulton. To determine age there was used fish-scale. Reliability assessment of distinctions in dimensions was carried out by means of biological statistics. The terms of beginning (11-15 April) and end (20-22 April) of pikeperch spawning have been determined. The age of sires at catch is 5-9 years. There has been revealed the absence of essential dimensional distinctions in male and female pikeperch species; however, there were found distinctions in the side groups. Size indexes values of pikeperch sires from the investigated region of the Kapchagai water reservoir demonstrate polymorphism of pikeperch sires. The data obtained allow to plan rearing pikeperch juveniles breeding at all stages of production process.

Effects of different photoperiods and handling stress on spawning and reproductive performance of pikeperch Sander lucioperca

2012 ◽  
Vol 132 (3-4) ◽  
pp. 213-222 ◽  
Author(s):  
Sara Pourhosein Sarameh ◽  
Bahram Falahatkar ◽  
Ghobad Azari Takami ◽  
Iraj Efatpanah
Keyword(s):  
Reproductive Performance ◽  
Sander Lucioperca ◽  
Handling Stress

scholarly journals Physiological characteristics associated with increased resistance to decompression sickness in male and female rats

2020 ◽  
Vol 129 (3) ◽  
pp. 612-625
Author(s):  
Jacky Lautridou ◽  
Emmanuel Dugrenot ◽  
Aline Amérand ◽  
Anthony Guernec ◽  
Karine Pichavant-Rafini ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Rat Model ◽  
Selective Breeding ◽  
Decompression Sickness ◽  
Female Rats ◽  
Physiological Changes ◽  
Male And Female ◽  
Male And Female Rats ◽  
Leukocyte Counts ◽  
Components Analysis

By selective breeding of individuals resistant to decompression sickness (DCS) we previously obtained a rat model of inherited resistance to this pathology. Comparison of these individuals with nonresistant animals revealed differences in leukocyte counts, coagulation, and mitochondrial and vascular functions, but not resistance to oxidative stress. This study also reveals sex-related differences in the physiological changes associated with DCS resistance. A principal components analysis of our data allowed us to discriminate DCS-resistant males from standard ones, but not females. These differences represent possible mechanisms driving resistance to DCS. Although still far from the diver, this opens a pathway to future adaptation of personalized decompression procedures for “DCS-prone” individuals.

Physiological changes during copulation in male and female stumptail macaques (Macaca arctoides)

1986 ◽  
Vol 38 (6) ◽  
pp. 891-895 ◽  
Author(s):  
A.K. Slob ◽  
W.H. Groeneveld ◽  
J.J. Van Der Werff Ten Bosch
Keyword(s):  
Physiological Changes ◽  
Macaca Arctoides ◽  
Male And Female
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