scholarly journals Duration of chilling phase, but not thermal condition, influence the gonad maturation of male and female domesticated pikeperch ( Sander lucioperca )

2021 ◽  
Author(s):  
Sylvain Milla ◽  
Amine Khendek ◽  
Daniel Zarski ◽  
Yannick Ledoré ◽  
Imen Ben Ammar ◽  
...  
Keyword(s):  
Thermal Condition ◽  
Gonad Maturation ◽  
Sander Lucioperca ◽  
Male And Female

Variations in fatty acids composition of pikeperch (Sander lucioperca) liver with respect to gonad maturation

2006 ◽  
Vol 15 (4) ◽  
pp. 441-445 ◽  
Author(s):  
K. Uysal ◽  
A. Yerlikaya ◽  
M. Y. Aksoylar ◽  
M. Yöntem ◽  
M. Ulupinar
Keyword(s):  
Fatty Acids ◽  
Gonad Maturation ◽  
Fatty Acids Composition ◽  
Sander Lucioperca

scholarly journals PEMIJAHAN IKAN LELE DENGAN TEKNIK PEMIJAHAN ALAM (NATURAL SPAWNING) DAN PEMIJAHAN SEMI ALAMI (INDUCED SPAWNING)

2019 ◽  
Vol 2 (2) ◽  
pp. 59-66
Author(s):  
Pungky Slamet Wisnu Kusuma ◽  
Sukarjati Sukarjati ◽  
Tony Susilo Wibowo
Keyword(s):  
Low Income ◽  
Mass Production ◽  
Gonad Maturation ◽  
Male And Female ◽  
Knowledge And Skills ◽  
Induced Spawning ◽  
Natural Spawning

The desire of the Sumber Rejeki catfish farmer group to do their own hatchery, but often failures, this causes low income and is not continuous. In addition, the groups of farmers also want to increase their knowledge and skills related to the procedures for spawning catfish naturally and semi-naturally until catfish seeds are ready for sale. The aim of training and mentoring is to find a breakthrough solution for easy-to-use technology to spur gonad maturation, accelerate spawning and mass production of seeds in a continuous and continuous manner with laserpuncture induction technology. Measuring the success of training and mentoring participants can operate the laserpuncture unit correctly, can determine the location of the reproductive acupoint correctly and can induce male and female catfish parents with laserpuncture technology correctly and the catfish parent induced by laserpuncture can mature gonads, quickly spawning and producing catfish seeds in bulk and continuously that are ready for sale.

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.

Maturity and sexuality in Barramundi, Lates calcarifer (Bloch), in the Northern Territory and south-eastern Gulf of Carpentaria

1982 ◽  
Vol 33 (3) ◽  
pp. 529 ◽  
Author(s):  
TLO Davis
Keyword(s):  
Growth Rate ◽  
Northern Territory ◽  
Gonad Maturation ◽  
Lates Calcarifer ◽  
Male And Female ◽  
South Eastern ◽  
Sex Inversion ◽  
Post Spawning ◽  
First Maturity

The histological events associated with gonad maturation in male and female L. calcarifer are described. Females are normally derived from post-spawning males. A histological description of the process of sex inversion is presented. The lengths of males at first maturity in the Northern Territory and south-eastern Gulf of Carpentaria were 600 and 550 mm, respectively. Most fish were changing sex at lengths of 900 and 850 mm, respectively in these areas. These size differences were due to a slower growth rate of barramundi in the Gulf of Carpentaria, both processes being related to age rather than to size.

scholarly journals ASPEK BIOLOGI DAN PARAMETER PERTUMBUHAN IKAN LAYANG (Decapterus russelli, Rupell, 1928) DIPERAIRAN SELAT MALAKA

2019 ◽  
Vol 11 (3) ◽  
pp. 175
Author(s):  
Ria Faizah ◽  
Lilis Sadiyah
Keyword(s):  
Sex Ratio ◽  
Growth Parameter ◽  
Growth Patterns ◽  
Purse Seine ◽  
Maturation Stage ◽  
Gonad Maturation ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Male And Female ◽  
Fish Samples

Ikan Layang (Decapterus russelli, Rupell, 1928) merupakan salah satu ikan pelagis kecil bernilai ekonomis penting di perairan Selat Malaka. Ikan ini banyak tertangkap oleh alat tangkap purse seine. Tujuan penelitian ini adalah untuk mengetahui beberapa aspek biologi dan parameter pertumbuhan ikan Layang yang tertangkap purse seine di perairan Selat Malaka. Penelitian ini dilaksanakan selama bulan April hingga September 2016. Informasi yang disajikan oleh studi ini meliputi: hubungan panjang berat, faktor kondisi, rasio kelamin, tingkat kematangan gonad dan parameter pertumbuhan. Parameter pertumbuhan diperoleh dari data frekuensi panjang bulanan dan dianalisis dengan ELEFAN I dalam program FiSAT II, nisbah kelamin dianalisis menggunakan uji chi-kuadrat dan TKG ditentukan secara morfologi. Ikan Layang yang diperoleh selama penelitian sebanyak 958 ekor dengan kisaran ukuran antara 8,4-28,7 cmFL dan nisbah kelamin antara jantan dan betina yaitu 1:1,01. Pola pertumbuhan panjang-bobot ikan Layang jantan dan betina bersifat allometrik positif dengan mengikuti persamaan W=0,0057L3,2984 (R2=0,9745) untuk jantan dan W=0,0079L3,183 (R2=0,9825) untuk Layang betina. Kisaran faktor kondisi ikan Layang antara 0,97-1,67.Ikan Layang yang diamati mempunyai TKG I sampai dengan IV dengan nilai IKG 0,056– 6,36 % untuk ikan jantan dan 0.103 – 6,044 % untuk ikan betina. Persamaan kurva pertumbuhan Von Bertalanffy ikan Layang di Selat Malaka yaitu Lt =24,25 (1 - e 1,03(t+-0.163)) dengan panjang asimtotik (L∞) =24,25 cmFL, koefisien pertumbuhan (K) = 1,03 per tahun dengan umur teoritis (t0) = - 0,163. Ukuran rata-rata tertangkap (L50% = Lc) untuk ikan Layang adalah 16,21cmFL.Indianscad (Decapterus russelli, Rupell, 1928) is one of small pelagic fish that have economic values in The Malacca straits. This fish is caught by purse seine. The aim of this research were to assess several aspects of biolocal reproduction and growth parameter for Indianscad caught by purse seine in the Malacca straits. This research was conducted from April to September 2016. Information resulted from this study consisted of length weight relationship, condition factor, sex ratio, gonad maturation stage and growth parameter. Growth parameter used the ELEFAN I method by using FiSAT II software, sex ratio was analyzed using Chi-Square and gonad maturation stage by using morphology. This study used 958 fish samples with size between 8,4-28,7 cmFL and the sex ratio between male and female was 1:1,01. The growth patterns of Indian scad for male and female were negative allometric expressed by the following equation: W=0,0057L3,2984 (R2=0,9745) for male and W=0,0079L3,183 (R2=0,9825) for female. The condition factors were about 0,65-1,67.Indianscads observedranged between TKG I and TKG IV with IKG for male and female were 0.056– 6,36 % and 0.103 – 6,044 %, respectively. The Von Bertalanffy Growth Equation of Indian scad in Malacca straits was Lt =24,25 (1 - e 1,03(t+-0.163)) with the asymptotic length (L∞) =24,25 cmFL, growth coefficient (K) = 1,03 per year and the theoretical age (t0) Indian scad that was equal to (t0) = - 0,163. Length at first capture of Indian scad (Lc) was 16,21cmFL.

The Clinical, Roentgenological and Morphological Effects of an Acute Exposure of Phosgene on the Lungs of Dogs

1971 ◽  
Vol 29 ◽  
pp. 236-237
Author(s):  
R. F. Bils ◽  
W. F. Diller ◽  
F. Huth
Keyword(s):  
Latent Period ◽  
Chemical Industry ◽  
Toxic Substance ◽  
Lung Edema ◽  
X Rays ◽  
Beagle Dogs ◽  
Male And Female ◽  
Morphological Alterations ◽  
Before And After ◽  
Electron Microscopes

Phosgene still plays an important role as a toxic substance in the chemical industry. Thiess (1968) recently reported observations on numerous cases of phosgene poisoning. A serious difficulty in the clinical handling of phosgene poisoning cases is a relatively long latent period, up to 12 hours, with no obvious signs of severity. At about 12 hours heavy lung edema appears suddenly, however changes can be seen in routine X-rays taken after only a few hours' exposure (Diller et al., 1969). This study was undertaken to correlate these early changes seen by the roengenologist with morphological alterations in the lungs seen in the'light and electron microscopes.Forty-two adult male and female Beagle dogs were selected for these exposure experiments. Treated animals were exposed to 94.5-107-5 ppm phosgene for 10 min. in a 15 m3 chamber. Roentgenograms were made of the thorax of each animal before and after exposure, up to 24 hrs.

Ultrastructural investigation of spontaneous pituitary gonadotroph cell adenomas in aging Sprague-Dawley rats

1983 ◽  
Vol 41 ◽  
pp. 702-703
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Epoxy Resin ◽  
Immunoelectron Microscopy ◽  
Tumor Type ◽  
Gonadal Function ◽  
Sprague Dawley ◽  
Male And Female ◽  
Reticulin Fibers ◽  
Sprague Dawley Rats

Gonadotroph cell adenomas of the pituitary are infrequent in human patients and are not invariably associated with altered gonadal function. To date, no animal model of this tumor type exists. Herein, we describe spontaneous gonadotroph cell adenomas in old male and female Sprague-Dawley rats by histology, immunocytology and electron microscopy.The material consisted of the pituitaries of 27 male and 38 female Sprague Dawley rats, all 26 months of age or older, removed at routine autopsy. Sections of formal in-fixed, paraffin-embedded tissue were stained with hematoxylin-phloxine-saffron (HPS), the PAS method and the Gordon-Sweet technique for the demonstration of reticulin fibers. For immunostaining, sections were exposed to anti-rat β-LH, anti-ratβ-TSH, anti-rat PRL, anti-rat GH and anti-rat ACTH 1-39. For electron microscopy, tissue was fixed in 2.5% glutaraldehyde, postfixed in 1% OsO4 and embedded in epoxy-resin. Tissue fixed in 10% formalin, embedded in epoxy resin without osmification, was used for immunoelectron microscopy.

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