<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Silver carp, <italic>Hypophthalmichtys molitrix</italic> (Cyprinidae), is the most important freshwater fish in Algerian aquaculture. No natural spawning is observed in Algerian water bodies. This study was conducted with the aim of investigating silver carp reproduction in the wild in Algeria. This investigation can contribute tools to facilitate successful artificial reproduction. Macroscopic and histological analysis of the gonads was conducted, and the monthly distribution of maturity stages and oocyte diameters were monitored in an aggregate sample of 130 male and female silver carp, <italic>H. molitrix</italic>, (450-710 mm total length). The gonadosomatic index (GSI) ranged from 2.76 to 18.88% in females and from 0.34 to 1.85% in males. The female GSI values were the highest from June to August indicating the onset of the spawning season. The histological structures of the gonads revealed five different developmental stages in females and three stages in males. The oogenesis stages were the perinucleolar stage, the yolk vesicle stage, the primary yolk, the secondary yolk, and the tertiary yolk. Migratory nuclei and hydrated oocytes, which are considered to be the maturation stage, were not observed. Three different spermatogenesis phases (immature, maturing, and mature testis) were identified, which included final spermatozoa maturation.</p></abstract>

Silver carp, Hypophthalmichtys molitrix (Cyprinidae), is the most important freshwater fish in Algerian aquaculture. No natural spawning is observed in Algerian water bodies. This study was conducted with the aim of investigating silver carp reproduction in the wild in Algeria. This investigation can contribute tools to facilitate successful artificial reproduction. Macroscopic and histological analysis of the gonads was conducted, and the monthly distribution of maturity stages and oocyte diameters were monitored in an aggregate sample of 130 male and female silver carp, H. molitrix, (450-710 mm total length). The gonadosomatic index (GSI) ranged from 2.76 to 18.88% in females and from 0.34 to 1.85% in males. The female GSI values were the highest from June to August indicating the onset of the spawning season. The histological structures of the gonads revealed five different developmental stages in females and three stages in males. The oogenesis stages were the perinucleolar stage, the yolk vesicle stage, the primary yolk, the secondary yolk, and the tertiary yolk. Migratory nuclei and hydrated oocytes, which are considered to be the maturation stage, were not observed. Three different spermatogenesis phases (immature, maturing, and mature testis) were identified, which included final spermatozoa maturation.

Factors limiting successful reproduction in wild silver carp, <italic>Hypophthalmichtys molitrix</italic>, in Kherrata Reservoir, Algeria

Laboratoire Associé en Écosystèmes Marins et Aquaculture

Faculté des Sciences de la Nature et de la Vie

National Center for Research and Development of Fisheries and Aquaculture (CNRDPA), Division of Aquaculture

Fisheries & Aquatic Life

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Factors limiting successful reproduction in wild silver carp, , in Kherrata Reservoir, Algeria

Silver carp, Hypophthalmichtys molitrix (Cyprinidae), is the most important freshwater fish in Algerian aquaculture. No natural spawning is observed in...

Factors limiting successful reproduction in wild silver carp, Hypophthalmichtys molitrix, in Kherrata Reservoir, Algeria

Published Online: Nov 20, 2019

Page range: 159 - 168

Received: Apr 09, 2018

Accepted: Sep 04, 2019

DOI: https://doi.org/10.2478/aopf-2019-0018

Keywords
Algeria, Kherrata Reservoir, limiting factors, reproduction, seasonal changes

© 2019 Soraya Sadouni et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Factors limiting successful reproduction in wild silver carp, Hypophthalmichtys molitrix, in Kherrata Reservoir, Algeria

Published Online: Nov 20, 2019

Page range: 159 - 168

Received: Apr 09, 2018

Accepted: Sep 04, 2019

DOI: https://doi.org/10.2478/aopf-2019-0018

KeywordsAlgeria, Kherrata Reservoir, limiting factors, reproduction, seasonal changes

© 2019 Soraya Sadouni et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Algeria, Kherrata Reservoir, limiting factors, reproduction, seasonal changes