A Study of Age, Sex Ratio, Gonado-Somatic Index, Fecundity, and Breeding Season, of Nile Tilapia (Oreochromis niloticus Linnaeus, 1758) from Khashm El-Girba Reservoir and Atbara River, Eastern Sudan
Mutasim Yousif Mohamed Abdalla, Abu Elgasim Ibrahim Abd Elhalim, Mujtaba El Khair Shuaib, Abdalla Mustafa Hamid, Noha Ahmed Sati, Moatez Mohammed Elhassan, Ahmed El-Bedawi Adam
Asian Journal of Research in Zoology · pp. 28–46 · Published 12 Jun 2024
10.9734/ajriz/2024/v7i3154Abstract
This study aims to investigate some reproductive aspects of Nile tilapia, Oreochromis niloticus in the Khashm El-Girba reservoir and Atbara River, eastern Sudan. The study was conducted during December 2015 to November 2016. Samples were collected bi-monthly basis from three localities, namely; Um Aswad (Atbara River), El-Remila, and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2 cm 4.0 cm and 7.0 cm stretched mesh. A total of 1595 O. niloticus specimens were collected from all sampling sites. The age of O. niloticus was estimated using five anterior vertebrae of fish body; The results indicate that the age ranged between 0+ to 4+ years. Most of the collected fish specimens were of age 1+, with females most dominant at this age. Sex ratio was 1:1(M: F). Gonado-somatic index (GSI) of females of O. niloticus ranged between 1.965 – 2.620, and from 0.434 – 0.439 for males. Two periods of increase of GSI were observed reflecting two breeding seasons of this species. Used gravimetric method to estimate the average fecundity of O. niloticus ranged between 481 eggs in Um Aswad sampling site, and 638 in El-Remila site. The fecundity of O. niloticus has a high correlation with gonadal weight (r=0.82708) but a low correlation with standard length (r=0.47612) and total weight (r=0.50874). The results of this investigation on O. niloticus indicate that the age of the fish ranged from 0+ to 4+ years, with a sex ratio of 1:1. The Gonado-somatic Index (GSI) indicated two spawning seasons, and fecundity was found to be strongly correlated with gonad weight, and moderately correlated with total length and standard length. This results can be used formulate management policies and procedures for protecting and conserving the fisheries resources and to regulate and improve the catches of the most important commercial fish species in that region.
Cited by 3
Dwivedi Amitabh Chandra, Mishra N · International Journal of Aquaculture and Fishery Sciences · 2024
Parameswaran Hariharan, Eswaran Suresh, Pushparaj Chidambaram · Journal of Fish Biology · 2026
Showing 2 of 3 known citations — external sources report more than can currently be individually listed.
Related research
- Colorectal Cancer Risk and Prevention Knowledge among Adults Attending Public Health Facilities in Obudu, Cross River State, Nigeria — shares topic coverage
- Awareness of Causes and Health Risks Associated with High Blood Cholesterol among Men in Awka Etiti, Anambra State, Nigeria — shares topic coverage
- Effects of Age and Sex on the Healing of Acetic-Acid Induced Ulcerative Colitis in Adult Wistar Rats — shares topic coverage
- Demographic Factors and Bystander CPR in Nigerian Athletes — shares topic coverage
- Impact of Age and Marital Status of Orthodontic Patients on their Satisfaction with Duration of Treatment, Perception and Attitude towards Accelerated Orthodontics — shares topic coverage
Article metrics
Real usage data collected on this platform.
0
Page views
0
PDF downloads
0
Outbound clicks
3
Citations
Views by country
Approximate, from request IP at view time — not citizenship or institution. Countries with fewer than 5 views are grouped as "Other".
No views recorded yet.
Traffic sources
Referring site, by host.
No traffic recorded yet.
Views and downloads exclude known bots/crawlers. Citations combines this platform's own DOI-resolved index with each external source's own reported total — see Cited by above for individually listed citing works. Last refreshed 0 seconds ago.