الفهرس 
Aim of the workOnly 14 pages are availabe for public view
 |  | from | 115 |  |  |
| | | from | 115 | | |
Abstract
Summary
Tilapias originated from Africa and the Middle East, and they are very
popular for aquaculture production. They have been introduced with culture
farms in all continents except Antarctica, in more than 90 countries over the
world.
O. niloticus is the most dominant cultured species across the world,
although several other species of tilapia are cultured for commercial purpose.
Consequently, studying the environmental and biological conditions related to
the improvement of tilapian production have a special interest.
This study aimed to infer the effect of climate change, as an effective
ecological variable for poikilothermic animals such as fishes, on the biology of
Nile tilapia either adults from a natural resource (Bahr Shebeen Canal) or fries
obtained from a Fish Hatchery (Al-Madina, Kafr El Sheikh, Egypt) and kept
under controlled rearing conditions.
The following findings were predicted:
Natural resource part:
A 360 adult O. niloticus specimens: 236 males and 124 females were
collected from Bahr Shebeen Canal (BSC) in the period from February 2018 to
January 2019.
Growth:
1. There was a high association of length-length relationship for both sexes.
2. Males and females had a negative allometric pattern of growth according
to their b values (below 3).
3. The seasonal variations of length-weight relationship reached the highest
value in autumn for males and in summer for females