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💧 Freshwater Endangered 🌡️ Tropical

Magadi tilapia

Oreochromis grahami Boulenger, 1912
Max Length
20 cm
Max Weight
-
Lifespan
-
Trophic Level
2.8
Depth
-
Climate
Tropical
Resilience
High
Vulnerability
27.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Facultative air-breathing ; Occur at temperatures ranging from 16.0-40.0 °C . Feed actively in the evening. Young O. alcalicus grahami eat eggs as they are shed by the female, and much of the time and energy of the territorial male is occupied in driving them off. Feed on invertebrates, at the surface .

Scientific Name
Oreochromis grahami
Authority
Boulenger, 1912
Habitat
Freshwater
Climate
Tropical
Body Shape
Short and / or deep
IUCN Status
EN
Max Length
20 cm
Trophic Level
2.8
Resilience
High
Vulnerability
27.00/100
Water Temp
24–32 °C
Salinity
0–0.5 ppt

🐟 Physical Description

Dorsal spines (total): 11 - 13; Dorsal soft rays (total): 12 - 13; Anal spines: 3; Anal soft rays: 9 - 11; Vertebrae: 28. Mature females with an overall golden hue; males with the flanks a pale blue. Swollen and brilliant white lateral parts of the lower lip of the mature male. Blue spots on scales becoming iridescent. Genital papilla conical, prominent and yellow in the mature male; swollen in the mature female. An oblique eye-bar intensely black in the breeding male, duller in the female.: short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Magadi tilapia is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

Fecundity
3–10eggs

Male prepares a breeding pit, the structure of which may vary with the nature of the substratum. Breeding activities are more actively pursued by both sexes in the morning than in the afternoon. Female lays about 3-10 eggs at a time, picks them up instantly and the male swims with his genital papilla near the mouth, probably emitting sperm. Brooding period reportedly 12-16 days.

🌍 Habitat & Distribution

Freshwater; benthopelagic; pH range: 7.5 - 8.5; dH range: 10 - 20. Tropical; 24°C - 32°C ; 1°S - 2°S

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
2.8±0.28
Food Items

invertebrates, at the surface (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.01862 × L3.02 (TL)
Max TL
20cm
Dorsal Spines
12
Dorsal Rays
13
Anal Spines
3
Anal Rays
10
Vertebrae
28

🌡️ Water Parameters & Tolerance

Temperature Range
24–32°C
pH Range
7.5–8.5
Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Endangered
Assessment Date
2022

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
27.00/100
Low vulnerability
Trophic Level
2.8
Omnivore / Planktivore
Body Shape
Short and / or deep
Climate Zone
Tropical
Described By
Boulenger, 1912

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