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LIST OF ABBREVIATIONS
The list of figure legends
Figure 1 :A map of bluefin tuna fishing areas in the Algerian coast.
Figure 2 :Conceptual diagram of environmental data extraction.
Figure 3: Abundances of thunnus thynnus according to seasons.
Figure 4 :Correlation circle between variables biotic and abiotic.
Figure 5 : Biometric correlation in Thunnus thynnus.
Figure 6: Seasonal variation of physical factors : temperature and salinity.
Figure7: Seasonal variations in bluefin tuna abundances and mean lengths in relation to
environmental factors, temperature
Figure 8: Seasonal variations in bluefin tuna abundances and mean lengths in relation to
environmental factors, salinity.
Figure 9: Seasonal variations in bluefin tuna abundances in relation to environmental factors :
Chlorophyll a, Current speed, Wave height, and nitrate (NO3).
Figure 10: Seasonal variations in bluefin tuna abundances and mean lengths in relation to
environmental factors, current speed.
Figure 11: Seasonal variations in bluefin tuna abundances and mean lengths in relation to
environmental factors, wave height.
Figure 12 Seasonal variation of the two factors: Temperature and dissolved oxygen.
Figure 13: Seasonal variations in bluefin tuna abundances and mean lengths in relation to
environmental factors, dissolved oxygen.
Figure 14: Seasonal variations in bluefin tuna abundances and mean lengths in relation to
environmental factors, chlorophyll (a)
ANOVA
analysis of variance
Avr
Average
BFT
blue fine tuna
Chl a
chlorophyll a
Crrt-spd
current speed
CV
coefficient of variation
Dev-str
standard deviation
Dist_cot
distance from the coast
Ht Vg
wave height
IC
Confidence interval
ICCAT
International commission for the conservation of atlantic tunas
Lt
Total length
MAX
Maximum
MIN
Minimum
N
Sample size
NO3
Nitrate
O2
Oxygen
PCA
Principal Component Analysis
S
Salinity
T
Temperature
Wt
total weight
QGIS
quantum geographic information system