vii
Listes des figures
Liste des tableaux
Sommaire
Introduction ···································································································· 1
Chapitre 1 : Généralités 3
1.Présentation de la zone d’étude : le littoral algérien ····················································· 3
1.1.Mer d’Alboran ······························································································ 4
1.2.Le bassin Algéro-provençal ··············································································· 5
1.3.Le port de Ghazaouet ······················································································ 5
2.Présentation de la famille des Macrouridae ································································ 6
2.1. Position systématique et caractères taxonomique des Macrouridae ·································· 7
2.2. Description de Coelorinchus caelorhincus ······························································ 8
Chapitre 2 : Matériel et méthodologie 9
1.Echantillonnage et traitements ·············································································· 9
1.1. Echantillonnage ····························································································· 9
1.2. Mensurations et pesées ···················································································· 9
2.Caractéristiques du stock ··················································································· 10
3. Indices biologiques ························································································ 10
3.1. Sex-ratio ··································································································· 10
3.2. Coefficient Q de Fulton ··················································································· 11
4. Étude du régime alimentaire ·············································································· 11
4.1. Observation et identification des proies ································································ 11
4.2. Analyse du régime alimentaire································ ································ ·········· 13
4.2.1. Analyse qualitative ······················································································ 13
4.2.2. Analyse quantitative : les indices numériques ······················································· 13
a. Le coefficient de vacuité « V » ································ ································ ············ 13
b. La fréquence des proies « F » ································ ································ ············· 13
c. Pourcentage en nombre « Cn » ································ ································ ············ 14
d. Le nombre moyen de proies par estomac « Nm » ································ ························ 14
Listes des figures
Liste des tableaux
Sommaire
Introduction ···································································································· 1
Chapitre 1 : Généralités 3
1.Présentation de la zone d’étude : le littoral algérien ····················································· 3
1.1.Mer d’Alboran ······························································································ 4
1.2.Le bassin Algéro-provençal ··············································································· 5
1.3.Le port de Ghazaouet ······················································································ 5
2.Présentation de la famille des Macrouridae ································································ 6
2.1. Position systématique et caractères taxonomique des Macrouridae ·································· 7
2.2. Description de Coelorinchus caelorhincus ······························································ 8
Chapitre 2 : Matériel et méthodologie 9
1.Echantillonnage et traitements ·············································································· 9
1.1. Echantillonnage ····························································································· 9
1.2. Mensurations et pesées ···················································································· 9
2.Caractéristiques du stock ··················································································· 10
3. Indices biologiques ························································································ 10
3.1. Sex-ratio ··································································································· 10
3.2. Coefficient Q de Fulton ··················································································· 11
4. Étude du régime alimentaire ·············································································· 11
4.1. Observation et identification des proies ································································ 11
4.2. Analyse du régime alimentaire································ ································ ·········· 13
4.2.1. Analyse qualitative ······················································································ 13
4.2.2. Analyse quantitative : les indices numériques ······················································· 13
a. Le coefficient de vacuité « V » ································ ································ ············ 13
b. La fréquence des proies « F » ································ ································ ············· 13
c. Pourcentage en nombre « Cn » ································ ································ ············ 14
d. Le nombre moyen de proies par estomac « Nm » ································ ························ 14