Mohamed Lamine Haddadi
*
& Farid Hemida
National high school of marine sciences and coastal management (Laboratory for Conservation and Valorization of Marine Resources).
University Campus of Dely Ibrahim Bois des Cars, Dély Ibrahim 16320. *(lmn.haddadi@gmail.com)
Abstract. The shamefaced crab Calappa granulata (Linnaeus, 1758) is a species known from the Mediterranean Sea and east Atlantic from
Portugal to Mauritania, including the Azores, Madeira, the Canary Islands, and the Cape Verde Islands. Recorded in Algeria by several authors,
the shame-faced crab represents the main species of brachyuran crustaceans, found in the eastern Algerian fisheries. The growth study of the
shame-faced crab’s population, in the eastern part of the coast, is realized for the first time through this study. The latter was based on three years
of sampling (2016-2018). The length-weight relationship shows that the growth of this species follows a negative allometry. The estimated
growth parameters for this species using ELEFAN program are L∞ = 102.5 mm and K = 0.31 yr
-1
. According to the former, the asymptotic
weight is 406.7 g. Mortality parameters calculated based on the growth parameters obtained for the population of C. granulata of the area are
M = 0.41 yr
-1
, Z = 1.94 yr
-1
and F = 1.53 yr
-1
.
Keywords: Growth parameters , mortality , Brachyura , Calappa granulata , Algerian coast.
Résumé. Le crabe honteux Calappa granulata (Linnaeus, 1758) est une espèce existante dans la méditerranée et l’atlantique Est allant du
Portugal à la Mauritanie, comprenant les Açores, Madère, les îles canaries et le cap vert. Signalé en Algérie par plusieurs auteurs, le crabe
honteux est la principale espèce de crustacés brachyoures débarqués dans les pêcheries algériennes de la région Est. L’étude de la croissance
de la population du crabe honteux dans la partie orientale du bassin algérien a été réalisée pour la première fois et a été effectuée sur la base
d’un échantillonnage qui s’est étalé sur une période de trois ans (2016-2018). La relation taille-poids montre que la croissance de cette espèce
suit une allométrie minorante. Les paramètres de croissance estimés pour cette espèce à l’aide du programme ELEFAN sont (L∞ = 102,5 mm,
K = 0,31 an
-1
). Le poids asymptotique a été estimé à partir de la longueur asymptotique à 406,7 g. Les paramètres de mortalité calculés sur la
base des paramètres de croissance obtenus pour la population de C. granulata dans cette partie du bassin algérien sont (M = 0,41 an
-1
,
Z = 1,94 an
-1
, F = 1,53 an
-1
).
Mots Clés: Paramètres de croissance , Mortalité , Brachyoures , C. granulata , Bassin algérien.
INTRODUCTION
The shamefaced crab Calappa granulata (Linnaeus, 1758)
is a sublittoral species known from the Mediterranean Sea
and adjacent Atlantic Ocean from Portugal to Mauritania,
including the Azores, Madeira, the Canary Islands, and the
Cape Verde Islands (Manning & Holthuis 1981, Števcic
1990). It was recorded in Algeria by several authors (Santucci
1930, Délye 1957, Grimes 2004). This benthic species
lives buried in sand or silt sediments (García Raso 1984).
It is the main species of brachyuran crustaceans, found in
Algerian fisheries related to the eastern area of the coast.
No study of growth or mortality parameters of C. granulata
belonging to the Mediterranean Sea’s stock was carried out
before. The purpose behind this study is to evaluate growth
and mortality parameters of this crab species in this specific
area. After prospecting fisheries along the Algerian coast,
it was concluded that Calappa granulata is landed in large
quantities in the east compared to the center and the west, and
for that, the study was restricted to this area. The most recent
descriptive study of C. granulata was conducted by P. Noël
(2013). The description was achieved also by several authors
including Fischer et al. (1987).
MATERIAL AND METHODS
Sampling and area Study
The related observations were made on collected samples from
the eastern Algerian coast, between 2016 and 2018 (Fig. 1). A
total of 233 specimens of Calappa granulata were examined.
Specimens were sexed; also measurements of cephalothoracic
length (CL) were recorded to the nearest millimeters (Fig. 2),
as well as total weight (TW) to the nearest 0.01g.
Figure 1. Map of the Algerian coast indicating western (A), central
(B) and eastern (C) areas.
e-ISSN : 1114-6834
Bulletin de l’Institut Scientifique, Rabat, Section Science de la vie , 2019, n° 41, 1-5
Growth and assessment parameters of Calappa granulata (Crustacea ; Decapoda ;
Brachyura) in the eastern Algerian coast (Southern Mediterranean Sea)
Paramètres de croissance et d’exploitation de Calappa granulata (Crustacés ;
Décapodes ; Brachyoures) dans le bassin algérien oriental (Méditerranée Sud)
*
& Farid Hemida
National high school of marine sciences and coastal management (Laboratory for Conservation and Valorization of Marine Resources).
University Campus of Dely Ibrahim Bois des Cars, Dély Ibrahim 16320. *(lmn.haddadi@gmail.com)
Abstract. The shamefaced crab Calappa granulata (Linnaeus, 1758) is a species known from the Mediterranean Sea and east Atlantic from
Portugal to Mauritania, including the Azores, Madeira, the Canary Islands, and the Cape Verde Islands. Recorded in Algeria by several authors,
the shame-faced crab represents the main species of brachyuran crustaceans, found in the eastern Algerian fisheries. The growth study of the
shame-faced crab’s population, in the eastern part of the coast, is realized for the first time through this study. The latter was based on three years
of sampling (2016-2018). The length-weight relationship shows that the growth of this species follows a negative allometry. The estimated
growth parameters for this species using ELEFAN program are L∞ = 102.5 mm and K = 0.31 yr
-1
. According to the former, the asymptotic
weight is 406.7 g. Mortality parameters calculated based on the growth parameters obtained for the population of C. granulata of the area are
M = 0.41 yr
-1
, Z = 1.94 yr
-1
and F = 1.53 yr
-1
.
Keywords: Growth parameters , mortality , Brachyura , Calappa granulata , Algerian coast.
Résumé. Le crabe honteux Calappa granulata (Linnaeus, 1758) est une espèce existante dans la méditerranée et l’atlantique Est allant du
Portugal à la Mauritanie, comprenant les Açores, Madère, les îles canaries et le cap vert. Signalé en Algérie par plusieurs auteurs, le crabe
honteux est la principale espèce de crustacés brachyoures débarqués dans les pêcheries algériennes de la région Est. L’étude de la croissance
de la population du crabe honteux dans la partie orientale du bassin algérien a été réalisée pour la première fois et a été effectuée sur la base
d’un échantillonnage qui s’est étalé sur une période de trois ans (2016-2018). La relation taille-poids montre que la croissance de cette espèce
suit une allométrie minorante. Les paramètres de croissance estimés pour cette espèce à l’aide du programme ELEFAN sont (L∞ = 102,5 mm,
K = 0,31 an
-1
). Le poids asymptotique a été estimé à partir de la longueur asymptotique à 406,7 g. Les paramètres de mortalité calculés sur la
base des paramètres de croissance obtenus pour la population de C. granulata dans cette partie du bassin algérien sont (M = 0,41 an
-1
,
Z = 1,94 an
-1
, F = 1,53 an
-1
).
Mots Clés: Paramètres de croissance , Mortalité , Brachyoures , C. granulata , Bassin algérien.
INTRODUCTION
The shamefaced crab Calappa granulata (Linnaeus, 1758)
is a sublittoral species known from the Mediterranean Sea
and adjacent Atlantic Ocean from Portugal to Mauritania,
including the Azores, Madeira, the Canary Islands, and the
Cape Verde Islands (Manning & Holthuis 1981, Števcic
1990). It was recorded in Algeria by several authors (Santucci
1930, Délye 1957, Grimes 2004). This benthic species
lives buried in sand or silt sediments (García Raso 1984).
It is the main species of brachyuran crustaceans, found in
Algerian fisheries related to the eastern area of the coast.
No study of growth or mortality parameters of C. granulata
belonging to the Mediterranean Sea’s stock was carried out
before. The purpose behind this study is to evaluate growth
and mortality parameters of this crab species in this specific
area. After prospecting fisheries along the Algerian coast,
it was concluded that Calappa granulata is landed in large
quantities in the east compared to the center and the west, and
for that, the study was restricted to this area. The most recent
descriptive study of C. granulata was conducted by P. Noël
(2013). The description was achieved also by several authors
including Fischer et al. (1987).
MATERIAL AND METHODS
Sampling and area Study
The related observations were made on collected samples from
the eastern Algerian coast, between 2016 and 2018 (Fig. 1). A
total of 233 specimens of Calappa granulata were examined.
Specimens were sexed; also measurements of cephalothoracic
length (CL) were recorded to the nearest millimeters (Fig. 2),
as well as total weight (TW) to the nearest 0.01g.
Figure 1. Map of the Algerian coast indicating western (A), central
(B) and eastern (C) areas.
e-ISSN : 1114-6834
Bulletin de l’Institut Scientifique, Rabat, Section Science de la vie , 2019, n° 41, 1-5
Growth and assessment parameters of Calappa granulata (Crustacea ; Decapoda ;
Brachyura) in the eastern Algerian coast (Southern Mediterranean Sea)
Paramètres de croissance et d’exploitation de Calappa granulata (Crustacés ;
Décapodes ; Brachyoures) dans le bassin algérien oriental (Méditerranée Sud)