Publisher : Biodiversity Journal
Place of publication :
Publication year : 2011
Thematic : Species
Language : English
Note
The aim of this work was to study the annual reproductive cycle of European conger eel (Conger conger,
Linnaeus, 1758) through analysis and description of spermatogenesis. A sample of 168 males was captured
between September 2008 and August 2009 from the Western coast of Algeria, from Béni Saf. Fish length and
weight varied between 26.20-112 cm and 0.45-3.44 kg, respectively.
Condition factors (K), gonadosomatic index (G.S.I.) and hepatosomatic index (H.S.I.) were calculated
monthly. Factor K reached the minimum in August/September (0.10%) corresponding to reproductive period
and a maximum in January (0.18%). Although G.S.I. values revealed to be statistically not significant, there
were two peaks for G.S.I., the first in March, denoting the beginning of spermatogenesis, and the second in
August/September, indicating the reproduction period. H.S.I. reached a peak in December (1.90%), then the
value decreased to a minimum in April.
Histological analysis of testis allowed us to distinguish 5 stages summarized as follows: Stage 1:
Spermatogonia A; Stage 2: Spermatogonia B; Stage 3: Spermatocytes and spermatids; Stage 4: Spermatocytes,
spermatids and spermatozoa (cytodifferentiation of spermatids into spermatozoa); Stage 5: Spermatozoa
(spermiogenesis or cytodifferentiation of spermatids into spermatozoa).
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Keywords : india
Encoded by : Pauline Carmel Joy Eje
