STUDIES ON THE BIOLOGY OF MANTIS SHRIMPS IN THE SUEZ CANAL.
Wafaa Said Sallam;
Abstract
The mantis shrimp Erugosquilla massavensis (Stomatopoda: Crustacea) has
long been recognized as one of the most successful Lessepsian migrants from the Red Sea to the Mediterranean via the Suez Canal. It has also been reported to establish itself in several parts of the canal building up large populations. A seasonal survey during the period between May 1996 and April 1997 was carried out in order to describe the present occurrence and distribution of stomatopods along the Suez Canal
and its northern entrance on the Mediterranean at Port Said. Two species were
• recognized (Erugosquilla massavensis and Squilla mantis) and their distribution was
discussed with respect to the phenomenon of Lessepsian migration. The nature of the fishery ofstomatopods was described as a part of the overall fishery of the commercial crustaceans in the area. Information was given on the locations of the fishing grounds, landings, fishing gears, and marketing of the shrimps in the Suez Canal (at Defresoir) and the northern entrance (at Port Said).
The population biology and ecology of Erugosquilla massavensis in Defresoir
• and Port Said was studied based on monthly samples obtained during November 1995- November 1997. According to the morphological features and histological
investigation of the gonads of this species, four stages of ovarian maturation were observed and recognized. The ratio of females to males was significantly different in Defresoir (1:1.15) and insignificantly different in Port Said (1:1). Depending on the proportions of mature females in each maturity stage, the spawning season was found
to take place during January to July with a well-defined resting phase extending from
• August to December. The size at the onset of sexual maturity was observed within the
20-21 mm carapace length class in the two sites. According to the size when 50% of females are mature, Port Said females were observed to reach maturation earlier than those ofDefresoir (25.7 mm, 28.7 mm carapace length respectively).
A synchronous development and activity of the cement glands with the ovarian maturation of E. massavensis females was observed. Fecundity was estimated as the total number of ripe ova (i.e. in their last stage of development) in the ovaries. Port Said females tended to be slightly heavier and more fecund for a given length than
long been recognized as one of the most successful Lessepsian migrants from the Red Sea to the Mediterranean via the Suez Canal. It has also been reported to establish itself in several parts of the canal building up large populations. A seasonal survey during the period between May 1996 and April 1997 was carried out in order to describe the present occurrence and distribution of stomatopods along the Suez Canal
and its northern entrance on the Mediterranean at Port Said. Two species were
• recognized (Erugosquilla massavensis and Squilla mantis) and their distribution was
discussed with respect to the phenomenon of Lessepsian migration. The nature of the fishery ofstomatopods was described as a part of the overall fishery of the commercial crustaceans in the area. Information was given on the locations of the fishing grounds, landings, fishing gears, and marketing of the shrimps in the Suez Canal (at Defresoir) and the northern entrance (at Port Said).
The population biology and ecology of Erugosquilla massavensis in Defresoir
• and Port Said was studied based on monthly samples obtained during November 1995- November 1997. According to the morphological features and histological
investigation of the gonads of this species, four stages of ovarian maturation were observed and recognized. The ratio of females to males was significantly different in Defresoir (1:1.15) and insignificantly different in Port Said (1:1). Depending on the proportions of mature females in each maturity stage, the spawning season was found
to take place during January to July with a well-defined resting phase extending from
• August to December. The size at the onset of sexual maturity was observed within the
20-21 mm carapace length class in the two sites. According to the size when 50% of females are mature, Port Said females were observed to reach maturation earlier than those ofDefresoir (25.7 mm, 28.7 mm carapace length respectively).
A synchronous development and activity of the cement glands with the ovarian maturation of E. massavensis females was observed. Fecundity was estimated as the total number of ripe ova (i.e. in their last stage of development) in the ovaries. Port Said females tended to be slightly heavier and more fecund for a given length than
Other data
| Title | STUDIES ON THE BIOLOGY OF MANTIS SHRIMPS IN THE SUEZ CANAL. | Other Titles | دراسات على بيولوجية جمبرى فرس النبى فى قناة السويس | Authors | Wafaa Said Sallam | Issue Date | 2000 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B15655.pdf | 1.03 MB | Adobe PDF | View/Open |
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