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Egyptian Journal of Aquatic Biology and Fisheries
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Abd Ellah, S. (2025). First Record of the Invasive Species Indothais malayensis (Gastropoda) and New Record of Isognomon bicolor (Bivalvia) in the Mediterranean Sea. Egyptian Journal of Aquatic Biology and Fisheries, 29(4), 3317-3329. doi: 10.21608/ejabf.2025.450212
Shahenaz Abd Ellah. "First Record of the Invasive Species Indothais malayensis (Gastropoda) and New Record of Isognomon bicolor (Bivalvia) in the Mediterranean Sea". Egyptian Journal of Aquatic Biology and Fisheries, 29, 4, 2025, 3317-3329. doi: 10.21608/ejabf.2025.450212
Abd Ellah, S. (2025). 'First Record of the Invasive Species Indothais malayensis (Gastropoda) and New Record of Isognomon bicolor (Bivalvia) in the Mediterranean Sea', Egyptian Journal of Aquatic Biology and Fisheries, 29(4), pp. 3317-3329. doi: 10.21608/ejabf.2025.450212
Abd Ellah, S. First Record of the Invasive Species Indothais malayensis (Gastropoda) and New Record of Isognomon bicolor (Bivalvia) in the Mediterranean Sea. Egyptian Journal of Aquatic Biology and Fisheries, 2025; 29(4): 3317-3329. doi: 10.21608/ejabf.2025.450212

First Record of the Invasive Species Indothais malayensis (Gastropoda) and New Record of Isognomon bicolor (Bivalvia) in the Mediterranean Sea

Article 236, Volume 29, Issue 4, July and August 2025, Page 3317-3329  XML PDF (538.25 K)
DOI: 10.21608/ejabf.2025.450212
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Author
Shahenaz Abd Ellah
Abstract
The present study reports the occurrence of two alien molluscan species in the Egyptian Mediterranean Sea. It documents the first record of the gastropod Indothais malayensis in both the Mediterranean Sea and Egypt, as well as a new record of the bivalve Isognomon bicolor in the Mediterranean Sea and its first occurrence in Egypt. In 2024, specimens of I. malayensis and I. bicolor were manually collected during a surveillance study of rocky shore molluscs in Abu Qir Bay, Alexandria, Egypt. Specimens were found in sediments associated with rocky shores and intertidal zones, at depths ranging from 0.4 to 0.6 meters. During sampling in October 2023, January 2024, April 2024, and July 2024, approximately 312, 298, 79, and 27 individuals per square meter of I. malayensis were collected, respectively. In the same periods, 45, 9, 15, and 3 individuals per square meter of I. bicolor were recorded. All specimens were identified to the species level based on morphological characteristics of the shell.
Keywords
Non-Indigenous species; Invasive; Isognomon bicolor; Indothais malayensis
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