The taxonomy of the intertidal pilumnid crabEurycarcinusA. Milne-Edwards, 1867 is reviewed in the present work. Characters that defineEurycarcinusand distinguish it from the allied generaHeteropanopeStimpson, 1858,PilumnopeusA. Milne-Edwards, 1867, andBenthopanopeDavie, 1989 are discussed.Eurycarcinuscan be distinguished from these genera by the smooth features of the carapace, shape and form of the male pleon, and structure of the male thoracic sternum, notably the shapes of sternites 1-4 and whether sternite 8 is exposed when the pleon is closed. Of the four species ofEurycarcinus,E. bengalensisDeb, 1999, is here assigned toHeteropanope. Furthermore,Eurycarcinusspecies are known for certain only from the western Indian Ocean.

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The present study deals with first record of the alien Lysmatid shrimp Lysmata vittata (Stimpson, 1860) collected in April 2017, from the Egyptian Mediterranean Sea. A concise re-description supplied with illustrations, taxonomical remarks, habitat and distribution of the recorded species are provided.

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In this paper, we present a cost-effective approach to the assessment of the impact of fish cage culture in transitional water bodies characterized by limited exchanges with the sea. The approach, previously applied to marine coastal areas, is based on two steps: 1) the application of a Lagrangian model, driven by purposely collected data concerning the local hydrodynamic, for an "a priori" simulation of the dispersion of uneaten feed and fecal material from a cage; 2) the collection of a set of field data concerning both water column and sediment indicators, sensitive to the release of organic matter from a cage, along a transect: the latter is determined on the basis of the results provided by the dispersion model. The methodology was tested at a seabass/seabream farm located in a coastal lake on the Nile Delta, namely Lake Maryut. Model results indicated that the area impacted by the cage is relatively small, about 5 m from the edge of the cage: this finding was later corroborated by field observations. As far as the water column is concerned, Dissolved Inorganic Nitrogen was found to be higher near the farm. The most sensitive sediment indicators were found to be surface sediment TOC, and benthic macrofauna abundances, which were, respectively, higher and lower in the proximity of the farm. These findings suggest that a cost-effective monitoring programme of the environmental impact of intensive aquaculture could be implemented in Egyptian coastal Lakes, thus providing a science-based support to the implementation of the ecosystem approach to aquaculture in these important ecosystems. keywords fish cage culture; aquaculture impact indicators; Lagrangian models; sediment organic enrichment; macrobenthos; Nile Delta lakes 3

The present paper describes a submarine survey using the acoustic discrimination system QTC VIEW (Series V) as an exploratory tool to adjust final route alignment of a new pipeline. By using acoustic sound survey as an exploratory tool described in this paper to adjust final route alignment of a new pipeline to minimize the environmental impact caused and ultimately to avoid any mitigation measures. The transmission pipeline extended from the shore line of Abu-Qir Bay, on the Mediterranean Sea in Egypt, out to 70 nautical miles at sea (60 m water depth). Four main surface sediment types were defined in the study area, namely fine sand, silty sand, silt and clay. Results of the acoustic classification revealed four acoustic classes. The first acoustic class corresponded to fine sand, absence of shell debris and very poor habitats characteristics. The second acoustic class is predominant in the study area and corresponds to the region occupied by silt. It is also characterized by intermediate diversity of macrobenthic invertebrate community which is mainly characterized by polychaeta. The third acoustic class is characterized by silt to silty clay. It is characterized by a high diversity of macrobenthic invertebrate community which is mainly polychaeta with an intermediate diversity of gastropoda and bivalvia. The final acoustic class is characterized by clay and high occurrence of shell debris of gastropoda, bivalvia and polychaeta.

Beginning in December 2015, an unknown bryozoan with large, deep-orange colonies began to appear in the Eastern Harbour of Alexandria, Egypt. Here we identify the species as belonging to the predominantly Indo-Pacific cheilostome genus Calyptotheca Harmer, 1957 and describe it as a new species, Calyptotheca alexandriensis n. sp. The new species exhibits intensive growth sporadically on different hard substrata, including rocks, submerged concrete walls, ropes, ships’ hulls, and metal pipes supporting marina piers. It is restricted to the Eastern Harbour, particularly in shallow parts, with the densest aggregations on the metal pier supports. The source of this bryozoan is enigmatic but most likely involved introduction by shipping.