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Captures of the slender sunfish, Ranzania laevis, are reported off the coastline of the cities of Sohar and Seeb, Oman Sea, Sultanate of Oman in February and March 2009. Their association with the environmental factors such as warming process is discussed.
Asymmetry analysis was conducted on four morphometric bilateral characters and one meristic character of Leiognathus equulus (Forsskal) collected from the Sea of Oman at the city of Muscat. The results showed that the level of asymmetry of the characters of preorbital distance and head length is higher than that of the rest of the characters studied. Increasing asymmetry values with fish length were noted in preorbital and postorbital distances and head length. This might be the result of incomplete development. The possible cause of asymmetry in this species is discussed in relation to different pollutants and their presence in the area.
Recent parasitological examinations of the marine perciform fish (tigerteeth croaker) Otolithes ruber (Bloch et Schneider) (Sciaenidae) from off Iran yielded one new and one previously known nematode species: Dichelyne (Dichelyne) spinigerus sp. nov. (Cucullanidae) from the host’s intestine in the Persian Gulf and Philometra otolithi Moravec et Manoharan, 2013 (Philometridae) from the ovary in the Persian Gulf and the Sea of Oman. The new species D. spinigerus is mainly characterized by the tail tip of both sexes terminating in two shaply pointed spikes (one dorsal and one ventral) and bearing a pair of minute lateral cuticular spines at its base, situation of both deirids and the excretory pore well posterior to the level of the posterior end of oesophagus, absence of a precloacal sucker and the presence of one or two intestinal caeca. The male and small mature females of the gonad-infecting species P. otolithi are described for the first time, based on light and scanning electron microscopical studies. The male of P. otolithi is most similar to that of P. johnii Moravec et Ali, 2013, but differs from it by the structure of the cephalic end and the number of caudal papillae; both species also differ from each other by the presence of transverse lamellae in the buccal cavity of gravid and subgravid females of P. otolithi, which are missing in those of P. johnii.
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