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INTRODUCTIONContagious caprine pleuropneumonia (CCPP) is a serious disease of goats in some countries of Asia and Africa. Although the disease has been known since 1873 (Longley, 195 1 ), its etiology remained confused until Longley ( 1940,195 1 ) was able to see, in dark-ground preparations of pleural exudate from diseased goats, organisms similar to M . mycoides, and was also able to isolate the organism in culture.Antigenic differences between various mycoplasma strains from diverse sources was demonstrated by Kleineberger (1938, 1940). Recently, however, it was reported that M . mycoides and M . Capri shared common antigens (Edward, 1953;Villemot and Provost, 1959;Lemcke, 1965). Furthermore, a CCPP strain isolated by Pillai in the Sudan was found to be identical with M . mycoides (Hudson and Cottew;Lemcke, 1964).Apart from the taxonomic significance of these findings, they also have a practical importance in countries where both CCPP and contagious bovine pleuropneumonia exist.This work was carried out to study the cultural, serologic and pathogenic properties of mycoplasma isolated from clinical CCPP in the Sudan, and to compare them with other strains isolated from similar conditions in Nigeria and Turkey. One strain each of M . mycoides and M . agalactiae was also included in the cultural and serologic tests for comparison. MATERIALS AND METHODS OrganismsStrains from Goats. These were 11 strains isolated from either lung lesions or pleural exudate from goats with clinical CCPP in different countries. The designation of each strain, its country of origin and the worker or workers who isolated it are given in TABLE 1. The five strains isolated by Pillai were all found to be the same, and will therefore be referred to as Pillai strains. The two strains isolated by the author and the one isolated by Dawi were also found to be identical, and shall be referred to as GPS (Goat Pneumonia Sudan).M . mycoides. A fully virulent strain (121) isolated from a case of contagious bovine pleuropneumonia in the Sudan.M . agalactiae. This was obtained from the collection at Burroughs Wellcome. Cultural MethodsPPLO Broth and Agar (Difco) and modified Dafaalla's medium (Nasri, unpublished) were used to grow the organisms. In fermentation tests, bacto phenol red agar (Difco) was used after the addition of 1 % of the required carbohydrate.PPLO serum fraction (Difco) was used to supplement PPLO media, while 30% inactivated horse serum was used in others. When antigens were required for This work was supported by a grant from the University of Khartoum, Sudan.

Summary This study investigates length–length and length–weight relationships of three Sillago species [Sillago arabica McKay & McCarthy (Memoirs of the Queensland Museum, 27, 1989, 551), Sillago attenuata McKay, 1985 and Sillago sihama (Forsskål, 1775)] captured in the Persian Gulf, Iran. A collection of 220 specimens was captured from August 2015 to January 2016 by cast net (mesh size: 10 mm) and beach seine (mesh size: 15 mm). The relationships of total length (TL) and standard length (SL) and the relationships between total length and body weight are given. This study presents the first reference on LWRs for two of the species (S. arabica and S. attenuata) in their range of distribution.

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