The macrodasyid gastrotrich Turbanella mustela was studied by light microscopy and analyzed for postembryonic growth and variation. Growth was characterized by a positive relationship between the length of the body and the lengths of the pharynx and intestine, widths of the head and body, and diameter of the buccal capsule. Evidence of early growth in many of these structures is indicated by st...

The aim of this study was to analyze the morphological variation of brown trout (Salmo trutta) in the Duero basin, an Atlantic river basin in the Iberian Peninsula, where a spatial segregation of two divergent lineages was previously reported, based on isozyme, microsatellite and mtDNA data. In these studies, two divergent pure regions (Pisuerga and Lower-course) and several hybrid populations ...

Two specimens of Argyropelecus gigas and Conocara fiolenti were collected from off the city Salalah on Arabian Sea coasts Oman. The represent first confirmed record species northwestern quadrat Indian Ocean. Meristic morphometric characters match those described for these species.

Yellowfin tuna, Thunnus albacares (Bonnaterre, 1788) and bigeye tuna, Thunnus obesus (Lowe, 1839) are two of the most economically important tuna species in the world. However, identification of their juveniles, especially at sizes less than 40 cm, is very difficult, often leading to misidentification and miscalculation of their catch estimates. Here, we applied the mitochondrial DNA control re...

Gobiocypris rarus Ye et Fu ( 1983 ) is an endemic cyprinid fish in China, and is considered to be an endangered species. From a conservation perspective, its population structure is interesting. In the present study, morphological variation, including morphometric and meristic traits, was assessed among wild samples collected in the upper Yangtze River basin. There were no significant meristic ...

From 2009 to 2011 eleven specimens belonging to four bathygadid species of the family Bathygadidae were captured in two different locations in the northern waters of Spain. The morphometric measurements and meristic characters of these specimens are given. The specimens were identified as belonging to the genera Gadomus Regan, 1903, and Bathygadus Günther, 1878, including the following species:...