The systematic status and the evolutionary biology of chub mackerel (Scomber japonicus) in the South West Atlantic Ocean is confusing with an unknown degree of genetic differentiation and reproductive isolation between units. Simultaneous genetic and morphologic analyses were made on 227 fish collected from two areas of the South West Atlantic Ocean and one from the Mediterranean Sea. The genet...

Cobia, Rachycentron canadum, is the only species in family of Rachycentridae. Cobia typically characterized as having 26–33 dorsal-fin rays. However, an investigation specimens collected from Western Visayas waters revealed a wider variation ray count than previously reported, with some 35–36 Suspecting possible cryptic species, we compared mitochondrial cytochrome oxidase subunit 1 (COI) seque...

Several studies of the ecology of mesopelagic fishes off Hawaii published in the 1970s and 1980s reported the existence of as many as two undescribed species in the Pacific Ocean. Diagnosed primarily on the basis of postorbital and accessory orbital photophore size and size at maturity, three new species are described: P. liemi, new species, and P. tantillux, new species, both endemic to tropic...

Two colour types were revealed in a zoarcid fish of the subgenus Furcimanus, genus Lycodes, in the Sea of Japan. A comparison of morphometric, meristic and genetic characters in dark coloured and light coloured individuals suggests that the two colour morphs represent a single species, determined to be Lycodes nakamurae (Tanaka, 1914). Variability in colouration within L. nakamurae and a lack o...

The population structure of the bluefish, Pomatomus saltatrix (Linnaeus, 1766), in Turkish waters is scarcely described literature. To identify any distinct units and reaffirm findings a previous study, four areas were selected: Aegean Sea, western Black eastern Sea Marmara. In this truss network morphometrics, meristics, otolith shape analyses successfully applied for different identification ...

Two specimens of the butterfly blenny, Blennius ocellaris, were caught off coast Ordu (Black Sea, Turkey) in April 2021 by trammel net. The aim this paper is to further document occurrence and distribution blenny for Black Sea Turkish marine ichthyofauna provide first morphometric, reproduction, genetic data on species fauna species. Some morphometric meristic characters measured presented as p...

The genus Paraneetroplus (Teleostei: Cichlidae) currently consists of 11 species that naturally occur from southern Mexico south to Panama. Paraneetroplus melanurus (Günther 1862) is found in the Lago de Petén system of Guatemala, and P. synspilus (Hubbs 1935) in the Río Grijalva-Usumacinta system, and other systems in Mexico, Belize, and Guatemala. Reported morphological differences between th...