In East African Lake Victoria >200 endemic species of haplochromine fishes have been described on the basis of morphological and behavioral differences. Yet molecular analysis has failed to reveal any species-specific differences among these fishes in either mitochondrial or nuclear genes. Although the genes could be shown to vary, the variations represent trans-species polymorphisms not yet as...

A network of nine Fish Replenishment Areas (FRA) reserves was demarcated in West Hawai’i in 2000 in response to declines of reef fishes taken by aquarium collectors. In 1999, we established 23 study sites in FRAs, areas open to collectors and reference areas (existing protected areas) to collect data both prior to and after the closure of the reserve network in 2000. To date we have conducted 3...

Channel catfish (Ictalurus puncatus) and freshwater drum (Aplodinotus grunniens) are two commercially recreationally important species in large rivers of the Midwestern United States. Understanding their population demographics is essential to managing sustainable populations. In this study, we determined compared size structure, individual growth, mortality estimates channel among Illinois Riv...

This study was carried out to investigate the genetic diversity and population structure of 90 specimens of Oxynoemacheilus argyrogramma collected from Sepidbarg, Gamasiab and Ghaleji rivers, in the west of Iran. Analyses using three microsatellite loci indicated that the average number of alleles in the population was 12, which was well above the reported values for freshwater fishes. The expe...

background: the aim of this study was to detect the occurrence of parasites in fish in armand river, chaharmahal va bakhtyari province regarding the importance of native fish population in the river. methods: the occurrence of parasites was investigated in 6 native fish ( capoeta capoeta, c. damas­cina, c. aculeta, barbus barbulus, b. grypus and glyptothorax silviae ) collected from the current...

Growth in body size is a key life-history trait that has coevolved and interlinked with maturation, maximum age, mortality, generation time, the intrinsic rate of population growth. parameters are therefore required inputs majority assessment models used conservation or fisheries management. However, because difficulties involved proper aging individuals, growth unknown for vast species. Here, ...

Despite the importance of recruitment for population dynamics and assessing stock status, limited information exists on relative influence various ecosystem demographic factors marine fishes. We develop a statistical framework to identify influencing fishes facilitate improved predictions recruitment. demonstrate approach by examining southern Gulf St. Lawrence spring- fall-spawning Atlantic he...

Skeletal deformities seriously relegate the biological performance of fish. The frequency of occurrence of different types of meristic variations and skeletal deformities were shown in population of Mahseer fish, Tor putitora, in two main reservoirs; Korang stream, Islamabad and Dhobi Ghat stream, Hassan Abdal. Total of ninety-five fishes were caught randomly, forty-five from the unpolluted Kor...

A microbial technique of biocontrol using the interaction of microorganisms to repress the growth of deleterious bacteria and viruses was deveioped. The bacterial strain used in this work also improved the growth of fishes and crustaceans. To control the bacterial population, protozoa was found having a significant role in the aquaculture biotope, The concept of biocontrol in aquaculture is als...

Predicting the impacts of non-native species remains a challenge. As populations of a species are genetically and phenotypically variable, the impact of non-native species on local taxa could crucially depend on population-specific traits and adaptations of both native and non-native species. Bitterling fishes are brood parasites of unionid mussels and unionid mussels produce larvae that parasi...