Organisms into which heterologous DNA (transgene) has been artificially introduced and integrated in their genomes are called transgenics. Since the mid 1980s, many species of transgenic fish have been produced by introducing desired foreign DNA into unfertilized or newly fertilized eggs by microinjection or electro-poration. More recently, transgenic finfish, shellfish, and crustaceans have al...

Discarding by fisheries is perceived as contrary to responsible harvesting. Legislation seeking to end the practice is being introduced in many jurisdictions. However, discarded fish are food for a range of scavenging species; so, ending discarding may have ecological consequences. Here we investigate the sensitivity of ecological effects to discarding policies using an ecosystem model of the N...

The paper deals with recognition of artificial landmarks using fish-eye lens. The proposed recognition model is based on algebraic affine moment invariants (AMIs). Landmarks are used for the navigation of an autonomous robot, equipped with a fisheye lens camera. The recognition ability of the AMIs regarding the deformation introduced by the fish-eye lens image acquisition is investigated. The r...

The Asian fish tapeworm Bothriocephalus acheilognathi (Cestoda: Bothriocephalidea) is an introduced fish parasite in the southwestern United States and is often considered a serious threat to native desert fishes. Determining the geographic distribution of nonnative fish parasites is important for recovery efforts of native fishes. We examined 1,140 individuals belonging to nine fish species fr...

Abstract Small fish species such as minnows ( Phoxinus sp.) are introduced into mountain lakes by anglers that use them live bait for fishing salmonids were previously in these naturally fishless habitats. Introduced severely impact native biota but nevertheless released believing to provide forage game fish, i.e., salmonids. However, our results indicate negatively interact with reducing their...

—Knowledge of individual growth and mortality rates of an introduced fish population is required to determine the success and degree of establishment as well as to predict the fish’s impact on native fauna. The age and growth of flathead catfish Pylodictis olivaris have been studied extensively in the species’ native and introduced ranges, and estimates have varied widely. We quantified individ...

parasitic infection of pampus argenteus was examined from northwest of qeshm island. a total of 62 specimens were caught in summer 2008 and winter 2009 by bottom trawl and the specimens were selected randomly in different length classes and immediately deep frozen. all samples were transferred to laboratory, after measuring fish weight and length, parasitological survey implemented by stereo an...

the environmental and ecological issues in the flow-reduced river reach are very serious and arereceiving increasingly attention. in this study, we investigate the temporal and spatial changes in δ13c and δ15n of periphyton and isotopic relationship between periphyton and the endangered fish (ayu, plecoglossusaltivelis) in a flow-reduced river reach in japan. much of the spatial and temporal va...