Summary River rehabilitation schemes are now widespread in the UK and elsewhere, but there have been few systematic assessments of their ecological effect, particularly on target organisms such as fish. Fish populations were therefore assessed 13 lowland rivers using point abundance measures depletion electrofishing. Each river was sampled two reaches, respectively containing a small‐scale scheme (artificial riffles or flow deflectors) an unrehabilitated control reach. Detailed...

Abstract The European bitterling Rhodeus sericeus Pallas is a freshwater fish belonging to the Acheilognathinae, subfamily that has an unusual spawning symbiosis with mussels. Female possess long ovipositors they use place their eggs onto gills of mussel through mussels' exhalant siphon. Males fertilize by releasing sperm into inhalant siphon mussel. embryos develop inside for approximately month, eventually leaving as actively swimming larvae. Because discrete site can be readily...

The present study presents the results of a survey wide range water bodies in Bangladesh to identify and describe Danio rerio habitat preferences. Field‐based experiments were conducted determine vertical distribution D. column, together with five other fish species commonly found association rerio. is floodplain rather than riverine species, being most abundant shallow lakes, ponds ditches, typically open locations relatively clear vegetation at margins. It connection rice cultivation more...

Fishes are the most speciose group of vertebrates, with more than 24 000 species. They characterized by great diversity in ecology, morphology, life history, behaviour and physiology. Here, phylogenetic patterns orders which polyploidy has been recorded considered, special reference to species richness hybridization: these include such phylogenetically diverse taxa as Lepidosireniformes (lungfish) Perciformes (perch). Examples, predominantly drawn from Cyprinidae Salmonidae, used illustrate...

Mating success tends to be skewed toward dominant males, though female mate preferences may not always correlate with male dominance. In this study, we investigated the mating of zebrafish, Danio rerio, in absence male‐male competition. We paired females sequentially males known dominance rank, using a nested, repeated measures design, egg production as measure preference. predicted that would spawn more frequently and produce larger clutches when higher rank. found significant differences...

Summary Many lowland rivers in Western Europe have been substantially modified to aid land drainage and support the intensification of agriculture. Although there many attempts at rehabilitation, few systematically evaluated on ecological criteria. Macroinvertebrates were assessed 13 UK containing instream rehabilitation structures, seven with artificial riffles (intended mimic natural gravel riffles) six flow deflectors increase flow, depth substrate heterogeneity within channel). In each...

The diet of zebrafish Danio rerio in Bangladesh consisted primarily zooplankton and insects. Zebrafish was an annual species, with the main period reproduction commencing just before onset monsoon season. Growth rates varied age season, most rapid growth early life during months.

Abstract Receiver biases towards specific sensory signals have been demonstrated in insects, birds and fish, both the context of foraging mate choice. In some cases, important sexual selection appear to evolved by exploiting a pre‐existing bias system. For instance, female preferences for male nuptial colouration may arisen from on practices. Using zebrafish ( Danio rerio ), species which red is not factor choice, we tested colour red. We further investigated plasticity raising groups fish...

Abstract The central assumption of evolutionary theory is that natural selection drives the adaptation populations to local environmental conditions, resulting in evolution adaptive phenotypes. three‐spined stickleback ( G asterosteus aculeatus ) displays remarkable phenotypic variation, offering an unusually tractable model for understanding ecological mechanisms underpinning change. Using on N orth U ist, S cotland we investigated role predation pressure and calcium limitation morphology...

Increasing evidence indicates that tissue transglutaminase (tTG) plays a role in the assembly and remodeling of extracellular matrices promotes cell adhesion. Using an inducible system we have previously shown tTG associates with matrix deposited by stably transfected 3T3 fibroblasts overexpressing enzyme. We now show confocal microscopy colocalizes pericellular fibronectin these cells, immunogold electron two proteins are found clusters at surface. Expression vectors encoding full-length or...

Receiver-bias models of signal evolution predict that male sexually selected traits evolve through prior selection for other functions. Female three-spined sticklebacks (Gasterosteus aculeatus) in many populations show a mating preference males with red throat and jaw. It has been proposed this evolved because the choice coloration confers direct indirect benefits to females accordance Fisher-Zahavi model sexual selection. We present evidence is an effect receiver bias perceptual or...

Using a cytochemical approach, we examined the role of tissue transglutaminase (tTgase, Type II) in incorporation latent TGF-β binding protein-1 (LTBP-1) extracellular matrix Swiss 3T3 fibroblasts which tTgase expression can be modulated through tetracycline-controlled promoter. Increased led to an increased rate LTBP-1 deposition matrix, was accompanied by pool deoxycholate-insoluble fibronectin. Matrix could also reduced competitive amine substrate putrescine. Immunolocalization at...

Abstract The reproductive success of alternative mating behaviours may vary within and among populations in relation to environmental factors demographic parameters. We used behavioural genetic data investigate how male density affects territoriality sneaking the European bitterling ( Rhodeus sericeus , Cyprinidae), a freshwater fish that spawns on gills living mussels. Keeping number spawning sites constant, we manipulated densities laboratory mesocosm experiments. showed sneaked...