To reveal the accumulation profile of tetrodotoxin (TTX) in pufferfish Takifugu rubripes juveniles, we compared the localization of TTX in various tissues among wild juveniles and hatchery-reared juveniles with or without TTX administration using immunohistochemical technique with anti-TTX monoclonal antibody. Immuno-positive reaction was observed in hepatic tissue, basal cell of skin and olfac...

We used parentage analysis based on microsatellite genotypes to measure rates of homing and straying of Chinook salmon (Oncorhynchus tshawytscha) among five major spawning tributaries within the Wenatchee River, Washington. On the basis of analysis of 2248 natural-origin and 11594 hatchery-origin fish, we estimated that the rate of homing to natal tributaries by natural-origin fish ranged from ...

The conditions encountered by Atlantic salmon, Salmo salar L., in aquaculture are markedly different from the natural environment. Typically, farmed salmon experience much higher densities than wild individuals, and may therefore have adapted to living in high densities. Previous studies have demonstrated that farmed salmon typically outgrow wild salmon by large ratios in the hatchery, but thes...

This study is situated within a national research program aimed at elucidating the multiple challenges faced by small coastal communities who are sensitive to the social and environmental events that shape and shift their livelihood. Decisions that affect these communities are often embedded within scientific discourse and neglect the diverse and rich locally situated knowledge that exists with...

Genetic diversity of two wild Kalibaus, Labeo calbasu populations and one hatchery stock was studied using random amplified polymorphic DNA (RAPD) method. The three 10–mer random primers (OPA01, OPB02 and OPC03) yielded a total of 26 reproducible and consistently scorable RAPD bands of which 15 (57.69%) were considered as polymorphic (P95) indicating a high level of genetic variation in all the...

Accumulating data indicate that hatchery fish have lower fitness in natural environments than wild fish. This fitness decline can occur very quickly, sometimes following only one or two generations of captive rearing. In this review, we summarize existing data on the fitness of hatchery fish in the wild, and we investigate the conditions under which rapid fitness declines can occur. The summary...

Allelic variation at 10 microsatellite loci was assayed in potentially wild Oncorhynchus mykiss 32 collected from 11 tributaries and three upper main stem river sites (n=547), and compared to steelhead 33 trout from the hatchery operated in the lower main stem river (n=333). The objective was to investigate 34 microgeographic genetic structure of wild O. mykiss , in the face of large-scale hatc...

The high loss of newly released hatchery-reared European lobster (Homarus gammarus) juveniles for stock enhancement is believed to be the result of maladaptive anti-predator behaviour connected to deprived stimuli in the hatchery environment. Our objective was to learn if an enriched hatchery environment enhances shelter-seeking behaviour and survival. In the "naïve" treatment, the juveniles we...

Captive breeding programs are widely used for the conservation and restoration of threatened and endangered species. Nevertheless, captive-born individuals frequently have reduced fitness when reintroduced into the wild. The mechanism for these fitness declines has remained elusive, but hypotheses include environmental effects of captive rearing, inbreeding among close relatives, relaxed natura...

Ž . Brown trout Salmo trutta L. stocking practices in French Mediterranean rivers often result in artificial secondary contact and introgression between substantially differentiated genomes. Single and joint segregation at five protein and four microsatellite loci were analysed in two back-crosses Ž . between hybrid females resulting from domestic=Mediterranean genitors and hatchery males in or...