In many seabird studies, single annual proxies of prey abundance have been used to explain variability in breeding performance, but much more important is probably the timing of prey availability relative to the breeding season when energy demand is at a maximum. Until now, intraseasonal variation in prey availability has been difficult to quantify in seabirds. Using a state-of-the-art ocean dr...

Annual data on the 1976–2019 year-classes of pink salmon from Iturup Island are presented, as their number spawning grounds, abundance wild and hatchery juveniles migrating downstream, returns adult fish after marine period life. On average, 1.48 . 106 spawners entered annually rivers in these years 237 fry rolled down (the downstream migration index was 165 per conventional producer), plus 133...

European squid, Loligo vulgaris and veined forbesii have nearly coinciding distributions in the northeast Atlantic, a similar reproductive seasonality, largely overlapping depth ranges of spawning grounds. There are no unambiguous criteria to distinguish between egg masses both species. This pioneering study was focused on Celtic Sea western part English Channel combined research survey data ob...

Identifying and protecting essential fish habitats like spawning grounds requires an accurate knowledge of spatio-temporal distribution. Commercial declarations coupled with Vessel Monitoring System provide fine scale information on the full year to map distribution identify habitats. We developed integrated framework infer spatial a monthly time step by combining scientific commercial data whi...

Abstract Increased knowledge on connectivity is crucial to our understanding of the population dynamics, genetic structure, and biogeography many coastal species. In marine populations, main factor for structuring thought be degree isolation confinement, limiting exchange between populations. However, offshore populations use areas as nursery grounds, but venture back natal spawning grounds adu...

The Ayu Plecoglossus altivelis is an amphidromous fish that not only the most important commercial fishery species in Japanese rivers but also has a high economic value recreational fishing. However, degradation of its spawning grounds caused decrease abundance. In this study, we used environmental DNA (eDNA) to monitor Takatsu River Japan (1) identify season three known grounds, (2) clarify ch...

—It is difficult for agencies to evaluate the impacts of the many planned dams on São Francisco River, Brazil, migratory fishes because fish migrations are poorly known. We conducted a study on zulega Prochilodus argenteus, an important commercial and recreational fish in the São Francisco River, to identify migrations and spawning areas and to determine linear home range. During two spawning s...

The present study uses stable isotopes of nitrogen and carbon (δNandδC) as trophic indicators for Atlantic bluefin tuna larvae (BFT) (6–10mm standard length) in the highly contrasting environmental conditions of the Gulf of Mexico (GOM) and the Balearic Sea (MED). These regions are differentiated by their temperature regime and relative productivity, with the GOM being significantly warmer and ...