Abstract The spawning grounds of the Atlantic bluefin tuna ( Thunnus thynnus ) are traditionally considered to be Gulf Mexico (Gulf Mexico) and Mediterranean Sea (Mediterranean Sea). However, for western Atlantic, unequivocal evidence outside has been shown. In this study we present first records genetically confirmed larvae in southern Bay Biscay (eastern Atlantic). These findings provide acti...

Abstract Salmonine fishes are generally thought not to exhibit male parental care, although brief post-spawning mate-guarding by males is known for a number of species, often populations where eggs subjected intense predation (egg cannibalism). Here, detailed in situ data on the spawning behaviour brook charr, Salvelinus fontinalis , from naturally reproducing lake population used test whether ...

Norwegian spring-spawning herring are a critical economic resource for multiple nations in the North Atlantic and keystone species of Nordic Seas ecosystem. Given wide areas that occupy, it is difficult to accurately measure population size spatial distribution. Ocean Acoustic Waveguide Remote Sensing (OAWRS) was used instantaneously areal density over more than one thousand square kilometers s...

Abstract Seismic airgun surveys may disturb and displace fish at large ranges. If such displacement causes to abandon spawning grounds, reproductive success could be impacted. To investigate whether sound cod (Gadus morhua L.) leave their acoustic telemetry arrays were deployed on two grounds: a test reference site. From 2019 2021, 136 mature from the site 45 tagged with transmitters. Intermitt...

From 1997 to 2004, we used radio telemetry to investigate movement and distribution patterns of 206 adult fluvial bull trout (mean, 449 mm FL) from watersheds representing a wide range of habitat conditions in northeastern Oregon and southwestern Washington, a region for which there was little previous information about this species. Migrations between spawning and wintering locations were long...

A quasi-cyclicity associated with variability of environmental conditions is detected for the regression residuals stock-recruitment model chum salmon Oncorhynchus keta in Okhotsk district, described by Ricker’s equation. The main factors influenced on progeny abundance were number spawners and amount precipitation spawning grounds area certain months. mathematical has been developed that simul...