The kisspeptin system plays an essential role in reproductive function in vertebrates, particularly in the onset of puberty. We investigated the kisspeptin system in two Perciform teleosts, the Southern Bluefin Tuna (SBT; Thunnus maccoyii), and the Yellowtail Kingfish (YTK; Seriola lalandi), by characterising their kisspeptin 2 receptor (Kiss2r) genes. In addition to the full length Kiss2r cDNA...

Between September 2006 and April 2007 the authors transported one 0.9 m wingspan Mobula mobular from Olhão (South of Portugal) to Valencia (East of Spain), 12 approximately 1.0 m long Argyrosomus regius to Tarragona (Northeast of Spain) and four approximately 0.4 m long Mola mola to Atlanta (GA, USA). These journeys had a total "water to water" duration of 17, 22 and 33 hr, respectively. The fi...

Intraspecific morphological variation in fish is typically associated with sexual dimorphism, or one of three common environmental gradients: variation in intensity of predation, variation in water velocity, or variation in feeding niche. The preponderance of examples of environment-associated morphological variation within fish species has been documented in freshwater systems. It is not clear...

Consumption is the basis of metabolic and trophic ecology and is used to assess an animal's trophic impact. The contribution of activity to an animal's energy budget is an important parameter when estimating consumption, yet activity is usually measured in captive animals. Developments in telemetry have allowed the energetic costs of activity to be measured for wild animals; however, wild activ...

the aim of this study was to determine the inhibitory effects of feed ingredients on protease activities of argyrosomus regius larvae using in vitro techniques. a. regius larvae fed on a commercial feeding procedure were sampled thirteen times, during the sampling period (from 3 to 32 days after hatching (dah)). the differences observed in protease activities of meagre larvae during the samplin...

Estuaries serve as important nursery habitats for several coastal fishery species. The successful recruitment of larvae and early juveniles into estuaries is paramount population persistence maintenance. Several factors have been proposed stimuli that could elicit a response in estuary-associated fish Larvae may trace land-based cues back to an estuary by following the olfactory concentration g...

The meagre Argyrosomus regius, one of the largest sciaenidae in world, is a valuable resource for fisheries and aquaculture. Despite its socioeconomic relevance, knowledge about population dynamics wild stocks still scarce, conservation risks are associated with overexploitation. Two genetic distinct groups, North Atlantic Ocean eastern Mediterranean Sea, were identified by previous studies. Ho...