Etmopterus spinax and Etmopterus pusillus are captured in large quantities in some deep-water ¢sheries along the Portuguese coast and are always discarded. Specimens were collected from February 2003 to May 2004 from deep-water ¢sheries and classi¢ed as mature or immature. Maturity ogives were ¢tted and size at ¢rst maturity estimated for each sex of each species. Both species are late maturing...

Female mating decisions that are based on condition-dependent traits, such as male nutritional state, may be associated with a female’s own condition. In the swordtail fish, Xiphophorus birchmanni, females prefer the chemical cues of well-fed males to cues of food-deprived males. Here we show that this preference is significantly stronger in females when they were experimentally food deprived t...

The distribution of the ribbon leech, NepMlopsis obscwra, was examined in the Central Lowland and Missouri Coteau regions of North Dakota. The leech was found in 12 of3S ponds sampled during a two-year period. Leeches were trapped with throated metal cans and burlap sacks baited with frozen fish parts. Leech ocamence was positively correlated with maximum depth, mean conductivity, and percent l...

The aim of the experiment was to evaluate mercury content in the hair of people in Lubartów and surrounding areas (Lublin region, Poland) depending on their place of residence, lifestyle and diet. mean mercury content in the hair of tested general population from Lubartów and surroundings, which amounted to 0.10±0.07 μg g-1, was similar to the results achieved by other authors for populations f...

The genetic polymorphism and phenotypic variation are key in ecology evolution. morphological variability of the contour fish otoliths has been extensively used for delimitation stocks. These studies conventionally based on average phenotype using elliptic Fourier analysis lineal discriminant as classifier. Considering new analytical options, such wavelet transform non-parametric algorithms, we...

The recruitment of marine fish populations is a central concern of fisheries scientists. Multiple research pathways have been explored, with emphasis of the causes of mortality affecting principally the early developmental stages of fish life. The small data set presented focuses on a feature often inadequately considered, i.e. the nutritional condition of the breeding parent fishes estimated f...

White sharks (Carcharodon carcharias) have been known in Hawaii (∼158W, 22N) since the time of ancient Hawaiians. We compiled sightings and records from 1926 to the present (4 females, 2 males, and 8 unknown sex; 3.3–4.5m total length) and compared them with satellite tracking records (7 females, 9 males, and 6 unknown; 3.7–5.3m total length). White sharks have been sighted in Hawaii throughout...

We apply an advection–diffusion reaction model to data from three different tuna tagging experiments in the western and central Pacific Ocean (WCPO) to reexamine the question of to what extent the population dynamics and spatial characteristics of tropical tunas require international cooperation for effective management. The median lifetime displacement of skipjack ranges from 420 to 470 nautic...

Context. The metal-rich bulge globular cluster NGC 6441 shows a well developed blue horizontal branch (Rich et al.), together with a strong slope upward from the red clump to the blue of the RR Lyrae region. Both features, the former corresponding to the well-known second parameter problem, are not explained by conventional evolutionary models. Aims. Helium self-enrichment is proposed as a poss...

The developmental pathways of the offspring of three groups of trout, Salmo trutta L., with known life histories were compared: one group from a freshwater resident population and two groups from an anadromous population (fish that have smoltified and fish that have not). The fish were hybridized within a group, and 27 families were obtained and reared mixed in two tanks. Tracking fish specimen...