This paper developed a biomimetic batoid model to investigate the effect of amplitude on propulsion performance. The contour of model’s pectoral fins was derived from natural batoid fish, and the model was made to simulate the locomotion of biological fish through user defined functions linked to Fluent. Numerical simulations of model were conducted at five different amplitude indices from 0.08...

Background: A variety of abnormalities have been described for sharks, rays and skates across different ecoregions. Morphological and functional anomalies in these species, however, were not yet documented in distributions from the Canary Islands, the spiny butterfly ray Gymnura altavela (Linnaeus, 1758) and from in situ observations. The aim of the present study is to fill these knowledge gaps...

Many sharks and skates are particularly vulnerable to overfishing because of their large size, slow growth, late maturity and low fecundity. In Europe dramatic population declines have taken place in common skate (Dipturus batis L.), one of the largest demersal fish in regional shelf seas, leading to extirpations from substantial parts of its former range. Here we report the discovery of crypti...

Hexanchiformes is regarded as a monophyletic taxon, but the morphological and genetic relationships between the five extant species within the order are still uncertain. In this study, we determined the whole mitochondrial DNA (mtDNA) sequences of seven sharks including representatives of the five Hexanchiformes, one squaliform, and one carcharhiniform and inferred the phylogenetic relationship...

Gorgona island, the major insular area in the Colombian Pacific Ocean, is characterized by a remarkably high biological and ecosystem diversity for this area of the world. Coral reefs are well developed and their fish communities have been described using conventional visual surveys. These methods, however, are known to be biased towards detecting larger and more mobile species, tending to igno...

background: although fish consumption has inversely been associated with several metabolic abnormalities, limited and inconsistent data have reported the relationship between fish consumption and metabolic syndrome. the aim of this study was to identify the association between fish consumption and metabolic syndrome and its components. methods: in a cross-sectional study conducted on 420 irania...

abstract this research was conducted to study the effects of different light colors on growth indices (growth rate and specific growth rate), feed conversion and survival rate in tiger barb (barbus tetazone) fish for 6 weeks. 120 fish with an average weight 75 ±0.02 were respectively divided in four groups of white, natural, green and blue colors (with three replicates for each treatment). fish...