Research for Fish Motion Model

The fish motion essentially reflects the state of water quality, so it is necessary to study the methods of obtaining the real-time dynamic motion characters of fish body in the field of biological monitoring of water quality. From the point of view of the video, to extract the fish skeleton and to establish the motion model. Based on analysis of the motion model, it is easy to acquire some parameters, i. e. , fish swimming velocity and corner, tail dimensionality and so on. The experimental results show that our model can describe fish swimming, which lie a theory foundation for the fish to participate in the environment pollution research.

Irish Banshee and Russian Rusalka: The Comb Motif — Its Meaning and Genesis

Banshee represents a specific figure of Irish folklore: it is a female spirit whose cry foretells death of a family relative or a neighbour. One may take it for granted that Banshee (Mod. Irish Bean Sí) represents a specific Irish folklore character and has no parallels in other narrative traditions. But if we look at the image of Banshee on the whole, we will find some features that could associate her with Russian Rusalkas as well as with other female characters of the European folklore tradition. The motif of combing the hair is encountered in beliefs and memorates concerning Banshee. The Slavonic Rusalkas also enjoy spending time combing their long hair with a comb (in every instance, it is made of a different kind of material). It can be golden, silver, wooden, made of horn, of fish skeleton and the fabulates point out its magic power. The motif of combing the hair by a supernatural female creature must be divided into two separate concepts. The first is the long hair of a female supernatural creature connected with danger. The second is the taboo of taking the magic comb as a dangerous object.

A new paraclupeid fish (Clupeomorpha, Ellimmichthyiformes) from a muddy marine pro-delta environment: middle Cenomanian Dunvegan Formation, Alberta, Canada

A black marine mudstone in allomember A of the middle Cenomanian Dunvegan Formation, Alberta, yielded a well-preserved, deep-bodied fish skeleton attributable to a new genus and species, Tycheroichthys dunveganensis, in the Paraclupeidae (Clupeomorpha, Ellimmichthyiformes). This new taxon appears most closely related to members of the subfamily Paraclupeinae, which includes largely freshwater and estuarine or marginal marine species known from South and Central America and China. The Dunvegan Formation represents a large delta complex deposited in the Western Interior Seaway at about 65°N, where mean sea water temperature may have been about 10 °C. The specimen was found about 60 km from the contemporaneous shoreline, and, in life, apparently inhabited a shallow, muddy pro-delta environment characterized by high turbidity and variable salinity. The fish may have died when it was engulfed by brackish floodwater that also introduced suspended mud that rapidly buried the body, preventing physical disarticulation of the skeleton. River outflow probably produced a salinity- and density-stratified water column that limited oxygen transfer to the sea floor, leading to dysaerobic bottom water and an absence of scavengers. High terrestrial phytodetrital content of the sediment also favoured anaerobic conditions that limited bacterial decay.