Bulletin Francais De La Peche Et De La Pisciculture 

About: Bulletin Francais De La Peche Et De La Pisciculture is an academic journal. The journal publishes majorly in the area(s): Crayfish & Austropotamobius pallipes. It has an ISSN identifier of 0767-2861. Over the lifetime, 703 publications have been published receiving 9871 citations.

Distribution of crayfish in europe and some adjoining countries

Abstract: The distribution of crayfish in Europe is examined using information from a variety of sources mainly for the last two decades. All European countries have at least one indigenous crayfish species (ICS), many with large stocks, and most countries in Western Europe have at least one non-indigenous crayfish species (NICS). Some species termed indigenous in certain countries may have been introduced in relatively recent times. However, the meaning of the term indigenous (native) varies between countries. NICS continue to expand their ranges and present a continued threat to ICS through competition and transmission of diseases, notably crayfish plague. The current high level of interest in crayfish means that many countries are monitoring their crayfish situation and, where necessary, taking steps to renew stocks of threatened indigenous species, some of which are apparently on the verge of extinction. A more regular monitoring programme for European crayfish as a whole is needed if the demise of indigenous species is to be prevented.

Downstream migration: problems and facilities

Abstract: Downstream fish passage technology is much less advanced than it is for upstream fish passage facilities. This is simply due to the fact that efforts to re-establish free movement for migrating fish began with the construction of upstream fish passage facilities, and that downstream migration problems have only been recognised and addressed more recently. It is also because it is much more difficult and complex to develop effective facilities for downstream migration. This situation is not restricted to France, since as yet, no country has found satisfactory solutions for downstream migration problems, especially where large installations are involved (EPRI, 1994).

Genetic comparisons of German populations of the stone crayfish, Austropotamobius torrentium (Crustacea: Astacidae)

Abstract: Austropotamobius torrentium (SCHRANK, 1803) is the smallest of the European native crayfish species and has probably never been of economic interest. It is confined to headwaters and adapted to cold water with high flow through and rocky environments. These properties make the stone crayfish a useful species for population genetics and phylogeographic studies. Representatives were collected from 18 localities throughout southern Germany and analysed with two mitochondrial genetic markers. Initial results revealed that German populations of A. torrentium from the Danube and Rhine tributaries share identical haplotypes in 528 basepairs of 16S rRNA and 658 basepairs of the COI gene. Rare haplotypes of the COI genes were occasionally encountered and apparently restricted to southwestern Bavaria. Only three variable sites were found over a length of 658 basepairs in 45 German, Swiss and Austrian stone crayfish resulting in five different haplotypes, with the prevalence of one most common haplotype. Here we show that in German populations rare haplotypes are not randomly distributed, but found in higher frequencies in the Bavarian Alps of the Allgau and in adjacent Tyrol. On the other hand, stone crayfish population from the Bavarian Forest and the Rhine tributaries appear genetically impoverished, so far only showing the most common haplotype. Consequently, there are significant differences between the Allgau populations and the rest of the German populations in haplotype frequencies, resulting in a relatively high F ST value. This finding is of importance for future conservation efforts of stone crayfish populations in Germany and Austria.

Initiation à la systématique des diatomées d'eau douce. Pour l'utilisation pratique d'un indice diatomique générique

Abstract: INTRODUCTION L E X I Q U E I L L U S T R E D E S T E R M E S UTILISES 3 LES DIATOMEES: C A R A C T E R E S G E N E R A U X 9 M o r p h o l o g i e g é n é r a l e 9 R e p r o d u c t i o n 9 E l é m e n t s d e B i o l o g i e g é n é r a l e 10 M A T E R I E L E T M E T H O D E S 10 L e m i c r o s c o p e 10 Pe t i t m a t é r i e l 10 d e r é c o l t e 10 d e p r é p a r a t i o n e t m o n t a g e 11 p r o d u i t s c h i m i q u e s 11 TECHNIQUES D'ETUDE: E c h a n t i l l o n n a g e 11 C o n s e r v a t i o n d e s é c h a n t i l l o n s 12 N e t t o y a g e 12 T r a i t e m e n t p a r g r i l l a g e 12 T r a i t e m e n t c h i m i q u e 12 #

Pool fishways, pre-barrages and natural bypass channels

Abstract: Pool fishways are based on the principle of dividing the height to be passed into several small drops forming a series of pools. The passage of water from one pool to another is either by surface overflow, through one or more notches or slots, or through one or several submerged orifices situated in the wall separating two pools. Hybrid pool fish passes can often be found, for example with flow through a notch or slot or over the dividing wall, combined with submerged flow through an orifice. The profile of the surface overflow weir is generally rectangular, but in some cases can be trapezoidal, triangular or even semicircular.