Get Spawning Migration of the European Eel: Reproduction index, PDF

By Guido van den Thillart, Sylvie Dufour, J. Cliff Rankin

ISBN-10: 1402090943

ISBN-13: 9781402090943

The eu eel Anguilla anguilla is a standard fish species in West ecu international locations helping a number of hundreds of thousands of small-scale fisheries. In June 2007, it's been indexed in Annex B of CITES after the ninety nine% decline in recruitment saw during the last a long time. a eu Council law was once issued on September 2007 to arrest the cave in of the eel inventory. during this publication, we speak about the standards that can give a contribution to the cave in of the ecu eel inhabitants. With appreciate to conservation measures very important facets must be thought of: caliber and volume of escaping silver eels. in actual fact, a bad of the silver eels can by no means be compensated through huge numbers. Qualitative parameters have been up to now not often on hand for administration purposes. the most aim of this e-book is to supply priceless caliber parameters for migrating silver eels, indicating their contribution to recruitment. the method of migration and maturation additionally offers information regarding the average stipulations for eel copy. for this reason, this publication can also be very worthwhile for eel aquaculture; it might probably offer instruments for replica in addition to for suppression of precocious maturation. An integrative method concerning eel maturation calls for a mix of ecology and body structure. during this ebook we integrated either elements, and we are hoping that it will give a contribution to the recovery of the ecu eel inhabitants.

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Extra resources for Spawning Migration of the European Eel: Reproduction index, a useful tool for conservation management (Fish & Fisheries Series)

Sample text

Salmo salar (Hoar 1939). The involvement of the thyroid axis in the control of smolting was later confirmed by Fontaine and Leloup (1960) by physico-chemical studies and more recently reviewed by Boeuf (1993). The administration of exogenous TH to juvenile parr – status salmonids results in morphological and physiological changes consistent with the parr – smolt transformation (for review: Boeuf 1993). For example, treatments with THs or with TSH have been able to induce the characteristic color change (silvering) of the skin, via an effect on purine and pteridine deposition (Chua and Eales 1971; Premdas and Eales 1976; Miwa and Inui 1985; Coughlin et al.

Concerning the early stages of gametogenesis and the control of puberty, the possible involvement of DA has only been studied, up to now, in bass, bream eel and mullet. In juvenile striped bass (Holland et al. 1998) and red seabream (Kumakura et al. 2003), data refuted a role for DA in the prepubertal control of gonadotropins, as GnRH alone was able to trigger precocious puberty. In contrast, in European eel, only a triple treatment with testosterone, GnRH agonist and pimozide (DA D2-type receptor antagonist) could induce increases in LH synthesis and release, indicating that removal of DA inhibition is required in the prepubertal eel for triggering GnRH-stimulated LH synthesis and release (Dufour et al.

During the transition from yellow to silver eel, increase in eye diameter and in retina surface area can be observed (Pankhurst 1982b). Moreover, structural modifications of the retina were reported, with an increase in the number of rods and a decrease in the number of cones (Pankhurst and Lythgoe 1983; Braekevelt 1985, 1988a). Finally, there is also change in visual pigment at the chromophore level with a predominance of rhodopsin in silver eels compared to porphyropsin in yellow eels (Carlisle and Denton 1959), which increases the blue light sensitivity of rods (Wood and Partridge 1993; Archer et al.

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Spawning Migration of the European Eel: Reproduction index, a useful tool for conservation management (Fish & Fisheries Series) by Guido van den Thillart, Sylvie Dufour, J. Cliff Rankin

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