Feeding of twaite shad, Alosa fallax (Lacépède, 1803), during the upstream spawning migration in the River Ulla (NW Spain)

2013 ◽  
Vol 64 (3) ◽  
pp. 233 ◽  
Author(s):  
D. J. Nachón ◽  
J. Sánchez-Hernández ◽  
R. Vieira-Lanero ◽  
F. Cobo
Keyword(s):  
Stomach Content ◽  
Feeding Behaviour ◽  
Diet Composition ◽  
Aquatic Invertebrates ◽  
First Record ◽  
Spawning Migration ◽  
Important Food ◽  
Nw Spain ◽  
Twaite Shad ◽  
Alosa Fallax

In order to contribute to a better understanding of feeding behaviour of adult twaite shad, Alosa fallax, in freshwater, we studied the stomach content composition of 147 A. fallax during their upstream spawning migration in the River Ulla (Galicia, NW Spain). The diet composition included 34 types of prey, aquatic invertebrates being the most important food. The present study is, to the best of our knowledge, the first record of A. fallax feeding on potamodromous Pseudochondrostoma duriense.

Diet composition of adult twaite shad (Alosa fallax) in the Aegean Sea (Izmir Bay, Turkey)

2011 ◽  
Vol 92 (3) ◽  
pp. 601-604 ◽  
Author(s):  
Tevfik Ceyhan ◽  
Okan Akyol ◽  
T. Murat Sever ◽  
Ali Kara
Keyword(s):  
Prey Item ◽  
Diet Composition ◽  
Aegean Sea ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Izmir Bay ◽  
Engraulis Encrasicolus ◽  
Twaite Shad ◽  
Alosa Fallax ◽  
Prey Items

Specimens of twaite shad, Alosa fallax were sampled from commercial purse seiners and trammel netters in Izmir Bay during November and December 2007. A total of 287 prey items from 14 taxa from 208 stomachs were recorded. The primary food of twaite shad was found to be fish, especially anchovy Engraulis encrasicolus, which was the most frequent (%F = 66.11) and abundant (%N = 63.64) prey item, and also had the highest percentage by weight (%W = 81.91). Decapoda, Isopoda, Ostracoda and Copepoda (Calanus spp., Candocia armata, Temora stylifera from Calanoida and Corycaeus spp. from Cyclopodia), were recorded occasionally with low values for all indices. The study showed that in the Aegean Sea Alosa fallax is a predator of small pelagic fish, E. encrasicolus, A. boyeri, S. pilchardus, and some crustaceans. Benthopelagic P. acarne and demersal S. hepatus were first recorded in diet of twaite shad.

Marine and continental distribution and dynamic of the early spawning migration of twaite shad (Alosa fallax (Lacépède, 1803)) and allis shad (Alosa alosa (Linnaeus, 1758)) in the north-west of the Iberian Peninsula

2016 ◽  
Vol 67 (8) ◽  
pp. 1229 ◽  
Author(s):  
D. J. Nachón ◽  
M. Mota ◽  
C. Antunes ◽  
M. J. Servia ◽  
F. Cobo
Keyword(s):  
Iberian Peninsula ◽  
Habitats Directive ◽  
The European Union ◽  
North West ◽  
The North ◽  
Allis Shad ◽  
Alosa Alosa ◽  
Twaite Shad ◽  
In The Wild ◽  
Alosa Fallax

Knowledge regarding the marine phase of twaite shad (Alosa fallax (Lacépède, 1803)) and allis shad (Alosa alosa (Linnaeus, 1758)) remains limited. To understand the coastal and continental distribution and dynamic of migration of these species, in the present study we collected official data records of marine landings (kg), separated according to species, for all fish markets in Galicia (north-west of the Iberian Peninsula) and undertook freshwater field sampling campaigns. The findings indicate that both species of shad exhibit a coastal distribution near the rivers where they spawn, namely the Minho and Ulla rivers. Catches at sea declined from January, a phenomenon that can be understood as the onset of migration to the rivers. Bycatch reports are important because both A. fallax and A. alosa are listed in the Annex V of the European Union Habitats Directive, which lists animal species whose exploitation and taking in the wild may be subject to management measures. However, for a better management of these species it is necessary to understand the magnitude of displacements and connection of shad populations at sea.

scholarly journals Novel insights into the marine phase and river fidelity of anadromous twaite shad Alosa fallax in the UK and Ireland

2020 ◽  
Vol 30 (7) ◽  
pp. 1291-1298
Author(s):  
Peter Davies ◽  
Robert J. Britton ◽  
Andrew D. Nunn ◽  
Jamie R. Dodd ◽  
Charles Crundwell ◽  
...  
Keyword(s):  
Twaite Shad ◽  
Alosa Fallax ◽  
The Uk
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