Feeding of juvenile twaite shad (Alosa fallax Lacepede, 1803) in the Elbe estuary.

被引:7
作者
Oesmann, S [1 ]
Thiel, R [1 ]
机构
[1] Univ Hamburg, Inst Hydrobiol & Fishery Sci, Elbelab, D-22767 Hamburg, Germany
来源
BULLETIN FRANCAIS DE LA PECHE ET DE LA PISCICULTURE | 2001年 / 362-63期
关键词
twaite shad; Elbe estuary; Alosa fallax; food composition; selection; daily ration;
D O I
10.1051/kmae:2001019
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Seasonal, diurnal and size-dependent trends of food composition, prey selection and daily ration of juvenile twaite shad were investigated in the! Elbe estuary. Juvenile twaite shad were caught for diet analysis with framed gape stow nets in the mesohaline region of the Elbe estuary in April, July and August 1991 Copepods, mysids and fish were identified as main food items of juvenile twaite shad. In August, the importance of mysids and fish as main prey organisms increased with increasing total length of twaite shad, whereas the proportion of copepods decreased. During night fishes were consumed to a lesser extent than during day. Insects were mainly eaten during night. In the early morning copepods were main food items. Juvenile twaite shad preferred the mysidacean Mesopodopsis slabbed and the sprat Sprattus sprattus. Cladocerans were ingested corresponding to their availability, whereas all other food items were avoided. Daily,ration according to WINBERG (1956) showed peak values in spring and summer and decreased during the following season. The maximum daily ration of about 45% of body wet weight was calculated in May. Daily ration decreased with increasing age of juvenile twaite shad.
引用
收藏
页码:785 / 800
页数:16
相关论文
共 47 条
[1]   THE DIET OF JUVENILE AND ADULT TWAITE SHAD ALOSA-FALLAX-FALLAX (LACEPEDE) FROM THE RIVERS SEVERN AND WYE (BRITAIN) [J].
APRAHAMIAN, MW .
HYDROBIOLOGIA, 1989, 179 (02) :173-182
[2]  
*ARGE ELBE, 1992, SALZG TRUBST OB BRAC
[3]   FOOD-CONSUMPTION OF LARVAL, YOUNG AND ADULT HERRING AND SPRAT IN THE BALTIC SEA [J].
ARRHENIUS, F ;
HANSSON, S .
MARINE ECOLOGY PROGRESS SERIES, 1993, 96 (02) :125-137
[4]   DIET OF THE TWAITE SHAD ALOSA-FALLAX (LACEPEDE) (CLUPEIDAE) IN THE RIVER TAGUS ESTUARY, PORTUGAL [J].
ASSIS, CA ;
ALMEIDA, PR ;
MOREIRA, F ;
COSTA, JL ;
COSTA, MJ .
JOURNAL OF FISH BIOLOGY, 1992, 41 (06) :1049-1050
[5]  
BLAXTER JHS, 1982, ADV MAR BIOL, V20, P3
[6]  
Bracken J., 1967, IRISH FISHERIES IN B, V3, P4
[7]  
BRETT JR, 1983, COST SURVIVAL VERTEB, P29
[8]  
DIECKWISCH B, 1987, THESIS C ALBRECHTS U
[9]   SOME RECENT METHODS FOR ESTIMATING FOOD-CONSUMPTION BY FISH - REPLY [J].
EGGERS, DM .
JOURNAL OF THE FISHERIES RESEARCH BOARD OF CANADA, 1979, 36 (08) :1018-1019
[10]  
EHRENBAUM E, 1894, WISSENSCHAFTLICHE ME, V1, P54