Results 51 to 60 of about 6,082 (218)

OCCURRENCE OF NATIVE AND INTRODUCED CRAYFISH IN NORTHEASTERN GERMANY AND NORTHWESTERN POLAND.

Knowledge and Management of Aquatic Ecosystems, 2001
On the basis of monitoring undertaken in 300 lakes since 1994, the recent stocking situation for freshwater crayfish in northeastern Germany (Uckermark) and northwestern Poland (Szczecin area) is described. The two native species Astacus astacus (L.) and
SCHULZ R., SMIETANA P.
doaj   +1 more source

Современное распространение, морфологическая изменчивость и диагностика широкопалого рака Astacus astacus (Linnaeus, 1758) (Decapoda: Astacidae) в Украине [PDF]

, 2012
Исследование популяций пресноводных раков северо-востока Украины, проведенное путем анализа аллозимов и морфометрии, доказало, что в Украине, наряду с обычным раком длиннопалым Astacus leptodactylus сохранился исчезающий европейский вид рак широкопалый A.
Жалай, Е. И., Костюк, В. С., Межжерин, С. В.   +2 more
core  

Effects of Dietary Calcium and Magnesium Levels on the Growth Performance, Tissue Mineral Deposition, Exoskeleton Development, and Molting Performance of Chinese Mitten Crab (Eriocheir sinensis)

Aquaculture Nutrition, Volume 2026, Issue 1, 2026.
Calcium and magnesium are essential mineral elements for animal growth and development, playing crucial roles in skeletal formation, particularly in the molting process of crustaceans. However, their interaction is still poorly elucidated. This study investigated the effects of dietary calcium and magnesium levels on the growth performance, tissue ...
Han Chen, WenBin Liu, YueYun Guo, SiSi Xiong, ZiShang Liu, YanZou Dong, BeiLe Ye, Lei Xu, Pan Wang, XiangFei Li, Xianyong Bu   +10 more
wiley   +1 more source

Der Edelkrebs (Astacus astacus) im Kreis Höxter [PDF]

, 2013
Bis Ende des 19. Jahrhunderts waren in den Gewässern Deutschlands drei Flusskrebsarten beheimatet. Während der Edelkrebs (Astacus astacus; Abb. 1) ursprünglich in ganz Deutschland anzutreffen war, beschränkten sich die Vorkommen des Dohlenkrebses ...
Beinlich, Burkhard
core  

Chemical changes in the adductor muscle of the cheliped of the crayfish in relation to the double motor innervation [PDF]

, 1938
Work from this laboratory has shown that a number of the striated muscles of the legs of the crayfish show a typical motor innervation (1). Such muscles are innervated by two motor fibers only, each causing a different type of contraction.
Bergren, W. R., Wiersma, C. A. G.
core   +2 more sources

Status and management of noble crayfishAstacus astacusin Estonia [PDF]

Knowledge and Management of Aquatic Ecosystems, 2009
Noble crayfish Astacus astacus (L.) is an indigenous and the only crayfish species in Estonia. It is potentially endangered by invasion of alien species, diseases and habitat deterioration but does not have legal protected status and is fished only for recreational purpose. Crayfish Working Group of Ministry of Environment and Department of Aquaculture
T. Paaver, M. Hurt
openaire   +2 more sources

Artificial Incubation and Juvenile Cultivation Strategies for Cherax quadricarinatus: Microbial Dynamics and Greenhouse Pond Optimization

Aquaculture Research, Volume 2026, Issue 1, 2026.
To address key issues in the breeding and aquaculture of Cherax quadricarinatus, two experiments were conducted based on existing research. The first experiment investigated the effects of four disinfection methods on the microbial community and diversity indices on the surface of isolated embryos, with three replicates per group. Previous studies were
Li Fei, Han Ying-li, Cheng Shun, Chi Mei-li, Liu Shi-li, Jiang Wen-ping, Zheng Jian-bo, Zhu Chao   +7 more
wiley   +1 more source

Genetic diversity of noble crayfish in Finland based on ITS1 microsatellite-like repeat variation: implications to the conservation and management

Knowledge and Management of Aquatic Ecosystems
During the last two centuries, native noble crayfish (Astacus astacus) has been introduced and re-introduced into many waters in Finland, to widen the area of distribution, and to re-establish the collapsed populations.
Karjalainen Anna, Halmekytö Maria, Mononen Jaakko, Kortet Raine, Kokko Harri   +4 more
doaj   +1 more source

Effects of Prawn Shell Meal Diets on Hemocyte Count, Hemolymph Clotting, and Sperm Quality of the Freshwater Prawn Macrobrachium caementarius

Aquaculture Research, Volume 2026, Issue 1, 2026.
Crustacean shells are composed of chitin, which is bound to protein and minerals, along with other essential nutrients. These components are necessary for growth, immune response, the formation of reproductive structures, and the enhancement of sperm quality.
Walter Reyes-Avalos, Gladis Melgarejo-Velásquez, Carlos Azañero-Díaz, Carmen Yzásiga-Barrera, Sorayda Mendoza-Espinoza, Sonia Arroyo-Corales   +5 more
wiley   +1 more source

CRAYFISH OCCURRENCE IN RELATION TO LAND-USE PROPERTIES: IMPLEMENTATION OF A GEOGRAPHIC INFORMATION SYSTEM (GIS)

Knowledge and Management of Aquatic Ecosystems, 2002
On the basis of inventory data collected since 1994, the recent stocking situation for freshwater crayfish in three 10 by 10 km study sites in northeastern Germany (Uckermark) and northwestern Poland (Szczecin area, Koszalin area) is described.
SCHULZ H. K., SMIETANA P., SCHULZ R.
doaj   +1 more source