the length-weight relationship (lwr) and condition factors (cf) of 180 the oriental river prawn macrobrachium nipponense collected from southern coasts of the caspian sea from may through september 2012 were studied. shrimp samples were taken and immediately transferred to the laboratory of fish biology at university of guilan for further analyses. length, weight and other external features of ...

In the present investigation, vitellogenesis during ovarian development in the freshwater prawn Macrobrachium rosenbergii was assessed. Ovarian development was classified into five stages based on size, colour and texture of ovary. Interestingly, histological results clearly indicate that the oocyte development gradually increased from stages I to V based on the yolk material accumulation. Besi...

Lectins play important role in innate immunity of animals. The affinity of the natural haemagglutinin of the giant freshwater prawn Macrobrachium rosenbergii towards vertebrate erythrocytes and its level with relation to sex, size and moult stages were studied. The strongest agglutinating titres in haemolymph of prawns were marked against guinea pig, chicken, Clarias batrachus, and rabbit eryth...

Macrobrachium prabhakarani new species is described from the Vamanapuram River, Kerala, S. India. The species shares certain characters with M. scabriculum and M. madhusoodani, while it differs remarkably from these two species in distinctive diagnostic characters: rostral formula 12–14/1–2 with 5–7 postorbital teeth; carapace smooth with distal end of rostrum directed forwards; chelae with nin...

Behavioural toxicity is a very applicable area in the vast field of ecotoxicology where, assessment alteration behaviour an effective tool to evaluate neural activity organism. In our present study, we have shown that arsenic trioxide exposure can stimulate repetitive grooming freshwater prawn, Macrobrachium lamarrei; however, over time organism modulate performances less. We predict repetition...

Freshwater prawns, Macrobrachium lamarrei (Crustacea-Decapoda) were subjected to static subacute exposure (0.755 mg/l) of detergent, Linear Alkyl Benzene Sulphonate (LAS) (25% 96h LC50) for 10,20 & 30 days. Hepatopancreas showed pronounced changes like vacuolization, hypertrophy, hyperplasia and degenerative leading almost complete loss histoarchitecture after days exposure. Peculiar cell shedd...