Some reproductive characteristics of the Oriental River Prawn Macrobrachium nipponense in Anzali wetland

Articles in Press

Document Type : Biology(Animal)

Authors

1 Inland waters Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO), P.O. Box 66, Bandar-e Anzali, Iran

2 Inland Water Aquaculture Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO), Bandar Anzali

3 Taleghani Street

10.22034/aej.2020.257441.2407

Abstract

Some reproductive characteristics of the non native oriental river prawn Macrobrachium nipponense were monthly studied in Anzali Wetland. Totally more than 2,500 prawns were caught and examined during this period, with maximum and minimum lengths of 97 and 10.05 mm and weight of 0.02 to 13 g, respectively. The average length of shrimp was 45.7 ± 14 14.3 mm and the mean weight was 1.4 ± 1.376 g. The sex ratio of females to males was 1.1 ± 0.4 on average, which during the peak spawning months, this ratio is more inclined to females. Examining some of the reproductive factors of 244 ovigerous females within the length of 38 to 92.7 mm with an average length of 56 8± 8.2 mm showed that the most frequent length and weight classes were 50 to 60 mm in length and 2 to 3 grams in weight, respectively. The minimum oviposition length was 38 mm. Total fecundity was observed 75 to 4146 oval eggs with short diameter 0.35 to 0.8 mm and long diameter 0.5 to 1.0 millimeters. The number of eggs hatched by shrimp was linearly correlated with total length and weight of shrimp. Reproductive efficiency ranged from 0.01 to 0.19. Although its fecundity is lower than other economical species of Macrobrachium, other characteristics such as reasonable reproductive output and long reproduction period can make them suitable option in aquaculture.

Keywords

Journal of Animal Environment

Articles in Press, Accepted Manuscript
Available Online from 13 April 2022

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