Acta Nat. Sci.   |  e-ISSN: 2718-0638

Original article | Acta Natura et Scientia 2022, Vol. 3(2) 163-183

Impact of Stocking Density on the Survival, Growth and Injury of Narrow-Clawed Crayfish (Pontastacus leptodactylus) Reared in a Flowing Brackish Water System 

Yavuz Mazlum & Cumhur Uzun

pp. 163 - 183   |  DOI: https://doi.org/10.29329/actanatsci.2022.352.08   |  Manu. Number: MANU-2210-16-0003.R1

Published online: December 09, 2022  |   Number of Views: 79  |  Number of Download: 320


Abstract

The crayfish population dramatically declined in most lakes and dams in Türkiye; hence, crayfish culture is a possible option to increase the supply. This study aimed to determine the effects of stocking density on the growth performance and survival of newly-hatched third instars of narrow-clawed crayfish (Pontastacus leptodactylus) in a flowing brackish water system. The third instars were randomly stocked in nine tanks (area: 1.7 m^{2}) for 120 days with three densities of 10, 50, and 100 crayfish/m^{2}. The results indicated that the stocking density significantly affected the growth performance, survival rate, proportion of the cheliped injury, biomass, length distribution, and feed conversion ratio (FCR). The mean final weights and total lengths were 2.27, 1.40, and 1.08 g and 4.83, 3.73 and 3.51 cm according to the densities, respectively. The highest stocking density increased the total biomass yield and proportion of the cheliped injury but reduced the survival, growth, molting frequency and regeneration of the appendage. The survival (86.3%) and specific growth rate (1.16 cm/day) in the 10 individuals/m^{2} group were significantly higher than the other groups. The cheliped injury was also found to be the lowest in the 10 individual/m^{2} group (p<0.05). Our study results showed that significant differences in FCR value were observed at different stocking densities. In summary, higher stocking density at the end of this study increased the frequency and severity of aggressive interactions of crayfish, limiting molting frequency and growth performance. A density of 10-50 crayfish/m^{2} is recommended for better growth parameters while 100 crayfish/m^{2} is suggested for higher biomass yield.

Keywords: Freshwater crayfish, Pontastacus leptodactylus, Stocking density, Growth, Brackish water, Cheliped injury, Molting


How to Cite this Article?

APA 6th edition
Mazlum, Y. & Uzun, C. (2022). Impact of Stocking Density on the Survival, Growth and Injury of Narrow-Clawed Crayfish (Pontastacus leptodactylus) Reared in a Flowing Brackish Water System  . Acta Natura et Scientia, 3(2), 163-183. doi: 10.29329/actanatsci.2022.352.08

Harvard
Mazlum, Y. and Uzun, C. (2022). Impact of Stocking Density on the Survival, Growth and Injury of Narrow-Clawed Crayfish (Pontastacus leptodactylus) Reared in a Flowing Brackish Water System  . Acta Natura et Scientia, 3(2), pp. 163-183.

Chicago 16th edition
Mazlum, Yavuz and Cumhur Uzun (2022). "Impact of Stocking Density on the Survival, Growth and Injury of Narrow-Clawed Crayfish (Pontastacus leptodactylus) Reared in a Flowing Brackish Water System  ". Acta Natura et Scientia 3 (2):163-183. doi:10.29329/actanatsci.2022.352.08.

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