Comparison of Electronic Length Frequency Analysis (ELEFAN) for Estimation of Growth Parameters for Lollyfish, Holothuria (Holothuria) atra and Sand Sea Cucumber, Holothuria (Thymiosycia) arenicola (Holothuroidea: Echinodermata) in the North Arabian Sea, Pakistan

Authors : Quratulan AHMED, Sabri BİLGİN, Qadeer Mohammad ALİ

Pages : 145-158

Doi:10.33714/masteb.744301

View : 18 | Download : 8

Publication Date : 2020-12-31

Article Type : Research Paper

Abstract :To estimate the growth parameters, the non-seasonal von Bertalanffy and Hoenig seasonal von Bertalanffy models were fitted to the length frequency data of Holothuria atra and H. arenicola obtained from coastal areas of Karachi in the northern Arabian Sea, Pakistan between January and December 2014. The Hoenig seasonal von Bertalanffy growth parameters were estimated as L ∞ =36.1 cm total length insert ignore into journalissuearticles values(TL);, K =0.75 year -1 for H. atra and as L ∞ =34.9 cm TL, K =0.70 year -1 for H. arenicola . H. atra individuals reached 73.9% of their maximum total length at the one year old. For H. arenicola it was calculated as 72.7%. Monthly mean growth rate of H. atra at the same ages was calculated higher than H. arenicola . The seasonal oscillation in growth rate for H. atra insert ignore into journalissuearticles values( C =0.50); was larger than it was for H. arenicola insert ignore into journalissuearticles values( C =0.37);. The time of the year when the growth is slowest corresponded to the middle of April insert ignore into journalissuearticles values(WP=0.30); in H. atra and at the beginning of August insert ignore into journalissuearticles values(WP=0.60); in H. arenicola may be the result of the extended both reproduction and poor nutrition periods due to monsoonal effects on the marine environment. The relatively high growth rates insert ignore into journalissuearticles values( K >0.7 year -1 ); of these two species may have important implications for high survival rate, particularly in environmental condition where cause biological stress and marine confusion but may also increase their potential as a candidate species for aquaculture.
Keywords : Arabian Sea, Biological Stress, Seasonal Growth, Sea Cucumber