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Length-Weight Relationship and Condition Factor of Mudskipper Boleophthalmus pectinirostris from Maro Estuary, Merauke Regency, Papua

Sunarni, Melmambessy Edy H. P., Mote Norce, Rahmatia, Hamuna Baigo

Journal of Ecological Engineering

2019

Vol. 20, nr 8

199--204

This study aimed at analyzing the length-weight relationship and the condition factors of Boleophthalmus pectinirostris originating from the Maro estuary, Merauke Regency, Papua Province, Indonesia. This study was conducted for three months, starting from July to September 2018. This study used a purposive sampling method. The sampling of B. pectinirostris was carried out at two stations by using traps and capturing manually. 80 fish of B. pectinirostris were caught during the study. The length size of males 6.5 to 17.5 cm and weight 1.7 to 44.0 g, while the length of females 9.0 to 22.0 cm and weight 5.4 to 91.4 g. The results showed that the length-weight relationship of B. pectinirostris male reached W=0.0112L2.8562 and W = 0.0099L2.8885, while females W = 0.0062L3.0907 and W = 0.0052L3.1211. The length and weight relationship of B. pectinirostris showed negative allometric for male (b<3) and positive allometric for female (b>3). The condition factor value of B. pectinirostris for males and females ranged from 0.837 to 2.266, and 0.689 to 1.259, respectively.

Population structure, morphometry and individual condition of the non-native crab Rhithropanopeus harrisii (Gould, 1841), a recent coloniser of the Gulf of Gdańsk (southern Baltic Sea)

Hegele-Drywa J., Normant M., Szwarc B., Podłuska A.

Oceanologia

2014

No. 56 (4)

805--824

The aim of this study was to characterise the introduced North American Harris mud crab Rhithropanopeus harrisii, which occurs in the Gulf of Gdańsk, Poland (southern Baltic Sea). Of the 920 specimens caught between 2006 and 2010, males and females made up 44 and 40% respectively, whereas juveniles (<4.4 mm carapace width) comprised 16%. Overall carapace widths ranged from 1.96 mm to 21.40 mm (mean 9.03±4.11 mm). Ovigerous females (mean 11.12±2.76 mm) were present in the population from June to October. Most of the adult specimens collected (n = 158) had carapace widths between 10.1 and 12.0 mm. The wet weight of R. harrisii varied from 0.005 to 4.446 g (mean 0.410±0.569 g). Females exhibited a negative allometric increase in weight (b = 2.77), males an isometric increase in weight (b = 3.02). The condition factor (K) in R. harrisii varied from 0.02 to 0.08 (mean 0.05±0.01).