Channa striatus, (Bloch, 1793), Bloch, 1793

Manikandaraja & Kumar, Ananth, 2024, Studies on length and weight relationship of Indian snakehead Channa striatus, International Journal of Fisheries and Aquatic Studies 12 (2), pp. 17-22 : 18

Length and weight comparison between captured and cultured C. striatus

Experiment: I

Length of captured C. striatus (Nagercoil) in comparison to captured C. striatus (Melapalayam) and cultivated C. striatus (Care, Araikulam, Kaliyavoor, and Veeralaperunselvi)

When the length of a wild Channa striatus taken from Nagercoil was compared to all four cultured C. striatus of CARE, Araikulam, Kaliyaoor, and Veeralaperunselvi, significant (p <0.05) variances were noted. The maximum length of the wild C. striatus Nagercoil was 40.36 cm, and it differed from the CARE sample length (32.9 cm) (DF=29; F=9.744; p=0.005), Araikulam (38.03 cm) (DF=29; F=3.202; p=0.04), Kaliyavoor (35.56 cm) (DF=29; F=1.872; p=0.03), and Veeralaperunselvi (39.13 cm) (DF=29; F=4. 010; p=0.03) all significantly (p <0.05). Likewise, there was a significant (p <0.05) difference between the wild C. striatus in Nagercoil and the wild C. striatus in Melapalayam (43.3 cm) (DF=29; F=2.306; p=0.03).

Weight of captured C. striatus (Nagercoil) in comparison to captured C. striatus (Melapalayam) and cultured C. striatus (Care, Araikulam, Kaliyavoor and Veeralaperunselvi)

When the weight of the wild Channa striatus taken from Nagercoil was compared with all four of the farmed C. striatus of Care, Araikulam, Kaliyavoor, and Veeralaperunselvi, significant (p <0.05) variances were noted. Nagercoil wild C. striatus had a maximum weight of 653.5 gm, which differed considerably (p <0.05) from Araikulam (583.50 gm) (DF=29; F=3.404; p=0.001) and CARE (501.16 gm) (DF=29; F=1.816; p=0.057), Veeralaperunselvi (579.50 gm) (DF=29; F=4.564; p=0.000) and Kaliyavoor (410.05 gm) (DF=29; F=1.792; p=0.067). Likewise, there was a significant (p <0.05) difference between the wild C. striatus Nagercoil and the wild C. striatus Melapalayam (651.5 gm) (DF=29; F=4.330; p=0.000).

Experiment: II

Length of captured C. striatus (Melapalayam) in comparison to captured C. striatus (Nagercoil) and cultured C. striatus (CARE, Araikulam, Kaliyavoor, and Veeralaperunselvi)

When the length of a wild Channa striatus obtained from Melapalayam was compared to all four cultured C. striatus of CARE, Araikulam, Kaliyaoor, and Veeralaperunselvi, significant (p <0.05) variances were noted. The longest recorded length of Melapalayam wild C. striatus was 43.3 cm; this was significantly (p <0.05) longer than the longest recorded lengths of CARE (32.9 cm; DF=29; F=1.622; p=0.123), Araikulam (38.03 cm; DF=29; F=2.897; p=0.005), Kaliyavoor (35.56 cm; DF=29; F=2.323; p=0.022), and Veeralaperunselvi (39.13 cm) (DF=29; F=2.487; p=0.015). Likewise, there was a significant (p <0.05) difference between the wild C. striatus from Melapalayam and the wild C. striatus Nagercoil (40.36 cm) (DF=29; F=2.130; p=0.036).

Weight of C. striatus captured (Melapalayam) in contrast to captured C. striatus (Nagercoil) and Cultured C. striatus (Care, Araikulam, Kaliyavoor, and Veeralaperunselvi) When the weight of four cultured C. striatus from CARE— Araikulam, Kaliyavoor, Veeralaperunselvi, and Melapalayam was compared with that of wild C. striatus , significant (p <0.05) differences were found. The weight of CARE (501.16 gm) (DF=29; F=4.152; p=0.000) was considerably (p <0.05) different from the weight of Melapalayam wild C. striatus , which weighed 651.5 gm. Three samples were analyzed: Veeralaperunselvi (579.50 gm), Kaliyavoor (410.05 gm) (DF=29; F=5.059; p=0.000), and Araikulam (583.50 gm) (DF=29; F=4.533; p=0.000). Likewise, there was a substantial (p <0.05) difference between the captured C. striatus Nagercoil (653.5gm) and the wild C. striatus from Melapalayam (DF=29; F=8.346; p=0.000).

Tables 2.3 and 2.4 show the sample size, weights, and lengths and weights of both captured and cultured C. striatus , along with their lowest and maximum means and standard deviations. In every sample, the sample size varied from thirty. The caught sample obtained from Nagercoil has an R2 value of 0.745 ( Fig. 2E), while the C. striatus sample taken from Melapalayam Fish Market (Fig. 2F), Tirunelveli, has an R2 value of 0.532. The R2 values for the cultured samples obtained from CARE are 0.797 (Fig. 2G), 0.368 (Fig. 2I), 0.807 (Fig. 2J), and 0.801 (Fig. 2H ) for veeralaperumselvi, kaliyavoor, and C. striatus cultivated at Arasan Aqua Farm, Araikulam, Tirunelveli. When compared to all other b values, the value of b for C. striatus cultivated in Kaliyavoor was likewise extremely low (0.359). The growth of three grown samples (CARE, Araikulam, and Veeralaperumselvi) and two caught samples (Nagercoil and Melapalayam) was positively allometric, whereas the C. striatus cultured at Kaliyavoor was negatively allometric. Haniffa et al., 2006 [ 24] have observed a negative allometric growth pattern in C. punctata . Fig. 2K displays a graphic representation of the condition parameters of C. striatus that has been captured and cultured.

Figures

Fig 2E: Lenth - Weight relationships of captured C. striatus at Nagerkoil