Length-Weight Relationships (LWRs) of Four Loach Species of the Cobitidae Family from the Surma River, Bangladesh

Table 2

Summary statistics (mean ± 95% CI) of length-weight relationships , condition factor (K), confidence interval (CI), and relative condition factors (Kn) for four species of loaches from the Cobitidae family in the Surma River, Bangladesh.

Species	Lepidocephalichthys annandalei (Chaudhuri, 1912)			Lepidocephalichthys thermalis (Valenciennes, 1846)			Lepidocephalichthys guntea (Hamilton, 1822)			Lepidocephalichthys berdmorei (Blyth, 1860)
Size of sample (n)	Total 59	Male 23 (38.98%)	Female 36 (61.02%)	Total 95	Male 27 (28.42%)	Female 68 (71.58%)	Total 137	Male 76 (55.47%)	Female 61 (44.53%)	Total 85	Male 67 (78.82%)	Female 18 (21.18%)
Total length range (cm)	6.8–9.0	6.8–9.0	6.6–8.9	6.5–9.1	6.8–8.6	6.5–8.7	7.9–9.1	8.2–8.9	8.1–9.0	6.8–9.1	6.8–8.9	6.9–9.1
Total weight range (g)	2.1–5.8	2.2–5.3	2.1–5.2	1.6–5.0	1.8–5.0	2.6–4.8	3.0–6.1	3.4–6.0	3.1–5.9	2.0–5.8	2.1–5.8	2.0–5.2
Parameter (a)	0.006	0.007	0.007	0.006	0.00	0.003	0.005	0.005	0.008	0.004	0.030	0.036
Parameter (b)	3.073	2.992	3.061	3.296	3.27	3.148	3.261	3.236	3.208	3.335	2.417	2.438
95% CI of a	0.004–0.008	0.007–0.008	0.006–0.008	0.002–0.009	0.004–0.005	0.003–0.004	0.001–0.008	0.004–0.005	0.006–0.009	0.003–0.004	0.025–0.035	0.028–0.045
95% CI of b	2.957–3.190	2.958–3.027	2.995–3.127	2.878–3.715	3.171–3.369	3.319–3.518	3.018–3.505	3.170–3.302	3.070–3.346	3.236–3.435	2.324–2.511	2.316–2.560
t value	1.228	−0.454	1.812	1.386	5.345	2.915	2.101	7.008	2.954	6.599	−12.221	−9.029
Sig.	0.222	0.652	0.074	0.167	<0.001	0.004	0.037	<0.001	0.004	<0.001	<0.001	<0.001
Growth pattern	Isometric	Isometric	Isometric	Isometric	Positive allometric	Positive allometric	Positive allometric	Positive allometric	Positive allometric	Positive allometric	Negative allometric	Negative allometric
Condition factor (K)	0.725	0.734	0.725	0.697	0.714	0.713	0.729	0.735	0.738	0.699	0.702	0.692
Relative condition factor (Kn)	1.008	1.019	1.021	0.953	1.016	1.013	1.032	1.025	1.033	0.938	1.007	1.011
	0.899	0.880	0.889	0.807	0.807	0.940	0.677	0.619	0.640	0.919	0.734	0.687