Table 4. Principal component analysis correlation for 29 morphological characters in percentages of specimens of Gnathonemus petersii (n = 119) according to the first four axes

Characters	PCA1	PCA2	PCA3	PCA4
BD%SL	0.100327	–0.20547	–0.11291	–0.051338
HL%SL	–0.055803	–0.13953	0.027644	0.03144492
PDD%SL	–0.007756	–0.043839	0.16969	–0.007377
PAD%SL	–0.03157	–0.15988	0.2440005	0.035016
PPID%SL	–0.019866	–0.1244449	0.1196	0.061112
PPcD%SL	–0.02894488	–0.070792	–0.002801	0.073372
DFL%SL	0.103313	0.13383	–0.22481	–0.102
DFH%SL	–0.017017	–0.005896	0.032284	–0.102844
AFL%SL	0.046542	0.092232	–0.11727	–0.11362
PIFL%SL	0.0014866	1,12E–02*	0.0018565	–0.020714
PcFL%SL	–0.011596	–0.018938	0.017774	0.0333
D-PIF-AF%SL	0.466422	0.0078618	0.13405	–0.0284655
D-PcF-AF%SL	0.055623	–0.062373	0.31539*	–0.19036
D-PcF-PIF%SL	0.032116	–0.03349	0.19096	–0.12789
D-DF-AF%SL	0.064444	–0.092	–0.047715	–0.038536
CPL%SL	–0.037044	–0.040335	0.051702	0.039224
CPH%SL	–0.008426	–0.023506	0.047281	0.007211
CPD%SL	0.001108	–0.027248	0.048743	3–0.039608
HD%HL	0.88079	–0.32861*	–0.10603	0.19284
HW%HL	0.28741	0.13957	0.42363*	–0.65077
SnL%HL	0.093851	0.21127*	0.26092	0.035043
ED%HL	–0.070074	0.038237	0.20123	0.19198
IoW%HL	–0.008778	0.064079	0.40923*	–0.65077
PoL%HL	0.094539	0.13839	0.39601*	0.61776
DNN%HL	0.030361	0.08125	0.033763	0.030726
DNE%HL	0.11376	0.087349	–0.028255	–0.043958
MW%HL	0.042283	0.10084	0.029503	0.055463
CIL%HL	0.24847	0.79109*	-0.16825	0.076829

The most important loadings.
PCA, principal component analysis; PCA1, first axis; PCA2, second axis; PCA3, third axis; PCA4, fourth axis; SL, standard length; BD, body depth; HL, head length; PDD, predorsal distance; PAD, preanl distance; PPID, prepelvic distance; PPcD, prepectoral distance; DFL, dorsal fin length; DFH, dorsal fin height; AFL, anal fin length; PIFL, pelvic fin length; PcFL, pectoral fin length; D-PIF-AF, distance between pelvic and anal fin; D-PcF-AF, distance between pectoral and anal fin; D-PcF-PIF, Distance between pectoral and pelvic fin; D-DF-AF, distance between dorsal and anal fin; CPL, caudal peduncle length; CPH, caudal peduncle height; CPD, caudal peduncle depth; HD, head depth; HW, head width; SnL, snout length; ED, eye diameter; IoW, inter orbital width; PoL, post orbital length; DNN, distance between nostrils; DNE, distance between nostril and eye; MW, mouth width; CIL, chin lobe length.