Sex-ratio, length-weight relationship, condition factor, food and feeding habits of Garrarndembecha (n=580) and Clarias gariepinus (n=121) in Lake Hayq were studied fromrnmonthly samples collected by gillnets of various stretched mesh sizes (3, 5, 8, 10 and 12rncm) and long lines between January 2009 and June 2009. Length of G. dembecha rangedrnform 8 to 13.3 cm for females and from 8 to 14 cm for males. Length of C. gariepinusrnranged from 25 to 77 cm for females and from 20.5 to 50 cm for males. Male to femalernratio was in favor of males in the total sample of G. dembecha (1.33:1). Sex-ratio wasrnsignificantly different from 1:1 in three of the six sampling months and also in the totalrnsample. Female preponderance over males in the total sample of C. gariepinus (1.02:1)rnwas observed. Sex-ratio was not significantly different from 1:1 in the total sample of C.rngariepinus. The relationship between total length (range: 8-14 cm) and total weightrn(range: 6-45 gm) of G. dembecha was found to be curvilinear and statistically significantrn(p0.05).Thus, growth ofrnthe fish was isometric. The corresponding equations were represented by: Males: TW =rn0.0038x TL 3.144 and Females: TW =0.012x TL 3.109 . The relationship between totalrnlength (range: 20.5-77 cm) and total weight (range: 75-3500 gm) of C. gariepinus wasrnfound to be curvilinear and statistically significant (p0.05). The corresponding equations were represented by: Males: TW= 0.005x TL3.038 and Females: TW=0.002x TL3.274 . MonthlyrnFCF of G. dembecha in this study ranged from 0.8 to 1.73 for females, and from 0.82 torn1.84 for males. Mean FCF+ SE was found to be 1.25+ 0.02 and 1.33 + 0.01 for femalesrnand males, respectively, with an overall value of 1.30 + 0.01. Generally, males had largerrnFCF values than females. Monthly FCF of C. gariepinus in this study ranged from 0.50rnto 1.15 for females, and from 0.48 to 1.10 for males. Mean FCF+ SE was 0.69 + 0.02 andrn0.67+ 0.02 for females and males, respectively. The overall Mean + SE FCF was 0.68+rn0.02. Generally females had larger FCF than males. Based on a total of 476 gut samplesrnof G. dembecha, the fish was found to ingest a wide spectrum of food items, rangingrnfrom various types of phytoplankton to zooplankton, and to sand particles and detritus.rnThe predominant food items, in terms of frequency of occurrence, were Melosira,rnTetraedron, Amphora, Nitzchia, Cymbella, Microcystis, Fragillaria, Cosmarium,rnSuririella, Navicula and Daphnia. Numerically, Nitzchia, Tetraedron, Cosmarium andrnMelosira dominated the food of G. dembecha. The contribution of Daphnia was low.rnMoreover, the fish had ingested detritus, and sand grains. Stomach content samples (n=rn121) of C. gariepinus showed that C. gariepinus feeds on a variety of items of both plantrnand animal origin ranging from phytoplankton to zooplankton, to insects and fish.rnMacrophyte shoots and detritus were also among the most frequently found items. Thernpredominant food items in terms of frequency of occurrence were crustaceans, followedrnby insects and fish. Numerically as well, crustaceans (98%) were the most importantrnitems followed by insects (0.028%) and fish (0.0045%). Mesocyclops were the mostrnnumerous genera in the diet of C. gariepinus (37%) followed by Thermocyclops (31%),rnDaphnia (14%) and Cerodaphnia (14%). Monthly variation, both in frequency ofrnoccurrence and numerical abundance, was also noted in the gut contents of G. dembecharnover the period of investigation. Diatoms contributed the highest number in 4 of the 6rnsampling months (January to April); while Cyanophyta (40%) in May and Chlorophytarn(60%) in June contributed the highest number. Monthly variation among the major foodrngroups was observed in C. gariepinus in the present study. Insects were encountered inrngreater number of stomachs in the months of January (57%), March (55.56%), April (75)rnand May (83.33) while Crustacea appeared more frequently in February (77.78%), Marchrn(55.56%) and June (77.78%). Fishes were absent entirely in April and June. All the size groups of C. gariepinus ingested all the major food items. This suggests that C.rngariepinus, at all sizes, is an indiscriminate feeder in Lake Hayq. However, the relativerncontribution of items of C. gariepinus varied with fish size. The contribution of insectsrndecreased with increasing fish size, whereas the contribution of zooplankton increasedrnwith increasing size.rnKey words: Condition factor, food and feeding habits, Lake Hayq, length-weightrnrelationship, G. dembecha, C. gariepinus