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See The Previous WAEC Fisheries Answers below
FISHERIES OBJ:
1-10: ADDBACBADA
11-20: BDACBADDAC
21-31: ADDAACCBDC

(2a)
(i)do not transport broodstock in bad water
(ii)do not rough handle brood sock
(iii)disinfect brood stock before allowing them into your hatchery, or broodstock pond
(iv)do not transport broodstock in a crowded condition

(2b)
(i)digging out pit
(ii)constructing manual barriers
(iii)disinfecting the water
(iv)getting water supply
(v)cult
(vi)trenching the pond

(2ci)
high temperature increases the hotness of water and reduces water oxygen
(2cii)
high turbidity reduces the intensity of light getting into the fish pond
(2ciii)
low dissolved oxygen causes many defects in fish which include asphyxiation, low food intake

(2d)
(i)use of hook and line
(ii)use of scoop net

(3a)
(i)Agricultural limestone
(ii)Basic slag
(iii)Laked lime
(iv) Quick lime
(v) Liquid Lime

(3bi)FISHING GEAR: Fishing gear is the equipment used by fishermen when fishing. Almost any equipment or gear used for fishing can be called fishing tackle. Some examples are hooks, lines, sinkers, floats, rods, reels, baits, lures, spears, nets, gaffs, traps, waders and tackle boxes.
(3bii)FISHING CRAFT: Fishing crafts are most essential for catching the fish in large scale in water bodies … a kind of floating raft, such as the ones used along the east coast of India

4a)
Aquaculture refers to the breeding, rearing, and harvesting of plants and animals in all types of water environments including ponds, rivers, lakes, and the ocean.

4b)
(i)The head
(ii)Scale
(iii)the fins
(iv)Literal line
(v)skin
(vi)Gills

(5a)
Cannibalism in fish is the actor practices among fishes, eating the fish or internal organs of other fishes
(5aii)
(i)by sorting
(ii)proper stocking of fishes

(5b)
(i)reducing fish losses through cannibalism;
(ii)improving supplementary feeding efficiency through adequate food ration;
(iii)increasing the accuracy of stock estimates for monitoring

(5c)
(i) ocean
(ii) river
(iii) streams
(iv) sea
(v) lake

(5di)
The latency period is the period between the exposure and i*******n of disease
(5dii)
Gravid fish are female fishes producing eggs