NATURAL HISTORY, TORONTO REGION 
sometimes until they have attained a length of eight 
inches. 
GANOIDEI. (Ganoid Fishes.) 
ACIPENSERIDAE. 
2. Lake Sturgeon. Rock Sturgeon. Acipenser 
rubicundus (Lesueur).—The fishermen make a dis- 
tinction between the young and the old of this species, 
calling the former Rock Sturgeon and the older fish 
Lake Sturgeon. There is, however, but one Stur- 
geon in our waters; the difference in the size and 
shape of the snout and in the number and development 
of the spines between the immature fish and the adult 
is sometimes very great, hence the idea that two 
species are found. The Lake Sturgeon is found in 
Lake Ontario, but rarely near Toronto. It is a food 
fish of considerable commercial importance, its flesh 
being used either fresh or dried and smoked. From 
its roe the delicacy known as caviare is made. This 
fish attains a large size, specimens six feet in length 
and weighing one hundred pounds or more being not 
uncommon. The spawning season extends from the 
end of May to the beginning of July, during which 
period the fish run from the lakes up the rivers for 
a considerable distance for the purpose of depositing 
their ova. 
Amupan. (The Bowfins.) 
83. Dogfish. Bowfin. Mudfish. Amia  calva 
(Linn.).—This fish is found in the weedy waters of 
250 
