88 THE EDIBLE FISHES OF NEW SOUTH WALES. 
Like others of the Yellowtail family, this species deterio- 
rates very rapidly after death, if high temperatures prevail, 
and unless it is gutted. It takes the smoking process well, 
and large numbers are preserved by this means. 
The Trevally is of a beautiful silvery-white on the sides, 
and bluish above, with golden reflections towards and on the 
head. 
Blue Trevally (Caranx hippos). 
This is a large fish, attaining apparently a length of 
about 3 feet. Very little evidence in regard to the occurrence 
of this fine species in our waters has been forthcoming so far, 
and it is looked upon as being scarce; but as I have pointed 
out in the case of others among our food-fishes, of a more or 
less pelagic or oceanic nature, there has been so little outside 
work carried out, that we are not justified in accepting present 
information as conclusive—indeed, far from it. Future in- 
vestigation will, very probably, I think, reveal the presence 
of the Blue Trevally in our northern waters, at least, in 
considerable numbers. 
This is the “ Cavalla”’ or “ Jack” of the United States, 
where, according to Jordan and Evermann, it is the most 
abundant, and one of the most valuable of the genus. 
Noble Trevally (Caranx nobilis). 
I have not met with this Trevally, which was described 
by Sir Wiliam Macleay in 1881. The description was founded 
on a specimen, captured in Port Jackson, which measured 
24 inches. 
Silvery Moon-Fish (Caranx yallus). 
Puate LVIII. 
This species, which is well known as a food-fish in certain 
tropical parts, has only recently been recorded by me from 
New South Wales waters, the example upon which the record 
was based having been captured at Evans River (in salt 
water), on the northern portion of our coast. This example 
measured about 18 inches, but the species is known to reach 
a length of not less than 3 feet. 
