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results 201-220 of 229 item(s)  page 11 of 12 : ( <<  11  12  >> ) :: previous : next
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Smolts confined until 6th June, with the silver scales taken off, showing the parr bands below
201. Smolts confined until 6th June, with the silver scales taken off, showing the parr bands below
Real smolts...two years old.
202. Real smolts...two years old.
Smolts..., with the scales taken off, showing the parr bands and spots of the parr
203. Smolts..., with the scales taken off, showing the parr bands and spots of the parr
Smolt
204. Smolt
Real smolts..., with their silvery coat complete, on their way to the sea.
205. Real smolts..., with their silvery coat complete, on their way to the sea.
Parr, one year old. Parr, two years old. Smolt, two years
206. Parr, one year old. Parr, two years old. Smolt, two years
Salmon Parr.... River Dochart, September, 1906
207. Salmon Parr.... River Dochart, September, 1906
Parr....one year old. 1st April, 1903
208. Parr....one year old. 1st April, 1903
Alevins
209. Alevins
Three-month-old spat upon stones, which were gathered beneath Chequesset Inn wharf, Wellfleet
210. Three-month-old spat upon stones, which were gathered beneath Chequesset Inn wharf, Wellfleet
Figs. 1-20 illustrate the growth of the seed oysters caught on small stones. Figs. 1-10 show three-month-old
211. Figs. 1-20 illustrate the growth of the seed oysters caught on small stones. Figs. 1-10 show three-month-old oysters attached to living snails (littorina littorea). Figs. 11-14 show the oysters of the same age attached to small stones. Figs. 15-18 show oysters one and one-half years old attached to small peggles, while Figs. 19-20 show two and one-quarter-year-old oysters attached in the same fashion. Fig.16 gives a peculiar illustration of the method of attachment. The young oyster has formed an attachment to a second pebble towards its free end at some distance from the first, indicating that the mantle, even at the age of one year, retains the power of secreting a fixative.
Oyster spat, one month old, on the shells of the experimental spat collectors located in Wellfleet Bay,
212. Oyster spat, one month old, on the shells of the experimental spat collectors located in Wellfleet Bay, 1908. Various shells, such as oyster, scallop, razor clam, clam, quahaut, silver or jingle shells can be used for spat collection
Two scallops, each fourteen months old, illustrate the difference in growth between localities with good
213. Two scallops, each fourteen months old, illustrate the difference in growth between localities with good and poor circulation of water. The scallops situated in the 'current' receive more food than in the still water, and naturally have a faster growth, as is shown by the greater size of the 'current' scallop
These scallops show two or three lines which indicate temporarily arrested growth. A careful distinction
214. These scallops show two or three lines which indicate temporarily arrested growth. A careful distinction should be made between such lines and the annual growth line, which is caused by the non-growth of the scallop during the winter months, appearing about May 1
Scallops over one year old, as shown by the formation of the annual growth line, which is caused by cessation
215. Scallops over one year old, as shown by the formation of the annual growth line, which is caused by cessation of growth during the winter months. Any scallop which does not possess this annual growth line is less than one year old, and is a 'seed' scallop. The present legal definition of a 'seed' scallop is based on the annual growth line, as its absence indicates that the animal has not as yet reached its spawning season, and is, therefor, an immature animal
Graphic representation of the growth of the average scallop and its gain in volume. Starting September
216. Graphic representation of the growth of the average scallop and its gain in volume. Starting September 1 with 1 bushel of 1/2-inch scallops, the increase in volume is represented on the right in terms of bushels, corresponding to the different sized scallops on the left: (1) two-month scallop, .5 of an inch, 1 bushel; (2) three-month scallop, .91 of an inch, 7.3 bushels; (3) five-month scallop, 1.34 inches, 26.5 bushels; (4) thirteen month scallop, 1.75 inches, 62 bushels; (5) seventeen-month scallop, 2.41 inches, 185.6 bushels.... This repid increase shows the benefit of preserving the 'seed' scallop, as the yield in large scallops will more than repay the fisherman for his foresight
Scallops: Changes in form of shell. A series of drawings illustrating the changes from the early veliger
217. Scallops: Changes in form of shell. A series of drawings illustrating the changes from the early veliger (the first shell), which is 1/10 of a millimeter in size, to a 2-millimeter scallop. Note (a) change from flat-hinged veliger (1) to the prodissoconch (2), with prominent umbones; (b) return to a straight hinge (3), witdth greater than height; (c) width and height become equal (8); (d) formation of 'ears' (10)
Free-swimming stages of Sacculina carcini A, Nauplius; B, Cypris stage
218. Free-swimming stages of Sacculina carcini
A, Nauplius; B, Cypris stage
Scallops over one year old, as shown by the formation of the annual growth line, which is caused by cessation
219. Scallops over one year old, as shown by the formation of the annual growth line, which is caused by cessation of growth during the winter months. Any scallop which does not possess this annual growth line is less than one year old, and is a 'seed' scallop
Scallops: Changes in form of shell. A series of drawings illustrating the changes from the early veliger
220. Scallops: Changes in form of shell. A series of drawings illustrating the changes from the early veliger (the first shell), which is 1/10 of a millimeter in size, to a 2-millimeter scallop. Note (a) change from flat-hinged veliger (1) to the prodissoconch
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results 201-220 of 229 item(s)  page 11 of 12 : ( <<  11  12  >> ) :: previous : next
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