. American fish-cultura [microformati] : abbracciando tutti i dettagli di riproduzione artificiale e allevamento di trote, la cultura del salmone, shad e di altri pesci. Cultura di pesce; Pesci; Oyster-cultura; piscicoltura; Poissons; Ostréiculture. 190 AMERICAN PISH CULTURA.. femmine, ma questi sono ancora molto pochi fino al XV di Octo- ber. Subito dopo questa data iniziano a salire i Rapids per deporre le uova. Spesso non è tuttavia che alcuni di essi siano ma- ture e iniziare la deposizione delle uova fino alla 20th. Essi vengono quindi in numeri eonsiderable, e presto finire la deposizione delle uova. Molto pochi sono trovati nel ruscello in ritardo come Novembe

• Collaboratore: The Book Worm / Alamy Foto Stock
• ID dell’immagine: REPJM5
• Dimensioni dei file: 7,2 MB (243,7 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 938 x 2665 px | 7,9 x 22,6 cm | 3,1 x 8,9 inches | 300dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. American fish-culture [microform] : embracing all the details of artificial breeding and rearing of trout, the culture of salmon, shad and other fishes. Fish culture; Fishes; Oyster-culture; Pisciculture; Poissons; Ostréiculture. 190 AMERICAN PISH CULTURE.. females, but these are still very few until the 15th of Octo- ber. Soon after this date they begin to ascend the rapids to spawn. It is not often, however, that any of them are ma- ture and commence spawning until the 20th. They come then in eonsiderable numbers, and soon finish spawning. Very few are found in the brook as late as November 14th, although probably they sometimes spawn later. Crooked river is a larger stream, and they report different habits in some respects. The very first that come into the stream are males, but after that the females seem to head the ad- vance, and the males follow them; taking the whole of September, the males are not more numerous than the other sex. In the whole season there are more males. They sometimes continue to spawn very late. The state of the water has a great influence on their motions at this time. A rise i followed by a plentiful run of fish. " Their beds are made in the gravel where the current is rapid, but just on the verge of a ripple in the water; rarely seen on the lower side of a ripple. They make large excavations, the sand and gravel from which are carried out by the current, and form a mound below. These excavations are sometimes three feet in diameter and are made by more than one pair. A large number of both sexes are sometimes seen together in one hole. No fighting is observed amongst the males. It is more com- mon, however, to see a single pair working together, lying side by side in the nest. They make the excavations by fanning with the tail, no digging with the head being ob- served. On favorite grounds the nests encroach on each other. Please note that these images are extracted from scanned page images that may have been digitally enhance

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1860
• booksubjectfishes
• bookyear1868