XLII.—<i>Early stages in the development of the food-fishes</i>

Prince, Edward E.

doi:10.1080/00222938609460171

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“…lis, \i\>. 21, 40) refpcctinj; the various shajies ajssumed by the scutum at different stjiges, do not seem to be borne out by study of Gadoid and other forms ; and the opinion formerly expressed by one of us(No. 123), that the shield shows differences in outline, characteristic of different species, also nccils modification.…”

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On the development and life-histories of the Teleostean food and other fishes

McIntosh¹,

Prince²

1890

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appearance of finely crossed fibres, partly due in all probability to the breaking up of the tissue.Blennius pholis.-In May a large male, 6f inches long, was procured at the East Rocks, St Andrews. The testes were highly developed, and almost reptilian or aniphiliian in appearance.They form two large flattened organs, or rather are rounded anteriorly, and flattened on the inner side-the two Ijodies, in foct, being precisely like the two separated halves of a long bean. The blood-vessels run along the flat surface, and give off branches which spring as it were from a midrib. In colour they are of a faint pinkish white.The outer or convex region is of a firmer texture and more translucent than other parts of the testis, being composed apparently of tubules containing spermatozoa in full activity and abundant sperm-cells. The whiter opaque region consists of aggregated sperm-sacs.The spermatic duct leading to the genital aperture is exceedingly wide, and on one side shows a spermathecal enlargement, which, at first sight, resembles an additional urinary bladder.The ducts open by an aperture on a prominent papilla behind the large corrugated anal orifice. This strong papilliform protuberance approaches that in fishes which are known to copulate, but there is no account of such in this species. A little later (viz., on the 23rd June) an adult female, 5 inches long, had the ovaries much enlarged-containing a mass of large bluish-grey ova, and smaller ones of a slightly orange hue. The minute structure of these somewhat peculiar ova has been carefully described by Dr Scharff.* The ova (which were not quite mature) measured about "0415 of an inch in diameter.The above facts show that this species deposits its eggs apparently during the early summer ; Parnell, indeed, names the month of June, while Dunn considers that it spawns in spring. Couch states that it deposits the ova on the roof of small caverns in rocks near shore {ZooL, 1846, p. 1419) ; and Day, who quotes the above authors, adds tliat he found minute fry at Penzance in August. At St Andrews young specimens, about an inch long, and which had acquired the features of the adult, are abundant in the pools of the East Rocks about the middle of September. Bhnniops ascanii. -On 14th June 1886 a fine male, procured in a crab-pot ofi' thi' Buddo Rock, Fife, showed testes only partially developed. Tlie stomach was distended by eggs of Cyclopteitis, upon which it had Ijeen feeding largely.A female in August exhibited only traces of ova-the ovaries being apparently atrophied, but on tlie 16th September both organs were very large, the individual ova reaching about j\ inch in diameter.Motella mustela. -On 17th July 1885, a female rockling, 6 inches long, was examined, and the ovaries were found to be connate posteriorly, and contained ova of some size, so that the species must pair very early in winter, and the spawning period would seem to be very lengthened. In i\Iay the tanks in the Laboratory were found to be full of the floating ova of this species, and during March, ...

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confidence: 87%

On the development and life-histories of the Teleostean food and other fishes

McIntosh¹,

Prince²

1890

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“…v. Kowalewski für die von ihm untersuchten ellipsoidischen Eier versucht hat. Auch Prince (70) erklärt sich auf Grund von Untersuchungen lebender Eier dafür, dass das Kopfende in loco bleibt', das hintere Ende mit dem Aus dieser Feststellung können wir wohl schliessen, was Schwarz nicht ausgesprochen hat, dass von dem Auftreten der Schwanzknospe an eine Bildung des Embryos durch Konkrescenz der Keimscheibenränder unmöglich ist.…”

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Untersuchungen über Gastrulation and Embryobildung bei den Chordaten, von Fr. Kopsch. I. Die morphologische Bedeutung des Keimhautrandes und die Embryobildung bei der Forelle. Mit 10 lithographischen Tafeln und 18 Abbildungen im Text.

Kopsch¹

1904

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XIX.—On the Development and Life-Histories of the Teleostean Food- and other Fishes

M'Intosh¹,

Prince²

1890

Trans. R. Soc. Edinb.

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Until very recently existing information concerning the eggs and oviposition of British fishes, and more especially marine fishes, was of the most fragmentary character. In the standard works upon Ichthyology, such as Owen's Anatomy of Vertebrates (vol. i. Fishes), it is comprised in a few vague sentences; while the original papers published by British ichthyologists are not numerous, and refer, for the most part, to fresh-water species. Within the last few years, however, attention has been more systematically directed to the subject, and the enlightened views of the late Royal Commission on Trawling, and more especially of its chairman, the late Earl of Dalhousie, has given a fresh impetus to the study of the development and life-history of our food-fishes, as preliminary to a thorough investigation of their habits, food, so-called migrations, and general life-history.

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XLII.—Early stages in the development of the food-fishes

Cited by 3 publications

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On the development and life-histories of the Teleostean food and other fishes

On the development and life-histories of the Teleostean food and other fishes

Untersuchungen über Gastrulation and Embryobildung bei den Chordaten, von Fr. Kopsch. I. Die morphologische Bedeutung des Keimhautrandes und die Embryobildung bei der Forelle. Mit 10 lithographischen Tafeln und 18 Abbildungen im Text.

XIX.—On the Development and Life-Histories of the Teleostean Food- and other Fishes

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