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Fishery Bulletin of the Fish and Wildlife Service V.53

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Fishery Bulletin of the Fish and Wildlife Service V.53 FISHES OF THE GULF OF MAINE 151 Eel Anguilla rostrata (LeSueur) 1817 sur~ace p~ler brown and yellower, with dirty yel­ lOWIsh-whIte belly. It is commoa knowledge AMERICAN EEL; SILVER EEL; FRESH-WATER EEL·, that eels are dark if living on dark mud but much ELVER (YOUNG) paler on pale sand. And Parker 63 has found that 1~ Jordan and Evermann 1896-1900, p. 348, A. chrysypa they can change from pale to dark in about Rafinesque 1817. hours and from dark to pale in a little more than 3 hours, if moved from a white background to a. Description.-In the common American eel the black or vice versa, under a strong light.. do:sal fin originates far behind the pectorals, Size.-Eels are said to grow to 4 feet in length thIS character is enough to distinguish it from the and to 16~ pounds in weight. Full-grown females conger, from which it also differs in that the lower .average only about 2 to 3~ feet, however, and ~a,: projects beyond the upper or at least equals males are smaller. Any eel more than 18 inches It m length, and its eyes are small and round. long would probably be So female and one more Furthermore, it develops scales as it grows, though than 24 inches in length would c~rtainly be one. these are so small that they might be overlooked. The smallest mature males are about 11 to 12 The eel, however, has a pointed snout, like the inches long, females about 18 inches. conger, a large mouth gaping back as far as the Habits.-The life history of the eel remained a. middle of the eye or past it; and its gill slits are mystery until very recently. It has been com­ set vertically on the sides of the neck, their upper mon kn~wledge for centuries that young elvers corners abreast of the center of the base of the :un up mto fresh water in spring, and adults pectoral fin. It.is very closely related to the Journey downstream in autumn. A host of myths European eel (Anguilla vulgaris), but has fewer grew up to explain the utter absence of ripe eels vertebrae (average about 107 as compared with of either sex, either in fresh water or along the about 114 or 115 in the European species). seacoast.. But it was only a few years ago that Oolor.-The colors of eels vary widely with the the breedmg places of the European and American bottom on which they live. As So rule they are eels were discovered and the history of their larvae dark muddy brown or olive-brown above, more or less tinged with yellow on the sides; the lower u lour. ot Exper, Zoo!., vol. gs, 1945, No, 3. pp. 211-234. .,~\11~~~~I_'i'_~t· C E F'XGURE 69.-Eel (Anyuillarostrata). A, adult Connecticut River Massachusetts' f G d d· . b H L T dd' B "L hal" ' , , rom 00 e, rawmg v . o , , e?tocep us stage, .49 mm.; C, "Leptocephalus" stage, 55 mm.· D "Leptocephalus" stage '58 mm·· E, transformatIOn stage, 61 mm. B-E, at:ter Schmidt. ', ,', 152 FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE traced, chiefly by the persevering researches of of a small dip net and 545 with a few grabs of the Danish scientist, Johannes Schmidt.64 Now his bare hand. Elvers in equal multitudes have we know that the life history of the eel is just the often been described in other streams, American antithesis of that of the salmon, shad, and alewife, as well as European. Eels can live out of water for eels breed far out at sea, but make their growth so long as to give rise to the story that they often either in estuarine situations or in fresh water. travel overland. There is no positive evidence The young elvers, averaging from 2 to 3 ~ inches for this. But Sella 66 has proved, by experiments in length, appear along our shores in spring. As with European eels marked so as to be recognizable yet we have few data on the exact date of their if recaught, that they can carry out journeys as arrival on the Gulf of Maine coast. They appear long as 31 miles (50 kilometers) along underground as early as March at Woods Hole; by mid- or waterways. Doubtless it is this ability that late April both in Narragansett Bay and in Passa­ explains the presence of eels in certain ponds that maquoddy Bay at the mouth of the Bay of Fundy, have no visible outlet nor inlet, a fact often while Welsh encountered a tremendous run in attested. Little River, near Gloucester, on May 5, 1913, It is true in a general way that eels seek muddy suggesting that they may be expected in the bottom and still water, as has been said so com­ mouths of most Gulf of Maine streams during monly. But this is not always so whether in salt that month. And they are found ascending water or in fresh. Thus the rocky pool at the streams in the Bay of Fundy region during the outer end of the outlet from Little Harbor, summer. A run may last for a month or more in Cohasset, on the south shore of Massachusetts one stream, only for a few days in another. And Bay, is a good place to catch eels; and large ones there is a noticeable segregation even at this early are only too common in swiftflowing, sandy trout stage, some of the elvers remaining in tidal streams on Cape Cod; we have had one follow and marshes, in harbors, in bays back of barrier nibble at the trout we were dragging behind us beaches, and in other similar situations, some even on a line. The fact ls, they can live and thrive along the open coast, especially where there are wherever food is to be had, which applies to them beds of eel grass (Zostera); while others go into in estuarine situations and in fresh water. fresh water, some of them ascending the larger No animal food, living or dead is refused, and rivers for tremendous distances.65 the diet of the eels in any locality depends less on It is now generally believed that most of the choice than on what is available. Small fish of eels that are caught in fresh water are females. many varieties, shrimps, crabs, lobsters, and But some of the females remain in salt marshes smaller crustacea, together with refuse of any and harbors, to judge from the large size of many kind (for they are scavengers) make up the bulk of the eels that are caught there. And nothing is of the diet in salt, estuarine, and brackish wate1.'. known as to what preference the males of the Being very greedy, any bait will do to catch an American eel may show in this respect. eel. They are chiefly nocturnal in habit, as every It is no wonder that the ability of the elvers to fisherman knows, usually lying buried in the mud surmount obstacles as they run upstream is by day to venture abroad by night. But eels, proverbial, for they clamber over falls, dams, and large and small, are so often seen swimming about, other obstructions, even working their way up and so often bite by day that this cannot be laid over damp rocks as Welsh saw them doing in down as a general rule. Little River, where they were so plentiful on May Eels tolerate a wide range of temperature. But 5 and 7, 1913, that he caught 1,500 in one scoop it is common knowledge that those inhabiting the salt marshes and estuaries of our Gulf, and its II The lite history of the eel Is presented In more detail than Is possible here tributary streams, mostly lie inactive in the mud by Schmidt (Phllos. Trans. Roy. Soc. London, Series B, vol. 211 (1922) during the winter. 1923, pp. 179-208, summarized In Nature, vol. 110, 1922, p. 716), and by Cun­ 67 ningham (Nature, vol. 113, 1924, p. 199). See also Schmidt (Rapp. et Proc.­ Eels grow slowly. Hildebrand and Schroeder Verb. Cons. Perm. Internat. Explor. Mer, vol. 5, No.4, 1906, pp. 137-204. concluded from a series of measurements taken at pIs. 7-13); for a popular account see Smith (Nat. Oeog. Mag., vol. 24, No. 10, October 1913, p. 1140). differentseasonsinlower ChesapeakeBaythatthose " Eels are native In Lake Ontario which they reach by way of the St. Lawrence River; and up the Mississippi drainage systems even as far as "Mem. R. Comlt. Talassogr. Ital., vol. 168, 1929. North Dakota, Wisconsin, Ohio, and western Pennsylvania. " Bull. U. B. Bur. Fish., vol. 43,1928, p.114. FISHES OF THE GULF OF MAINE 153 2}2 inches long in April are about 5 inches long a known to run upstream again. Smith suggests· year later, or about 2 years after their transforma­ that they probably "jellify" and disintegrate, tion. The winter rings on the scales have shown as the conger does. that full grown adults of the European species are Eels (European) are among the most prolific from 5 to 20 years old, depending on food supply, fish, ordinary females averaging 5 to 10 million and other conditions j this is corroborated for the eggs and the largest ones certainly 15 to 20 American species by the fact that Dr. Hugh M. million. It is doubtful whether eggs laid by the Smith, former Commissioner of the United States American eel have been seen, or of the European Bureau of Fisheries, found that a female, on the either, for that matter.60 But it is generally way down the Potomac, was in her twelfth year.
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