. Bericht für ... auf der Lancashire Sea-Fisheries Labor an der Universität von Liverpool und der Sea-Fish Brutplatz an Piel. nd 23 cm in der Länge und in der Hälfte aller thosereported waren zwischen 21 und 25 cm in der Länge. Man muss sich erinnern, dass die Position der Rückeroberung reportedis immer ungefähren, für den Skipper nicht sagen, zu einer Meile ortwo, genau, wo er ist, und auch die Fische kann beencaught überall auf einem zehn bis zwanzig Kilometer ziehen haben. Wir haben noreason irreführende Informationen zu vermuten, die placesof erlangen: auf der anderen Seite die Kapitäne waren immer mostwilling Details zu geben,

• Bildanbieter: The Reading Room / Alamy Stock Foto
• Bild-ID: 2AG3159
• Dateigröße: 7,1 MB (454,9 KB Komprimierter Download)
• Freigaben (Releases): Model - nein | Eigentum - nein
• Format: 1280 x 1952 px | 21,7 x 33,1 cm | 8,5 x 13 inches | 150dpi

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. Report for ... on the Lancashire Sea-Fisheries Laboratory at the University of Liverpool, and the Sea-Fish Hatchery at Piel. nd 23 cms. in length and half of all thosereported were between 21 and 25 cms. in length. One must remember that the position of recapture reportedis always approximate, for the skipper cannot tell, to a mile ortwo, exactly where he is, and also the fish may have beencaught anywhere on a ten to twenty-mile drag. We have noreason to suspect any misleading information as to the placesof recapture : on the other hand skippers were always mostwilling to give full details, and very often eager to know wherethe fish had been marked. We assume, generally, that theplaice moved straight from where they were set free to wherethey were caught, but this must hardly ever be the case :the fish, doubtless, backs and fills in its movements. Forsmall periods of a month, however, it is quite permissible toassume that the migrations path is directly from the one spotto the other.The J u n e - J u 1 y Migrations. The data from which these are to be deduced are givenin the following synoptic chart:— 114. Fig. 8. Recaptures of marked plaice reported for June and Julj. 115 The following explanation will serve for this, and theother charts illustrating the migrations. Each recapture isindicated by a black dot, and the number underneath the lattergives the length of the fish, as recaptured, in centimetres.The area where the fish were liberated is outlined by a brokenline enclosing the words area of liberation. An irregularly-curved contour line, marked June and July, is drawn roundthe places of recaptures in these two months so that we mayunderstand that the fish liberated have spread out, in alldirections, from the area of liberation to the area enclosedby the June-July boundary line. During June and July, plaice previously inhabiting the shallow-water regionimmediately offshore are migrating out to the West, North-west, and South-west from shallower into deeper wa

Stockbilder mithilfe von Tags suchen

• bookcentury1800
• bookdecade1890
• booksubjectfisheries
• bookyear18