. Rapport pour ... sur le Sea-Fisheries Lancashire Laboratory de l'Université de Liverpool, et le Sea-Fish au couvoir Piel. nd 23 cms. de longueur et la moitié de tous les thosereported ont entre 21 et 25 cms. de longueur. Il faut se rappeler que la position de récupération toujours reportedis approximatifs, pour le patron ne peut pas dire, à un mile ortwo, exactement où il est, et aussi le poisson peut avoir n'importe où sur un beencaught dix à vingt milles, faites glisser. Nous avons noreason de soupçonner toute information trompeuse quant à l'placesof : récupération d'un autre côté skippers étaient toujours mostwilling pour donner plein de détails,

• Contributeur: The Reading Room / Alamy Banque D'Images
• ID de l’image: 2AG3159
• Taille du fichier: 7,1 MB (454,9 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 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

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• bookcentury1800
• bookdecade1890
• bookubjectfisheries
• bookyear18