Translation Series No.1211

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Opcytenzet Numbep 20 I0 - 66 - formation of mature ova. The strong growth of the female sexual products through increase in the amount of cell content and through yolk deposition and water uptake takes place after the diplonema stage of chromosome cor›- jugation and before meiosis. Since this process can also be observed during . the periodic - attainment of -spawning maturation in the second period of life, it can be assumed that in the sexual cycle of adult fish maturation begins with the enlargement of the oocytes. . The stock of salmon in the Baltic Sea is composed almost exclus- ively of such fish that are in the first period of life and have nôt yet spawned. The fish of the age class A.1+ have atill almost one or two years of sojourn in the sea ahead of them and must be designated as juveniles in the customary sense. In the following it will be - examined whether the ovaries undergo a change in the sea, and whether it is posàble to ascertain the probable time of spawning already at this stage. 3.2.1. The ovary of oocytes , , . . , , , f 1 ■ , ..• . I ■ . I .. • —■ ttesch.u. Cen %re diees End discs . , Fig. 15. Size of egg in different regions of the ovary . (means of 12 salmon, 74 to 79 cm total length). • The ovary conditions were investigated in 68 females that were ) . from 43 to 104 cm long. Three fish were in the first year of their star in the Baltic Sea, 31 fdsh were in their second year and 34 fish were in ».11 20 mm Egg- diameter • Enturchmesser
• their third year. , Recruitment oocytes - 'maturing eggs Fig. 16. Cross-section through a salmon ovary, age class A.2+ (X 20). EMurchmesser = egg diameter mr. Number Of maturing oocytes Anzahl redender Oocy ten o mittlerer Oocytendurclynesser Mean diameter of • oocytes w 10 30 0 IllAnyohl rellender Oocyten Number of aturing oocytes „ .. . . . . Ovary discs Fig. 17. Mean diameter of occytes and number of oocytes in different ovary regions. 200 Ovorscheiben - 67 -
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FISHERIES RESEARCH BOARD OF CANADA
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sos-2cto—lo-31 DEPARTMENTOFTHESEC
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• 6.1. Previous investigations 17
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-5-. and Kerr very much later menti
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treated as a quality, a special pop
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• -9-- per cent). Furthermore, th
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• - 11 - fishery, mentions the gr
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• - 13 - in LiepUva. These voyage
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• 1948/49 545 1949/50 730 1950/51
Page 19 and 20: • 2.2.1. River fishing - 16- The
Page 21 and 22: - 18- are 50 norsels, 60 to 80 cm l
Page 23 and 24: • nets give better results is onl
Page 25 and 26: • • G Fig. 4. End buoy for salm
Page 27 and 28: • with • Total length (cm) Mout
Page 29 and 30: • • - 25- of Bothnia. In the fa
Page 31 and 32: • • - 27- increase the catch. S
Page 33 and 34: • of • fishing representsavalue
Page 35 and 36: • to lower figures than in the fa
Page 37 and 38: • • Umfang = Cire umference - 3
Page 39 and 40: • - 35 - and nape corresponds to
Page 41 and 42: • • / 100 50 Selektion Selectio
Page 43 and 44: - 39 - In Table 9 have been calcula
Page 45 and 46: . Table 10. Number of salmon per 10
Page 47 and 48: • Table 11. Number of salmon per.
Page 49 and 50: • - 45 - cza-ci, es When consider
Page 51 and 52: - 47 - If We examine once more the
Page 53 and 54: - 49 - German fishermen work during
Page 55 and 56: • - 51 - is true, have to be corr
Page 57 and 58: Table 16. Seasonal yields of the fi
Page 59 and 60: Table 17. Monthly average weights o
Page 61 and 62: - 57 - In February and March hardly
Page 63 and 64: • Table 20. Additional catch of c
Page 65 and 66: • 100 50 60 100 cm Totallarle . 2
Page 67 and 68: • subject to an error of ± o.op9
Page 69: cycle) during the second . period o
Page 73 and 74: 50 r-■ 2 / bet; 56cm = 1 fis 1 li
Page 75 and 76: • - 71 - ovary that has already b
Page 77 and 78: 5 - 73 - April 1960 the diameter of
Page 79 and 80: - 75 - oocytes can be demonstrated
Page 81 and 82: . ineftlerer Mean OocytendurcArness
Page 83 and 84: - 79 - furnish the energy fer the s
Page 85 and 86: ' 1741 salmon, which were.caught be
Page 87 and 88: • - 83- the series of measurement
Page 89 and 90: - 85 - the relative amount of eggs
Page 91 and 92: - 87 - The calculation of a formula
Page 93 and 94: - 89 - area of distribution is form
Page 95 and 96: - 91 - as percentages of thé recov
Page 97 and 98: Table 22. The recapture of tagged s
Page 99 and 100: • II> Three conclusions can be dr
Page 101 and 102: • 6 65- 64 - 62-. 61 - 6 . 5 . 59
Page 103 and 104: • - 99 - fish. The tagging does n
Page 105 and 106: - 101 - tagging experiments'that sa
Page 107 and 108: - 103- Renne Bank in about 60 m dep
Page 109 and 110: • 9:1 0 a) el-4 o (XI -P CNI 4- o
Page 111 and 112: 14,3 14,3 30,7 31,3 27,7 6,0 15,0 1
Page 113 and 114: Table 26. Catches of salmon in the
Page 115 and 116: - 111 - between Hela and Kahlberg r
Page 117 and 118: • - 113- 5 .. Age and growth of t
Page 119 and 120: cm 100 80 60 40 - 1 15- customarily
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found can be used for the recalcula
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v 0 00 0 I I - 119- of the scales.
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- 121 - The interpretation of the y
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• - 1 23 - the age groups 2.B to
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• L s - L c r s 0.85 Smolt Ls = l
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5.3. The'age composition of the Ger
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-129- with shares in the catch of o
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"ervoct. Yeer-Le- -e-t. '4.y-c.1*.e
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1955 1 2 3 4 23 3 61 506 7 3 135 21
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- 135 - yeAy-ctt4 thé explanation
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• • _ Table 33. The composition
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Table 34. Composition by age of cat
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- 141 - yeAy-cle..es Table 35. The
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- 143 - • U7,) tdL comparablenece
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• whereas the present data .(1957
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Sin% 0,1 2,8 37,0 96,8 100,0 - 147-
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• - 149 - these results 38 per ce
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• • Number of salmon J. en1967
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4. number 50 e" • ); e e , lot nb
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they take account of the annual cha
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• -157- and in the stock are bein
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Table 43. Mean lengths of age group
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• - 161 - of these catches has be
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- 163 - of enolt in Fig. 36. From a
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--165 - increase'in weight is more
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• rl -P b..0 -e nzi -ri r-1 gl a)
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- 169 - CLA‘s set of smolt of 193
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Year's sets of smolt CILS present 7
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- 173 - necessary to follow the gro
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- 175 - • been ascertained from t
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(after K. A. Pyefinch 1955). — 17
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• gadids and sticklebacks (after
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- 181 - especially decisive in, the
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6.3.1. Seasonal fluctuations 36,9 2
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• Number of Months Gear salmon in
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MagerdW hing 40 , 20 Filling of Sto
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Deep could be examined. - 188 - Chr
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- 190 - salmon . switch over to the
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• - 192 - recognizable after seve
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- 194 - amount of food. Under-consi
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- 196- expenditure, composition in
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• - 1 98- the stock losses are co
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NUmber of salmon per Z Weigh- Seaso
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• 'Table 55. Values of the total
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- 204 experiment were about 40 per
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- 206- strength of the stock N pert
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• N„ Z o = cf„ (M1- T) -- In
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— 210— the coefficient for the
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- 212- In a further paper Piggins (
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- 214- shifted and the fOod supply
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- 216 - concerns the yield of captu
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nachafter 00 04 0,3 0,4 2 1 0,5 6 9
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• 1. (5 100 000) (4 250 000) 4 25
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• •em.ilts - 222 - in an error
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• - 224- BRANDT, A. y. , 1959: Fa
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- 226 - Paw, T. H., 1938: Fluctuati
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- 228- PETERSEN, C. G. .11, and Orr
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Table I. Captures per unit effort w
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Table II. Captures per unit effort
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• Yea.r Sweden Continuation Table
Page 241 and 242:
Table VI. Ratio between fork le . B
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