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3 Transatlantic Movement of Atlantic Bluefin Tuna
Pages 39-78

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From page 39... ... Atlantic bluffers tuna were marked and released in the western Atlantic Ocean from 1954 in varying numbers until 1987 (Parrack, 1990~. The total number tagged by the National Marine Fisheries Service (NMFS) Read the entire page →
From page 40... ... These results indicate that giant bluefin tuna can travel long distances; only one of the remaining 91 giant tuna or medium fish tagged in Be western Atlantic Ocean was recovered in the eastern Atlantic Ocean. This fish was tagged near Bermuda and recovered 10 years later. Read the entire page →
From page 41... ... Maker concluded that the west to east transatlantic movement of small fish might be due to unusual stimuli and that the great majority of Atlantic bluefin tuna remain on one side of the Atlantic Ocean or the other. Alternatively, the "nonrandom" movement of small bluefin tuna from the Mid-Atlantic Bight to the Bay of Biscay may reflect the importance of both nursery areas for small bluefin tuna. Read the entire page →
From page 42... ... Reanalysis of Tagging Data Tagging data suggest that physical movement or mixing of Atlantic bluefin tuna in fishing grounds from opposite sides of the Atlantic Ocean is significant. Thus, the committee reanalyzed the tagging data to estimate rates of transatlantic movement between fishing grounds. Read the entire page →
From page 43... ... and (2) do not admit roundtrip movement, any such return movement would cause the transfer rates estimated by Equation (3) Read the entire page →
From page 45... ... The western data from Table 3-10 were used to estimate shedding rates (Table 3-11~. Comparison of SS to DD (Db Db vs. Read the entire page →
From page 46... ... Tag 0 1 2 3 4 5 6 7 8 9 1954193 1955232 195699 195739 195838 1959147 1960237 1961188 1962128 1963223 1964553 19651,812 19664, 128 1967718 1968521 1969567 1970729 1971432 1972284 1973393 19741,752 1975349 19762,460 19772,115 19781,680 19791, 124 19803,074 19811,797 1982210 1983149 198486 1985130 198651 198766 198896 19891 13 1990127 1 - - - - 2 1 1 22 14 113 10032 16463 524577 9860 8819 1481 52119 1159 1056 4022 75126 2227 18563 52193 24110 630 141100 572 11 12 12 -1 2 1 36 51 16 9 12 9 12 6 7 51 6 75 81 34 11 6 2 1 4 2 7 2 2 14 2 8 2 l 4 2 3 8 13 6 2 - 1 1 3 7 7 3 1 2 1 1 2 1 1 1 2 2 l 2 Note: Dash indicates zero value. Read the entire page →
From page 47... ... TRANSATLANTIC MOVEMENT OF ATIAlITIC BLUEFIlI TUNA lrDl S 47 8 9 10 1 1 12 13 14 15 16 17 1 8 Total 1 1 2 1 2 1 1 1 1 1 1 1 1 1 2 2 ., 1 9 15 132 267 1,172 188 116 114 190 83 74 71 278 58 333 341 192 53 268 68 s 12 3 3 2 2 2 Read the entire page →
From page 48... ... Tag returns are by year tagged and years out for fish tagged with a single tag. YearTag 0 1 2 3 4 5 6 7 8 1954192 1 - - - - 2 - - 1955231 - - - - - - - - 195699 - - - - - - - - 1 95739 - - 1 - - - - - 195838 - - - 1 9591 47 1 - - - - - - - 1960237 - - 3 1 - - - - 1 1961185 2 2 3 2 - - - - 1962128 1 4 1963183 7 3 1 1964 54410032 - - - - - - 1965 1,75116463 36 3 - - - - 1966 4, 1 14523575 51 8 6 - 2 1967 7189860 16 13 1968 4486012 6 - - - - - 1969 5471477 12 1 2 - 1 1 1 970 7245 11 1 9 9 7 2 1971 1 1521 1 3 - - 1 1972 130314 6 1 - - - - 1973 10548 1 1 - - - - 1974 4661743 14 7 4 1975 2392016 4 - - - 1 - 1976 1,91614552 66 5 - 1 1977 1,59039129 50 1 - - - 1 1978 8482036 13 4 4 1 1 1979 1,110529 10 1 3 1 1 1980 3,066141100 6 3 4 2 2 2 4 1981 1,787552 2 1 1 1 1 - 2 1982 20011 1 2 - - - - 1983 14611 4 4 - - 1 1984 84-2 - - ~ 1985 128-1 2 - - 1986 51-1 1 - - 1987 6611 - - - - - - 1988 96-2 - - - - - - 1989 1 12 -- - - - - 1990 127 -- - - - - - 1 4 Note: Dash indicates zero value. Read the entire page →
From page 49... ... TRANSATLANTIC MOVEMENT OF ATIANTIC BLUEFIN TUNA U.S. fir 49 8 9 10 11 12 13 14 15 16 17 18 Total 1 1 1 1 1 1 1 4 2 9 5 10 132 267 - 1,169 188 78 109 188 17 21 14 87 41 269 224 80 50 268 65 5 11 2 3 2 2 2 Read the entire page →
From page 50... ... Tag returns are by year tagged and years out for fish tagged with two or more tags. Year Tag 0 1 2 3 ~ X 1954 1955 1961 1963 1964 1965 1966 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1989 Note: Dash indicates zero value. Read the entire page →
From page 51... ... TRANSATLANTIC MOVEMENT OF ATlANTIC BLUEFIN TUNA U.S. or 51 8 9 10 11 12 13 14 15 16 17 18 Total 1 2 S3 38 2 66 53 57 191 17 64 117 112 3 3 1 1 Read the entire page →
From page 52... ... l 52 Can Cat .s o o o 4 o o . Read the entire page →
From page 53... ... 53 .s o o to o 4 o Cal o Cal � is: 4 C~ 3 .s Cal . Read the entire page →
From page 54... ... Tag returns are by year tagged and years out for single tags, double tags recovered with two tags, and double tags recovered with single tags. SINGLE TAGGED - SINGLE RECOVERY Recoveries by Year Year Tagged 1971 115 1972 130 1973 105 1974 466 1975 239 1976 1,916 1977 1,590 1978 848 Total 5,409 0 1 2 3 4 2 11 3 14 4 8 17 43 20 16 145 52 39 129 20 36 250 309 14 4 66 50 13 154 DOUBLE TAGGED - DOUBLE RECOVERY Recoveries by Year 7 4 19 5 6 1 4 - 1 1 4 1 1 8 3 2 4 5 6 3 2 8 3 2 YearTagged 0 1 2 3 4 5 6 1971317 1972154 1973288 19741,286 1975110 1976544 1977525 1978832 Total4,056 6 29 52 1 36 12 4 148 30 27 7 57 5 8 56 61 251 2 19 2 3 23 9 64 DOUBLE TAGGED - SINGLE RECOVERY Recoveries by Year 1 6 1 YearTagged 0 1 2 3 4 5 6 1971317 1972154 1973288 19741,286 1975110 1976544 1977525 1978832 Total4,056 7 1 2 1 7 6 1 4 1 21 18 15 7 26 6 3 13 13 101 4 2 4 18 6 8 12 54 2 12 2 5 2 1 Note: Dash indicates zero value. Read the entire page →
From page 55... ... TRANSATLANTIC MOVEMENT OF ATlAlITIC BLUEFIN TUNA U.S. air dgS, 55 7 8 9 10 11 12 13 14 15 Total 1 1 1 - - 1 17 21 14 87 41 269 224 80 2 1 2 1 - - - 753 7 8 9 10 11 12 13 14 15 Total 1 1 2 1 43 34 38 133 49 92 77 474 7 8 9 10 11 12 13 14 15 Total 1 2 2 23 19 19 58 9 15 25 35 203 Read the entire page →
From page 56... ... Tag returns are by year tagged and quarters out for fish tagged with a single tag, tagged with two tags and recovered with two tags, and tagged win two tags and returned with one tag. SINGLE TAGGED - SINGLE RECOVERY Year Tagged QR 1971 1972 1973 1974 1975 1976 1977 1978 TOTAL 2 2 4 15 1 3 1 5 10 11 5 15138 35 17 4 55 4 2 15 26 2 1 1 2 10 11 13 37 8 49 32 65 3 7 1 - 1 8 4 3 45 2 2 - 5 - 53 3 53 3 3 228 22 12 110 170 12 13 65 671 6 s 12 - - 1 4 -3- -8 13+ 1 1 - 9 126 1131 Totals 17 21 14 87 41269224 80753 DOUBLE TAGGED - DOUBLE RECOVERY Year Tagged QR 1971 1972 1973 1974 8 6 26 50 2 - 1 2 4 9 20 s 6 7 8 9 10 11 12 13+ Totals 43 34 38 133 5 1975 1976 1977 1978 TOTAL 1 36 10 4 141 - 2 1 8 2 23 56 123 4 6 30 4 122 3 31 30 1 14 21 7 7 43 20 4 4 2 15 - 2 2 1 - 12 -1 4 - 1 1 28 8 49 92 77474 Read the entire page →
From page 57... ... To obtain more detailed information, the file MRFISH was searched for data on fish tagged from 1960 to 1981 in the west with a single tag. Table 3-5 shows He number tagged by year; Table 3-18 shows the recover ies of single tags in the western Atlantic Ocean by year and quarter after tagging; and Table 3-19 shows He eastern Atlantic Ocean recoveries by year and quarter after tagging. Read the entire page →
From page 58... ... 1251.5418 0.4574 0.5216 228141 19 0.3751.9300 0.2542 0.4583 228 3 0.6252.4062 0.0915 0.3570 122 1 0.875-0.4567 0.2902 0.1601 110123 37 1.1250.0390 0.2340 0.1925 170122 59 1.3750.7989 0.1326 0.2949 123 3 1.6250.9747 0.1028 0.3444 132 3 1.8750.2414 0.1089 0.1359 6531 18 2.1250.2699 0.1557 0.1908 7130 30 2.3750.6332 0.1058 0.2919 61 2 2.6250.2394 0.6134 0.3491 52 6 2.8750.6232 0.0634 0.2411 81 2 B. Time OutDb Db Db Sing Db Db CatchCatch Catch Mid Pointvs Sing vs Sing vs Db Sing SingDb Db Db Sing 0.1251.5417 0.4574 0.5216 274169 23 0.3751.9300 0.2542 0.4583 2610 4 0.6252.4062 0.0915 0.3570 142 1 0.875-0.4567 0.2902 0.1601 132148 44 1.1250.0390 0.2340 0.1925 204146 71 1.3750.7989 0.1326 0.2949 144 4 1.6250.9747 0.1028 0.3444 162 4 1.8750.2414 0.1089 0.1359 7837 22 2.1250.2699 0.1557 0.1908 8536 36 2.3750.6332 0.1058 0.2919 71 2 2.6250.2394 0.6134 0.3491 62 7 2.8750.6232 0.0634 0.2411 101 2 Sing = Tagged with single tag - recovered with tag Db Db = Tagged with 2 or more tags - recovered with 2 or more tags Db Sing = Tagged with 2 or more tags - recovered with one tag Almost all double tagged fish had only 2 tags. Read the entire page →
From page 59... ... A and B show two different estimates of tag shedding. A Time Initial Inst. Read the entire page →
From page 60... ... A and B show two different estimates of tag shedding. A Time Initial Inst. Read the entire page →
From page 61... ... A and B show two different estimates of tag shedding. A Time Initial Inst. Read the entire page →
From page 62... ... A and B show two different estimates of tag shedding. Time Initial Inst. Read the entire page →
From page 63... ... 63 Year UnknownWest EastTotal Percent Tagged AreaArea AreaKnown Known East 1965 10238 19257 7.393 1966 471,107 181,125 1.600 1967 4181 3184 1.630 1968 3113 0113 0.000 1969 10102 2104 1.923 1970 19162 9171 5.263 1971 578 078 0.000 1972 172 173 1.370 1973 367 168 1.471 1974 16262 0262 0.000 1975 355 055 0.000 1976 85247 1248 0.403 1977 6331 4335 1.194 1978 2185 5190 2.632 1979 349 150 2.000 1980 0266 2268 0.746 1981 067 168 1.471 TOTALS 2173,582 673,649 1.836 TABLE 3-17 Atlantic bluefin tuna tagged in the western Atlantic Ocean with a single tag. Ratio of eastern Atlantic recoveries to western recoveries as a function of time before recapture. Read the entire page →
From page 64... ... .. ~ ", ~ Atlantic Ocean and recovered from the western Atlantic Ocean by year and by number of quarters out. Read the entire page →
From page 65... ... TRANSATLANTIC MOVEMENT OF ATLANTIC BLUEFIN TUNA as tern r 65 4 i 15 16 17 1 4 1 1 2 2 1 3 - - 1 1 - 1 - 1 - 1 - - - 1 - - - 3 1 - 5 - 1 1 2 1 8 19 20 21 22 23 24 25 26 27 28 29 30 31 + - 1 1 1 1 3 1 - - 4 10 10 1 1 2 2 Read the entire page →
From page 66... ... in Table 33 (eastern Atlantic Ocean) were expanded by the ratio 356 to 280 to obtain an age-frequency data set for VPA analysis. Read the entire page →
From page 67... ... /20,951 in Table 3-23. Estimates of Fe, Ze, Fw and Zw were obtained by dividing totals of the appropriate rates by the total number of time units to obtain average values. Read the entire page →
From page 68... ... * + + + 0.70 1.40 2.10 Elapsed Time (years) Read the entire page →
From page 69... ... TRANSATLANTIC MOVEMENT OF ATIANTIC BLUEFIN TUNA 69 TABLE 3-21 Atlantic bluefin tuna tagged in the western Atlantic Ocean from 1960 to 1981 with a single tag and recovered in He western Atlantic Ocean vs. years before recapture and a regression analysis of He natural logarithm of catch number against years out (data in file MRFISH provided by NMFS) Read the entire page →
From page 70... ... Mort. Shed Rate Time Units 1 587.3 193.00 0.8922 0.1400 0.2600 0.50 2 307.8 107.00 0.5351 0.1400 0.2600 1.00 3 120.8 37.00 0.4558 0.1400 0.2600 1.00 4 51.3 14.00 0.3954 0.1400 0.2600 1.00 5 23.2 5.00 0.3001 0.1400 0.2600 1.00 TOTALS 356.00 2.1325 0.6300 1.1700 4.50 Time Initial Pop Catch Fish. Read the entire page →
From page 71... ... Mort. Shed Rate Time Units 1 2,047.9 193.00 0.2193 0.1400 0.2600 0.50 2 1,502.6 107.00 0.0902 0.1400 0.2600 1.00 3 920.4 37.00 0.0499 0.1400 0.2600 1.00 4 586.9 14.00 0.0294 0.1400 0.2600 1.00 5 382.0 5.00 0.0160 0.1400 0.2600 1.00 TOTALS 356.00 0.2952 0.6300 1.1700 4.50 Time Initial Pop Catch Fish. Read the entire page →
From page 72... ... Mort. Shed Rate Time Units 1 13,739.91,471.00 0.2507 0.1400 0.2600 0.50 2 9,924.01,386.00 0.1845 0.1400 0.2600 1.00 3 5,53 1.6309.00 0.0700 0.1400 0.2600 1.00 4 3,457.159.00 0.0209 0.1400 0.2600 1.00 5 2,269.426.00 0.0139 0.1400 0.2600 1.00 6 1,500.37.00 0.0056 0.1400 0.2600 1.00 7 1,000.044.00 0.0184 0.1400 0.2600 10.00 TOTALS 3,302.00 0.6044 2.1700 4.0300 15.50 Time Initial PopCatch Fish. Read the entire page →
From page 73... ... Mort. Shed Rate Time Units 1 6,945.21,471.00 0.5296 0.1400 0.2600 0.50 2 4,363.31,386.00 0.4771 0.1400 0.2600 1.00 3 1,815.0309.00 0.2293 0.1400 0.2600 1.00 4 967.359.00 0.0768 0.1400 0.2600 1.00 5 600.526.00 0.0539 0.1400 0.2600 1.00 6 381.47.00 0.0224 0.1400 0.2600 1.00 7 250.044.00 0.0854 0.1400 0.2600 10.00 TOTALS 3,302.00 1.9787 2.1700 4.0300 15.50 Time Initial PopCatch Fish. Read the entire page →
From page 74... ... Pe = Fraction of captured tags which are reported in the east Fw = Annual instantaneous fishing mortality rate in the west. Fe = Annual instantaneous fishing mortality rate in the east. Read the entire page →
From page 75... ... Pe = Fraction of captured tags which are reported in the east. Fw = Annual instantaneous fishing mortality rate in the west. Read the entire page →
From page 76... ... The results of this reanalysis of tagging data provide quantitative conf~ation of the empirical results on transfer rates presented earlier in Chapter 3. Although the committee was unable to obtain variance estimates for these transfer rates due to time constraints, results are robust with respect to reporting rate, the parameter most likely to affect He results. Read the entire page →
From page 77... ... This example shows that small annual transfer rates can have a large effect on population dynamics over a relatively short time period. Because none of the fish tagged in the eastern Atlantic Ocean were from the Mediterranean Sea, caution should be exercised in interpreting the east to west movement rate. Read the entire page →

From page 39...

... Atlantic bluffers tuna were marked and released in the western Atlantic Ocean from 1954 in varying numbers until 1987 (Parrack, 1990~. The total number tagged by the National Marine Fisheries Service (NMFS)

3 Transatlantic Movement of Atlantic Bluefin Tuna Pages 39-78

3 Transatlantic Movement of Atlantic Bluefin Tuna
Pages 39-78