CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ...
CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ... CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ...
HUNTER ET AL.: SABLEFISH REPRODUCTION CalCOFl Rep., Vol. 30,1989 Total Fecundity The total number of advanced oocytes in the ovaries (FT) of sablefish captured in October 1986 increased linearly with female weight (Win grams), F, -45,223 + 125.1 W, o ! 1 0 200 400 600 fathoms 800 1 ; : ; : ; ; ; ; ; ; ; ; ; ; 0 200 400 600 800 1000 1200 meters DEPTH Figure 4. Catch rate of sablefish taken in 400-mesh Eastern trawl at 100- fath. (183-111) depth classes: open circles, 1987 survey; solid circles, 1988 survey. where Y’ = 0.50; figure 6, upper, and table 2. According to this equation the total potential relative fecundity (F,/W) of the sablefish taken in October ranged from 100 oocytedg female weight for a 1.8- kg female, to 107 for a 2.5-kg fish. The relation between female fork length (L) and fecundity (F,) was F, = 2.145 x L3.616 wherev’ = 0.40. 500 - 400 - ====/ =1 E 1 z w E 0 2.2 1 1.8: 1.4 1 11 0.6 1 300 - F,= -45,223 + 125.1W r2=0.50 0.2 -, 100 80 du I I I 1 I 1 I 300 1 0 40 20 640 E - E 600- I 560 ~ & 520 2 y 480- Y 440 ~ a 2 400- 360 , - 080 0 0 . F, = 54.100 + 33W rz= 0.17 F,. = -2.650 + a2w r2=0.4 1 WEIGHT (gm x 1000) Figure 6. Upperpanel, number of advanced oocytes in sablefish ovaries in October 1986 as a function of ovary-free female weight (N = 45). Lower panel, standing stock of advanced oocytes in January-February 1987 as a function of ovary-free female weight: open circles, no postovulatory follicles present in ovary; solid circles, postovulatory follicles present in ovary. Solid line, regression for all data (N = 41); dashed line, regression where ovaries with postovulatory follicles are omitted (N = 28). 66
~ ~~ ~~ HUNTER ET AL.: SABLEFISH REPRODUCTION CalCOFl Rep., Vol. 30,1989 TABLE 2 Standing Stock of Oocytes in Sablefish Ovaries in Order of Female Weight (Ovary-Free) Within a Survey Period October 20 to 28,1986 Wet weight ____ (g) - 1165 1218 1535 1654 1686 1752 1766 1797 1797 1891 1922 1988 2062 2118 2164 2182 2183 2184 2206 2207 2221 2241 2290 2312 2330 2345 2351 2362 2375 2414 2434 2440 2465 2472 2519 2534 2579 2595 2660 2728 2793 2878 2888 2953 3015 3096 3275 3394 3730 4328 Female Fork length . LmmL 500 510 560 540 550 560 560 550 580 570 570 630 570 590 590 590 620 610 590 600 610 580 610 620 600 590 590 600 600 620 630 610 620 610 650 620 630 610 620 620 640 640 560 640 670 670 650 680 690 720 Ovary weight (g) 110 49 125 72 29 93 80 63 184 122 128 202 99 122 141 112 97 100 123 178 129 149 126 159 126 145 164 65 111 171 156 121 58 65 96 107 91 251 106 242 264 124 132 127 224 189 145 136 370 409 Standing stock of advanced oocytes (thousands) 132 97 146 140 51 80 161 143 224 189 249 505 160 243 281 154 141 288 126 232 291 336 163 161 171 232 151 270 339 176 155 291 234 388 199 316 295 382 333 261 335 426 201 344 334 401 439 556 405 356 January 16 to February 13,1987 Thousands of Female advanced oocytes Wet Fork Ovary weight length weight Non- (g) (mm) - (g) hydrated Hydrated Total 944 474 86 62 0 62 1173 528 133 136 0 136 1228 500 172 149 0 149 1262 515 235 0 54 54 1300 520 136 139 0 139 1355 502 281 1 59 60 1394 538 130 0 23 23 1418 552 194 0 41 41 1434 522 148 124 0 124 1441 530 104 80 0 80 1515 540 109 78 0 78 1525 557 125 112 0 112 1529 548 237 6 53 59 1543 550 169 138 0 138 1568 540 194 132 0 132 1645 632 791 103 134 237 1656 540 169 114 0 114 1698 547 171 126 0 126 1722 572 147 21 63 84 1729 545 355 64 51 115 1760 524 245 143 0 143 1779 545 291 14 86 100 1799 577 109 91 0 91 1807 595 77 6 0 6 1892 550 238 182 0 182 1920 560 215 131 0 131 1958 595 134 116 0 116 2003 605 423 74 71 145 2094 590 268 194 0 194 2107 610 153 0 22 22 2143 597 351 264 I, 264 2215 590 163 178 0 178 2291 594 239 164 0 164 2309 620 391 28 82 110 2470 630 315 2 62 63 2501 636 44 22 0 22 2744 582 296 173 0 173 2838 625 122 0 17 17 2866 660 564 207 99 306 3058 665 326 0 69 69 6543 818 938 31 255 286 Postovulatory follicles + = present - = absent - - - + - + - - - - + - - - - - - - - - - + - - - - - + - - - + - + - + By January-February 1987, the standing stock of advanced oocytes had declined to about 60% of oocyte stock observed in October 1986, and was only weakly correlated with female weight: Y* = 0.17, (figure 6, lower). Statistical documentation for this seasonal decline in oocyte standing stock is provided by multiple regression of fecundity on elapsed time and female weight: F, = 54077 + 32.8 W, F, = 95,202 -1150 T + 5.71 W, 67
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HUNTER ET AL.: SABLEFISH REPRODUCTION<br />
CalCOFl Rep., <strong>Vol</strong>. <strong>30</strong>,<strong>1989</strong><br />
TABLE 2<br />
Standing Stock of Oocytes in Sablefish Ovaries in Order of Female Weight (Ovary-Free) Within a Survey Period<br />
October 20 to 28,1986<br />
Wet<br />
weight<br />
____ (g) -<br />
1165<br />
1218<br />
1535<br />
1654<br />
1686<br />
1752<br />
1766<br />
1797<br />
1797<br />
1891<br />
1922<br />
1988<br />
2062<br />
2118<br />
2164<br />
2182<br />
2183<br />
2184<br />
2206<br />
2207<br />
2221<br />
2241<br />
2290<br />
2312<br />
23<strong>30</strong><br />
2345<br />
2351<br />
2362<br />
2375<br />
2414<br />
2434<br />
2440<br />
2465<br />
2472<br />
2519<br />
2534<br />
2579<br />
2595<br />
2660<br />
2728<br />
2793<br />
2878<br />
2888<br />
2953<br />
<strong>30</strong>15<br />
<strong>30</strong>96<br />
3275<br />
3394<br />
37<strong>30</strong><br />
4328<br />
Female<br />
Fork<br />
length<br />
. LmmL<br />
500<br />
510<br />
560<br />
540<br />
550<br />
560<br />
560<br />
550<br />
580<br />
570<br />
570<br />
6<strong>30</strong><br />
570<br />
590<br />
590<br />
590<br />
620<br />
610<br />
590<br />
600<br />
610<br />
580<br />
610<br />
620<br />
600<br />
590<br />
590<br />
600<br />
600<br />
620<br />
6<strong>30</strong><br />
610<br />
620<br />
610<br />
650<br />
620<br />
6<strong>30</strong><br />
610<br />
620<br />
620<br />
640<br />
640<br />
560<br />
640<br />
670<br />
670<br />
650<br />
680<br />
690<br />
720<br />
Ovary<br />
weight<br />
(g)<br />
110<br />
49<br />
125<br />
72<br />
29<br />
93<br />
80<br />
63<br />
184<br />
122<br />
128<br />
202<br />
99<br />
122<br />
141<br />
112<br />
97<br />
100<br />
123<br />
178<br />
129<br />
149<br />
126<br />
159<br />
126<br />
145<br />
164<br />
65<br />
111<br />
171<br />
156<br />
121<br />
58<br />
65<br />
96<br />
107<br />
91<br />
251<br />
106<br />
242<br />
264<br />
124<br />
132<br />
127<br />
224<br />
189<br />
145<br />
136<br />
370<br />
409<br />
Standing<br />
stock of<br />
advanced<br />
oocytes<br />
(thousands)<br />
132<br />
97<br />
146<br />
140<br />
51<br />
80<br />
161<br />
143<br />
224<br />
189<br />
249<br />
505<br />
160<br />
243<br />
281<br />
154<br />
141<br />
288<br />
126<br />
232<br />
291<br />
336<br />
163<br />
161<br />
171<br />
232<br />
151<br />
270<br />
339<br />
176<br />
155<br />
291<br />
234<br />
388<br />
199<br />
316<br />
295<br />
382<br />
333<br />
261<br />
335<br />
426<br />
201<br />
344<br />
334<br />
401<br />
439<br />
556<br />
405<br />
356<br />
January 16 to February 13,1987<br />
Thousands of<br />
Female<br />
advanced oocytes<br />
Wet Fork Ovary<br />
weight length weight Non-<br />
(g) (mm)<br />
-<br />
(g) hydrated Hydrated Total<br />
944 474 86 62 0 62<br />
1173 528 133 136 0 136<br />
1228 500 172 149 0 149<br />
1262 515 235 0 54 54<br />
1<strong>30</strong>0 520 136 139 0 139<br />
1355 502 281 1 59 60<br />
1394 538 1<strong>30</strong> 0 23 23<br />
1418 552 194 0 41 41<br />
1434 522 148 124 0 124<br />
1441 5<strong>30</strong> 104 80 0 80<br />
1515 540 109 78 0 78<br />
1525 557 125 112 0 112<br />
1529 548 237 6 53 59<br />
1543 550 169 138 0 138<br />
1568 540 194 132 0 132<br />
1645 632 791 103 134 237<br />
1656 540 169 114 0 114<br />
1698 547 171 126 0 126<br />
1722 572 147 21 63 84<br />
1729 545 355 64 51 115<br />
1760 524 245 143 0 143<br />
1779 545 291 14 86 100<br />
1799 577 109 91 0 91<br />
1807 595 77 6 0 6<br />
1892 550 238 182 0 182<br />
1920 560 215 131 0 131<br />
1958 595 134 116 0 116<br />
2003 605 423 74 71 145<br />
2094 590 268 194 0 194<br />
2107 610 153 0 22 22<br />
2143 597 351 264 I, 264<br />
2215 590 163 178 0 178<br />
2291 594 239 164 0 164<br />
2<strong>30</strong>9 620 391 28 82 110<br />
2470 6<strong>30</strong> 315 2 62 63<br />
2501 636 44 22 0 22<br />
2744 582 296 173 0 173<br />
2838 625 122 0 17 17<br />
2866 660 564 207 99 <strong>30</strong>6<br />
<strong>30</strong>58 665 326 0 69 69<br />
6543 818 938 31 255 286<br />
Postovulatory<br />
follicles<br />
+ = present<br />
- = absent<br />
-<br />
-<br />
-<br />
+<br />
-<br />
+<br />
-<br />
-<br />
-<br />
-<br />
+<br />
-<br />
-<br />
-<br />
-<br />
-<br />
-<br />
-<br />
-<br />
-<br />
-<br />
+<br />
-<br />
-<br />
-<br />
-<br />
-<br />
+<br />
-<br />
-<br />
-<br />
+<br />
-<br />
+<br />
-<br />
+<br />
By January-February 1987, the standing stock of<br />
advanced oocytes had declined to about 60% of<br />
oocyte stock observed in October 1986, and was<br />
only weakly correlated with female weight:<br />
Y* = 0.17, (figure 6, lower). Statistical documentation<br />
for this seasonal decline in oocyte standing<br />
stock is provided by multiple regression of fecundity<br />
on elapsed time and female weight:<br />
F, = 54077 + 32.8 W, F, = 95,202 -1150 T + 5.71 W,<br />
67
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