KONINKLIJKE ACADEMIE VOOR OVERZEESE WETENSCHAPPEN ...

More documents

Recommendations

Info

— 284 — — H2S: by using Iodine method; — COD: by using Permanganat method. Natural foods including phytoplankton, zooplankton and zoobenthos were identified and counted based on the methods of S h ir o ta (1966), T h a n h (1979), B o y d & T u c k e r (1992). The phytoplankton, zooplankton and zoobenthos were collected monthly by using the plankton net (mesh sizes N° 25, N° 60) and Petersen bottom sampler with the total area of 28 cm2. The number of taxa, the density of phytoplankton and zooplankton were measured with a Sedgwick - Rafter counting chamber. The number of taxa, the density of zoobenthos were analysed following the method of T h a n h (1979). — Fish Growth Parameters Monthly, thirty fish samples per pond were sampled to determine fish growth with the parameters as daily weight gain (g/day) and specific growth rate (%/day). P2- P , + Daily weight gain (g/day) = ----------------------t2 - 1| Ln P, - Ln P, + Specific growth rate (%/day) = ------------------------------- x 100 t2 - ti Where Pi = Mean initial weight t, (g) P2 = Mean final weight t2 (g) t2 - 1, (days) Number of harvested fish + Survival rate (%) = -------------------------------------------------- x 100 Number of stocked fish + Fish yield (kg/ha) = ■ + Cost ratio benefit = + Cost ratio profit = ■ — Data Analysis Final total fish weight (kg) Total pond area (ha) Gross return household Paid-out cost Total farm net return Total investment cost The survival rate of fingerlings was calculated at the end of the experiment or at day 45th. The survival rate, the yield of fish biomass and the household income (cost ratio benefit, cost ratio profit) from the intensive culture system
285 — were calculated at the end of the culture cycle (six months). Finally, these data were statistically analysed and compared by using one-way ANOVA (N eter et al. 1996) and the software package of statistica 5.5 and Excel 6 .0 for evaluating the results of the culture system treatments. 3. Results and Discussion 3 .1 . B iological C h aracteristics of C lim bin g P erch Climbing perch (Anabas testudineus Bloch, 1 7 9 2 ) is known as species of high flesh quality and high market price (fig. 2). Throughout its activity of air-breathing (fig. 3), climbing perch can survive in a variety of habitats in nature. Fig. 2. — Climbing perch (Anabas testudineus Bloch, 1792). Fig. 3. — Air-breathing system of climbing perch.
Page 1 and 2: KONINKLIJKE ACADEMIE VOOR OVERZEESE
Page 3 and 4: ERRATUM Mededelingen der Zittingen
Page 5 and 6: WETENSCHAPPELIJKE MEDEDELINGEN COMM
Page 7 and 8: Meded. Zitt. K. Acad. Overzeese Wet
Page 9 and 10: — 243 — Fig. 1. — Le plateau
Page 11 and 12: — 245 — La taille des concentra
Page 13 and 14: 1 2 Fig. 2. — ‘b n-Naga, probab
Page 15 and 16: — 249 — . * '\ tjffi. 1 • •
Page 17 and 18: — 251 — chasse munis de cellule
Page 19 and 20: — 253 — croissant, haches fenes
Page 21 and 22: — 255 — comporter des individus
Page 25 and 26: — 259 — oostelijk Congo verplaa
Page 27 and 28: — 261 — eenmaal de linkse opsta
Page 29 and 30: — 263 — rond het gebied van Pun
Page 31 and 32: — 265 — aan een Congolese grens
Page 33 and 34: — 267 — ondernemen om onze land
Page 35 and 36: — 269 — hun nieuwe identiteitsp
Page 37 and 38: — 271 — 8. Spanning tussen Rwan
Page 39 and 40: — 273 — Op grond van de weigera
Page 41 and 42: — 275 — President toe, was het
Page 45 and 46: — 281 — — The fish biological
Page 47: — 283 — Table 2 Feed and feedin
Page 51 and 52: — 287 — Fig. 4. — Pellet for
Page 53 and 54: — 289 — Fig. 8. — Male of cli
Page 55 and 56: — 291 — The results show no sta
Page 57 and 58: — 293 — 3.1.4.5. Experiment 3:
Page 59 and 60: — 295 — 15/11/04 14/12/04 18/1/
Page 61 and 62: — 297 — lebes, Assulina seminul
Page 63 and 64: — 299 — ment I (85.5 %). Finall
Page 65 and 66: — 301 — 4. Conclusions Througho
Page 69 and 70: — 305 — F ig . 1. — A rb re p
Page 71 and 72: angle EAS-AC-EPS 130*- 50- 30- - -
Page 73 and 74: B — 309 — Fig. 4. — Modèles
Page 75 and 76: — 311 — Des trois fossiles, Shu
Page 77 and 78: Fig. 7. — Transfert et stockage d
Page 79 and 80: — 315 — Les dessins digitaux, p
Page 81 and 82: — 317 — tion «Tous parents, to
Page 83 and 84: — 319 — O rban, R. 1982. A biom
Page 87 and 88: — 325 — époque déterminée, d
Page 89 and 90: — 327 — Précisons tout d’abo
Page 91 and 92: — 329 — recueillies à cette oc
Page 93 and 94: — 331 — 5. Les choix stratégiq
Page 95 and 96: — 333 — 1 ’enseignement secon
Page 97 and 98: — 335 — qu’il faut incriminer
Page 99 and 100:
Meded. Zitt. K. Acad. Overzeese Wet
Page 101 and 102:
— 339 — Anyone more or less fam
Page 103 and 104:
— 341 — GPS observations can be
Page 105 and 106:
M A — 343 — Fig. 7. — Referen
Page 107 and 108:
— 345 — Fig. 9. — The densifi
Page 109 and 110:
— 347 — Fig. 11. — Destroyed
Page 111 and 112:
— 349 — Acp" = O" 004 AX" = 0"0
Page 113 and 114:
Meded. Zitt. K. Acad. Overzeese Wet
Page 115 and 116:
— 353 — Le monde ouvert par Ras
Page 117 and 118:
— 355 — réflexion se développ
Page 119 and 120:
— 357 — clergé africain de dem
Page 121 and 122:
— 359 — place très marginale.
Page 123 and 124:
— 361 — Bontinck ne se limita t
Page 125 and 126:
— 363 — au Congo, à l’initia
Page 127 and 128:
NOTULEN — PROCES-VERBAUX
Page 129 and 130:
Classe des Sciences morales et poli
Page 131 and 132:
— 369 — Nominations Par Arrêt
Page 133 and 134:
Classe des Sciences morales et poli
Page 135 and 136:
— 373 — «De evacuatie uit Cong
Page 137 and 138:
Classe des Sciences naturelles et m
Page 139 and 140:
— 377 — Approche satellitaire d
Page 141 and 142:
Classe des Sciences naturelles et m
Page 143 and 144:
— 381 — «New Hope to Fill the
Page 145 and 146:
— 383 — Van Damme, W. 1999. Med
Page 147 and 148:
Classe des Sciences techniques Séa
Page 149 and 150:
Classe des Sciences techniques Séa
Page 151 and 152:
— 389 — «Hubs, Harbours and De
Page 153:
CO N TEN TS Scientific Papers Secti
show all

KONINKLIJKE ACADEMIE VOOR OVERZEESE WETENSCHAPPEN ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?