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Mortalidad por pesca (F), tasa de explotacion (E), porcentaje de remocion anual (R%) y los puntos de referencia biologicos (Fopt) (Fiimit) para las 14 principales especies de peces de la cuenca del rio Apure durante el periodo (2002-2003).
Based on the outputs from two types of fishery data it is delineated that biological reference points of fishing limitation (Flimit), optimum fishing level (Fopt) and maximum sustainable yield (MSY) from two production models for swimming crab have been overharvest.
Following method of Gulland (1969) biological reference points BRP of Flimit and Fopt were estimated for swimming crab.
The estimated population parameter from twelve year pooled data sets were 265 mm, 0.29 yr-1, 1.66 yr-1, 1.25 yr-1, 0.39 yr-1, 0.88 yr-1, 0.65 yr-1 for asymptotic length (La), growth (K), total mortality (Z), fishing mortality (F), natural mortality (M), and biological reference points of Flimit and Fopt respectively (Table 1, Fig.
Furthermore, when using Gulland (1971) biological reference points Fopt was equal to M (1.685).
FOPT Forecast optimism defined as As above the difference between the one-year-ahead consensus earnings forecast and realized earnings deflated by June-end stock price.
IO 53.36 36.58 54.68 70.71 22.62 WACR 19.00 16.34 18.71 21.28 4.14 LTIO 12.23 5.92 10.93 16.86 8.47 STIO 18.00 9.33 16.20 24.72 11.68 BETA 1.20 0.76 1.11 1.52 0.67 IDRISK 0.11 0.08 0.10 0.14 0.05 SIZE 6.43 5.15 6.28 7.57 1.74 BTM 0.52 0.28 0.45 0.68 0.34 MMT 0.11 -0.11 0.11 0.33 0.41 LEV 0.18 0.03 0.16 0.29 0.16 FOPT 0.01 0.00 0.00 0.01 0.04 LTG 17.30 12.00 15.17 20.50 7.87 DISP 0.11 0.02 0.04 0.10 0.23 Table IV.
The biological reference points were estimated following the Gulland (1969) method Fopt = M.
Optimum (Fopt) and maximum (Flimit) fishing mortality biological reference point were estimated for the target species.
Fishing mortality rate of 0.71 and 1.3 in both species was substantially greater than the targets/ biological reference points Fopt, and Flimit and optimum level (Gulland, 1971).
tumbil were estimated by using Gulland (1969) method, the optimum fishing mortality is Fopt = M.
When using the Gulland (1971) biological reference point Fopt was equal to M (0.716).
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- Foppa, Vincenzo
- Foppington, Lord
- For (;;)
- For (;;)
- for (a/some) reason(s) best known to (oneself)
- for (all) one's trouble
- for (all) practical purposes
- for (one's) (own) good
- for (one's) (own) sake
- for (one's) benefit
- for (one's) eyes only