Wyniki wyszukiwania

1

The European anchovy [Engraulis encrasicolus [L.]] in the Baltic Sea

100%

Draganik B., Wyszynski M.

Bulletin of the Sea Fisheries Institute

|

2004

|

nr 2

2

Nematodes found in the European anchovy (Engraulis encrasicolus), a rare visitor to the Baltic Sea

72%

Kulikowski M., Rolbiecki L., Skora K., Rokicki J.

Oceanological and Hydrobiological Studies

|

2012

|

tom 41

|

nr 3

3

An analysis of the impacts of climatic variability and hydrology on the coastal fisheries, Engraulis encrasicolus and Sepia officinalis, of Portugal

72%

Ullah H., Leitao F., Baptista V., Chicharo L.

International Journal of Ecohydrology and Hydrobiology

|

2012

|

tom 12

|

nr 4

4

Stock assessment of the Adriatic anchovy [Engraulis encrasicolus L.] using egg surveys

72%

Dulcic J.

Acta Ichthyologica et Piscatoria

|

1993

|

tom 23

|

nr 1

69-76

The results of anchovy stock assessment during surveys in periods 1976-1984 and 1989-1990 are given. The influence of the curves of spawning intensity on the error in stock assessment is also discussed. During the periods of surveys it was observed that anchovy stock was decreasing. Estimates using the batch fecundity method show that anchovy stocks were highly overestimated because their fecundity was underestimated. It is obvious that in future surveys in the Adriatic, the batch fecundity methods has to be applied.

5

Estimate of spawning biomass of anchovy, Engraulis encrasicolus, in the eastern part of Adriatic from 1989 to 1990 by means of egg surveys

58%

Dulcic J., Cetinic P.

Acta Ichthyologica et Piscatoria

|

1993

|

tom 23

|

nr 2

67-76

The objective of the study was to present the results of anchovy stock assessment for one period (1989-1990) of surveys and to estimate maximum sustainable yield on the basis of the estimated spawning biomass. Anchovy stock has not been fully exploited during that period but was decreasing and affected by long term fluctuations in biomass.

6

Effects of alterations in freshwater supply on the abundance and distribution of Engraulis encrasicolus in the Guadiana estuary and adjacent coastal areas of South Portugal

58%

Chicharo L., Chicharo M. A., Esteves E., Andrade J. P., Morais P.

International Journal of Ecohydrology and Hydrobiology

|

2001

|

tom 01

|

nr 3

A reduction of inflow to the Guadiana River on the border between Portugal and Spain may directly contribute to the degradation of fish habitats. Changes are expected to the spawning behaviour of Engraulis encrasicolus adults, to the migration patterns of larvae in the estuary, and to the catches of fisheries in the lower part of the river and adjacent coastal areas. Spawning of E. encrasicolus occurs in the lower part of the estuary and in the adjacent coastal areas. However, high abundances of larvae have been registered in the middle and upper parts of the estuary, the most productive region of the estuary, that with the estuarine turbidity maximum (ETM). In a year of normal inflow, such as the hydrologic year 1987–1988, some retention of larvae occurred in this area. However, in an abnormal hydrologic year with a low inflow (1999–2000), and with an increase in freshwater inflow during the spring months, a disturbance to the migration pattern seems to have affected the survival of larvae in the estuary. High river inflow, probably associated with an increased input of nutrients, appears to have an important and positive effect on adult numbers, because anchovy fishery catches in the adjacent coastal area increased under these conditions.

Ograniczanie wyników

2 Acta Ichthyologica et Piscatoria

2 International Journal of Ecohydrology and Hydrobiology

1 Bulletin of the Sea Fisheries Institute

1 Oceanological and Hydrobiological Studies

2 Chicharo L.

2 Dulcic J.

1 Andrade J. P.

1 Baptista V.

1 Cetinic P.

1 Chicharo M. A.

1 Draganik B.

1 Esteves E.

1 Kulikowski M.

1 Leitao F.

1 Morais P.

1 Rokicki J.

1 Rolbiecki L.

1 Skora K.

1 Ullah H.

1 Wyszynski M.

2 2012

1 2004