scholarly journals An application of the annual egg production method to estimate the spawning biomass of cod (Gadus morhua L.), plaice (Pleuronectes platessa L.) and sole (Solea solea L.) in the Irish Sea

2001 ◽  
Vol 58 (1) ◽  
pp. 183-203 ◽  
Author(s):  
M Armstrong
Keyword(s):  
Egg Production ◽  
Gadus Morhua ◽  
Production Method ◽  
Irish Sea ◽  
Pleuronectes Platessa ◽  
Solea Solea ◽  
The Irish Sea ◽  
Spawning Biomass

scholarly journals On the Food of Young Plaice (Pleuronectes platessa)

1922 ◽  
Vol 12 (4) ◽  
pp. 678-687 ◽  
Author(s):  
Andrew Scott
Keyword(s):  
Present Report ◽  
Stomach Contents ◽  
Annual Reports ◽  
Irish Sea ◽  
Pleuronectes Platessa ◽  
Larval Stages ◽  
Marine Biological Association ◽  
Open Sea ◽  
Pelagic Eggs ◽  
The Irish Sea

The investigation of the food contents in the stomachs of young fishes was included in the scheme of scientific investigations drawn up and initiated by Professor Herdman for the Lancashire Sea Fisheries Committee nearly thirty years ago. The lengthy series of Annual Reports contain here and there accounts of the observations made on the stomach contents of various Pleuronectidæ captured close inshore, and the pelagic stages of other fishes caught from time to time in the plankton tow-nets. No systematic attempt has, however, been made, in connection with the investigation of the Irish Sea, to determine the food of any particular species of fish during the early part of its life history.Other observers working in other areas, notably Dr. Marie Lebour at Plymouth, have added very much to our knowledge of the early food of young fishes. Dr. Lebour's reports, published in the Journal of the Marine Biological Association, Vols. XI and XII, deal with a very large number of larval and post-larval stages of the more important food fishes caught in the tow-nets and young fish-trawl in Plymouth Sound and beyond.The present report gives an account of the food contained in the stomachs of young plaice (Pleuronectes platessa, Linn.) from a few days after hatching to about five months old. The samples examined in April and May were taken from the spawning pond at Port Erin, Isle of Man, where they had hatched from the pelagic eggs spawned by the adult plaice early in 1921. The later stages examined during May to August represented young plaice hatched in the open sea about the same time as those in the pond, and which had made their way close inshore.

Use of the daily egg production method to estimate the stock size of Western Australian sardines (Sardinops sagax)

1996 ◽  
Vol 47 (6) ◽  
pp. 819 ◽  
Author(s):  
WJ Fletcher ◽  
NCH Lo ◽  
EA Hayes ◽  
RJ Tregonning ◽  
SJ Blight
Keyword(s):  
Western Australia ◽  
Egg Production ◽  
Production Method ◽  
Purse Seine ◽  
Batch Fecundity ◽  
Stock Size ◽  
Production Values ◽  
Sardinops Sagax ◽  
Western Australian ◽  
Spawning Biomass

The daily egg production method was used to estimate the spawning biomass of the sardine Sardinops sagax in the Albany region of Western Australia. Plankton surveys covering 10000 - 14000 km² were completed in July of 1991 and 1992 in three to five days using up to three boats. Adult sardines were obtained from the local purse-seine fleet. The spawning area was similar in both years at approximately 3800 km² (1100 nmile²), but the number of eggs collected was larger in 1991 with egg production values of 6.5 per 0.05 m2 day-1 compared with 3.9 per 0.05 m2 day-1 in 1992. The average batch fecundity values were similar (approximately 11000 eggs female-1) as were the proportions spawning (0.13 in 1991; 0.09 in 1992). The calculated biomass estimates were 23 121 t (CV = 0.51) and 16 121 t (CV = 0.44) in 1991 and 1992 respectively.

Feeding habits of the Order Pleuronectiformes and its relation to the sediment type in the north Irish Sea

2003 ◽  
Vol 83 (3) ◽  
pp. 593-601 ◽  
Author(s):  
F. Amezcua ◽  
R.D.M. Nash ◽  
L. Veale
Keyword(s):  
Multivariate Analyses ◽  
Feeding Habits ◽  
Irish Sea ◽  
Individual Species ◽  
Sediment Type ◽  
The North ◽  
Sediment Types ◽  
Solea Solea ◽  
The Irish Sea ◽  
Dover Sole

The diets of scaldfish Arnoglossus laterna, dab Limanda limanda, lemon sole Microstomus kitt, long rough dab Hippoglossoides platessoides, solenette Buglossidium luteum, thickback sole Microchirus variegatus, plaice Pleuronectes platessa, witch Glyptocephalus cynoglossus and Dover sole Solea solea in the Irish Sea were determined for March and October 1997 and 1998 and compared. Similarities in diets were examined using multivariate analyses. In general, there were differences in diet between species and generally the diets were similar within a species. Smaller individuals tended to have a similar diet. There were seasonal changes in the diets of individual species. Likewise, the overlap in diets between species changed between seasons and to a certain extent between sediment types.

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