1,721,009 research outputs found
Analisi dello sbarcato di Merluccius merluccius L. con reti da traino a Porto Santo Stefano (GR, Italia)
No full textRelationship between lengh vs. otolith lenght in Mullus barbatus L. and Trisopterus minutus capelanus in the Northern Tyrrhenian Sea
No full textContributo alla conoscenza del merluzzo cappellano, Trisopterus minutus capelanus (Lacepede, 1800) nell'Arcipelago Toscano Meridionale.
No full textPopulation structure and fishery of Parapenaeus longirostris (Lucas, 1846) in the northern Thyrrhenian Sea (western Mediterranean).
No full textRecruitment, length at first maturity and feeding of poor-cod, Trisopterus minutus capelanus (Lacepède, 1800), in the Northern Tyrrhenian Sea
No full textBottom trawl cod-end selectivity for two species of teleosts in the northern Tyrrhenian sea.
No full textAccrescimento dell'otolite in relazione alla lunghezza totale in Merluccius merluccius (L.)
No full textAge determination and growth of juveniles of the European hake, Merluccius merluccius (L., 1758), in the northern Tyrrhenian Sea (NW Mediterranean).
No full textThe aim of the present study was to provide an estimation of growth of juvenile European hake, Merluccius merluccius (L., 1758) (OSTEICHTHYES; MERLUCCIIDAE), by means of the analysis of otolith daily increments. Hake specimens were collected during trawl surveys carried out in the northern Tyrrhenian Sea (NW Mediterranean). The sagittae were removed from hakes <= 20cm total length. Left otoliths were ground and polished to obtain thin frontal sections. Otolith microstructure was analysed under a compound green light-polarising microscope. A power Curve with intercept was fitted to the length-age data to describe the growth of M. merluccius. According to the growth curve, a mean length of 18 cm was reached at the end of the first year of life. The validation of the otolith increment periodicity was performed by means of two indirect methods
Protection of fish diversity and target species: the case study of the Torre Guaceto marine protected area
No full textProtection effects on fish, and comparison of two visual-census techniques in shallow artificial rocky habitats in the northern Adriatic Sea
No full textFish assemblages associated with shallow (4-7 in deep) artificial rocky habitats (i.e. breakwaters) have been assessed between July 2002 and September 2003, at the marine protected a rea of Miramare and adjacent areas outside the reserve (northern Adriatic sea). Our purpose was to: (1) detect possible differences between 'protected vs fished' breakwaters; and (2) compare two visual-census techniques for fish assessment (i.e. strip transects vs stationary points). The fish assemblages observed between protected and fished breakwaters during all four sampling periods were statistically different. More fish taxa were found at the protected than fished breakwaters, while there was no difference in total fish density. Most fish species targeted by fisheries had a greater density (e.g. Sciaena umbra, Dicentrarchus labrax, Sparus aurata, Diplodus vulgaris, Diplodus sargus and Diplodus puntazzo) and/or size (e.g. S. aurata and D. aunularis) at the protected than fished breakwaters. There was a significant difference in fish assemblages due to assessment method. In general, the number of taxa was greater when assessed by strip transects than stationary points. fish density was almost unaffected by the method used, while total density of demersal fish (i.e. excluding schooling species) tended to be greater when evaluated by strip transects, although the difference was statistically significant only in one sampling period out of four. These results indicate that protection from fishing may have the potential to influence fish assemblages associated with breakwaters. Additionally, caution should be used when comparing fish assemblage data collected by different visual assessment techniques
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