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Shell morphometric relationships of the most common bivalve species (Mollusca: Bivalvia) of the Algarve coast (southern Portugal)
TLDR
This study reports shell morphometric relationships (height/length and width/length) for the most common and abundant bivalve species of the Algarve coast (southern Portugal) and several ecological hypotheses or explanations were formulated for the distinct types of growth exhibited by different bivalves.
Weight–length relationships for 50 selected fish species of the Algarve coast (southern Portugal)
TLDR
The first references on weight–length relationships for six fish species worldwide are presented, for 15 species for the northeastern Atlantic, for 20 species for Portuguese waters and for 25species for the Algarve coast (southern Portugal).
Weight–length relationships of 25 bivalve species (Mollusca: Bivalvia) from the Algarve coast (southern Portugal)
Weight–length relationships of some of the most abundant bivalve species from the Algarve coast (southern Portugal) captured during several exploratory fishing surveys carried out during 2000 on a
Depth segregation phenomenon in Donax trunculus (Bivalvia: Donacidae) populations of the Algarve coast (southern Portugal)
A study was undertaken to evaluate the existence of depth segregation between size classes of Donax trunculus populations that occur along the Algarve coast (southern Portugal). Five collecting areas
Reproductive cycle and biochemical composition of Hexaplex trunculus (Gastropoda: Muricidae) from Bizerte lagoon, northern Tunisia
TLDR
The gonad developmental stages and the gonadosomatic index indicated that H. trunculus apparently has an annual reproductive cycle with extended periods of gonadal activity, and the contents of protein, lipids and carbohydrates were invariably greater in the gonads than in the foot, confirming the key role of the reproductive tissues in energetic storage.
Size matters: importance of penis length variation on reproduction studies and imposex monitoring in Bolinus brandaris (Gastropoda: Muricidae)
The present study aimed at analysing the monthly variation in penis length (PL) during the reproductive cycle of the purple dye murex (Bolinus brandaris). Two hypotheses were tested: PL variation
AGE AND GROWTH OF CHAMELEA GALLINA FROM THE ALGARVE COAST (SOUTHERN PORTUGAL): INFLUENCE OF SEAWATER TEMPERATURE AND GAMETOGENIC CYCLE ON GROWTH RATE
TLDR
The analysis of acetate peels showed that periods of major growth occurred between December and July, and slower growth periods were registered at the beginning of autumn, especially in October, when all individuals of the population showed narrow growth increments associated with a cleft in the shell ventral margin.
Comparison of indices for the assessment of reproductive activity in Hexaplex trunculus (Gastropoda: Muricidae)
TLDR
Compared to conventional indices, the visual quantitative indices (GSI and CGI) followed seasonal variations of the species reproductive cycle and identified broad changes in reproductive development (being highly accurate in detecting the main period of gonad maturation and spawning that occurred between May and June).
The artisanal fishery for muricid gastropods (banded murex and purple dye murex) in the Ria Formosa lagoon (Algarve coast, southern Portugal)
The artisanal fishery for muricid gastropods in the Ria Formosa lagoon (Algarve coast, southern Portugal) is a locally important fishing activity because the banded murex ( Hexaplex trunculus ) and
Gametogenic cycle of Hexaplex (Trunculariopsis) trunculus (Gastropoda: Muricidae) in the Ria Formosa lagoon (Algarve coast, southern Portugal)
TLDR
A closed season in the fishing activity should be implemented during the main spawning period of T. trunculus (May and June), in order to protect the female broodstock and collective spawns.
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