Population dynamics of Melicertus kerathurus (Decapoda: Penaeidae) in Thermaikos Gulf (N. Aegean Sea)

Kevrekidis, K.; Thessalou-Legaki, M.

doi:10.1016/j.fishres.2010.10.006

Cited by 12 publications

(20 citation statements)

References 42 publications

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“…Penn 1980;Dall et al 1990). In the present study, CL 50ov = 40.70 mm corresponds approximately to a 1-year-old female (Kevrekidis and Thessalou-Legaki 2011). Dall et al (1990) stated that CL 50 depends on environmental parameters that vary with season, latitude, and depth.…”

Section: Size At Wrst Maturitysupporting

confidence: 54%

“…They represent recruits (0 + ) produced during the previous months (see Kevrekidis and Thessalou-Legaki 2011). However, the absence of mature ovarian stages in this size group excluded it from spawning activity during the reproductive …”

Section: Ovarian Stagesmentioning

confidence: 99%

“…Estimation of the exploitation rate of M. kerathurus stock in Thermaikos in the period 2000-2002 has shown that the stock was under intense Wshing pressure, tending toward overexploitation (Kevrekidis and Thessalou-Legaki 2011). In the years that followed (2006)(2007)(2008)(2009)(2010), landings declined signiWcantly from 153 mt in the period 1995-2005 to a mean of 65 mt (data from Auction Agency of Greece 2011).…”

Section: Fecunditymentioning

confidence: 99%

“…In the light of the present Wndings, both medium-and large-sized spawners are Wshed by trawlers (open Wshing period: October to May) at the beginning and the end of the reproductive period. Catches are most proWtable in October at a depth < 50 m (Kevrekidis and Thessalou-Legaki 2006) and comprise new recruits and 1 + old females (Kevrekidis and Thessalou-Legaki 2011) close to CL 50 (present study), Heldt (1938) Gulf of Tunis (Mediterranean Sea) June-July to October-November Ben Mustafa (1967) Gulf of Gabès (Mediterranean Sea) June-July to early October Ben Meriem (1993) Gulf of Cádiz (Atlantic Ocean) May-September Rodríguez (1985) South Adriatic Sea Late May to mid August (June, July) Lumare et al (2011) Southeastern Mediterranean Sea April-October (May, August, September) Abdel Razek (1985) Smyrni Bay (Central Aegean Sea) April-September (May-July) Türkmen and Yilmazyerli (2006) Gulluk Bay (Southeastern Aegean Sea) May-October (May-July) Türkmen et al (2007) mvrakikos Gulf (Ionian Sea) May-August (May, August) Klaoudatos et al (1992) mvrakikos Gulf (Ionian Sea) Late April to late September (August) Conides et al (2008) Thermaikos Gulf (North Aegean Sea) Late April to mid-October (June, July) Present study while they are minimal in May due to reproductive migration inshore. Thus, an issue arises concerning the advent of each trawling season (October) and/or the allowable trawling depth/distance from the shore, in the same month, as it has been shown that the period of high catch rates is signiWcantly related to depth (Kevrekidis and Thessalou-Legaki 2006).…”

Section: Fecunditymentioning

confidence: 99%

“…Rodrígeuz 1977;Scordella and Lumare 2001;Kevrekidis and Galil 2003;Can et al 2004;Galil 2007;Kevrekidis 2009). Thus, species-speciWc initiatives toward sustainable management of this resource should be implemented (Kevrekidis and Thessalou-Legaki 2011).…”

Section: Introductionmentioning

confidence: 99%

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Reproductive biology of the prawn Melicertus kerathurus (Decapoda: Penaeidae) in Thermaikos Gulf (N. Aegean Sea)

Kevrekidis

Thessalou-Legaki

2012

Helgol Mar Res

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The reproductive biology including insemination frequency, ovarian maturation, gonadosomatic index (GSI), size at Wrst maturity, and fecundity of Melicertus kerathurus were investigated using monthly samples from Thermaikos Gulf. Insemination was recorded by the presence of a spermatophore in the thelycum, and ovarian development was based on macroscopic ovarian staging (ST1-ST5). Inseminated females were found throughout the year with high percentages recorded from April to July. Although all ovarian stages were represented in mated females, insemination increased with size and ovarian maturation. High percentages of vitellogenic or mature ovarian stages were observed from May to July, while immature and developing ovaries were predominant mainly in winter. Spawned ovaries occurred from May to October. Carapace length at Wrst maturity based on the presence of a spermatophore (CL 50sp ) was estimated at 39.20 mm, while that based on the presence of vitellogenic and mature ovaries (CL 50ov ) at 40.70 mm. The seasonal peak in the proportion of mature females (ST4) varied with size. Inseminated females at ST4 and GSI peaked in June-July. GSI varied in relation to insemination status and ovarian stage. In large females (>50 mm CL), the decline in mature ovaries and GSI increment with size indicates a relative reduction in the reproductive output. The number of oocytes ranged from 62,742 to 602,947 (mean § SD: 268,000 § 113,000). As the prawns are targeted during the spawning season, mainly by the artisanal Wshery, and female size at Wrst maturity is selected by artisanal net size, managerial measures toward artisanal Wshery should be implemented.

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Section: Size At Wrst Maturitysupporting

confidence: 54%

Section: Ovarian Stagesmentioning

confidence: 99%

Section: Fecunditymentioning

confidence: 99%