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Pre-print Volume –Posters NECTON AND FISHERY COMMITEE habitat, a decrease in oxygen concentration (down to 2.19 mg/l), a sharp increase in aquatic temperature (from 23.0 ºC at the end of May to over 33.0 ºC by the end of August) and a decrease in the depth of the water (50% decrease in water depth at the Ghadira wetland and a 25% decrease at Simar). Females were more abundant than males at both sites (3:1 at Ghadira and 2:1 at Salina, Zammit-Mangion et al, in press), with the overall number of males at the Ghadira site decreasing by 8.8% as the summer progressed. The results also showed that a significant number of the population were juveniles (75% and 46.3% of the populations at Ghadira and Simar respectively) (Zammit-Mangion et al., in press). At the Ghadira site, juvenile abundances peaked in August, with juveniles exhibiting a fairly uniform mean size (mean length=26.3 mm, +/-1.8 mm). At Simar, the juvenile abundances peaked in June, exhibiting a mean length of 21.5 mm (+/-2.6 mm). Juvenile mortality was high, with juveniles showing sharp declines in abundance by the end of summer, with over 80% and 60% decline in juveniles at Ghadira and Simar, respectively. Abiotic stress during late July and early August had a negative effect on reproductive success, on the number of males recorded at Ghadira and on reproductive activity. However, once the water temperature decreased, and dissolved oxygen increased, the female killifish individuals resumed reproductive effort, with 33% of females studied in October at the Ghadira site exhibiting the swollen bellies characteristic of pregnant fish. No signs of pathogenesis were found on the particular sampling days. Conclusions - This study indicated that the two A. fasciatus populations at the two wetlands, especially at the Ghadira site, were exposed to extreme abiotic conditions during the peak summer months. These factors, coupled with the physical and genetic isolation of the two populations, constitute perennial constraints to the long-term viability of the species and justify the need for a constantly high conservation priority being assigned to the species. The authors propose that targeted management measures should be adopted immediately if the populations at the two wetlands are to be effectively conserved. These include i) increasing protective measures during the reproductive and recruitment periods through late March to May ii) starting a reintroduction programme at sites previously known to support Aphanius species (strictly monitoring the haplotypes of introduced individuals) and iii) introducing a water monitoring programme. References WILDEKAMP R.H. (1993) - The genus Aphanius Nardo. In: Watters B.R. (ed), A World of killies, atlas of the oviparous cyprinodontiform Fishes of the world, Vol I. American Killifish Association, Hishawaka Indiana: 19–67. ZAMMIT-MANGION M., GAUCI M., GAUCI C. (in press) - Studies on the Biology of Aphanius fasciatus at the Ghadira wetland in the Maltese Islands. Proceedings of the 39 th CIESM Congress, Venice, Italy, 10-14 th May 2010. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 329
Pre-print Volume –Posters NECTON AND FISHERY COMMITEE B. ZAVA, F. FIORENTINO* Wilderness studi ambientali, Palermo, Italia. *CNR-IAMC UOS di Mazara del Vallo (TP), Italia. fabio.fiorentino@iamc.cnr.it CATTURE DEL RONDONE DI MARE CHEILOPOGON HETERURUS (RAFINESQUE, 1810) (OSTHEICHTHYES, EXOCETIDAE) IN UN’AREA MARINA PROTETTA LUNGO LE COSTE SETTENTRIONALI DELLA SICILIA CATCHES OF FLYING FISH CHEILOPOGON HETERURUS (RAFINESQUE, 1810) (OSTHEICHTHYES, EXOCETIDAE) INSIDE A MARINE PROTECTED AREA OFF THE NORTHERN SICILIAN COAST Abstract – The size structure, length weight relationship and gonado somatic index of specimens of Cheilopogon heterurus caught by an artisanal fishery targeting pelagic fishes in the MPA “Capo Gallo- Isola delle Femmine” (Northern Sicily) were presented. The catch was exclusively formed by adult and mature specimens with size. close to the maximum reported for the species. Key-words: Cheilopogon heterurus, MPA, southern Tyrrhenian, artisanal fisheries, size structure, maturity. Introduzione – Il rondone di mare Cheilopogon heterurus (Rafinesque, 1810) è una specie subtropicale ed epipelagica che frequenta le acque costiere nella tarda primavera-estate in occasione della riproduzione. La marineria di Isola delle Femmine sita nella Area Marina Protetta “Capo Gallo-Isola delle Femmine”, effettua una pesca tradizionale con due attrezzi da posta chiamati “pusticedda” e “palamitara” che combinano i vantaggi del tramaglio e della schietta. Le due reti, che differiscono esclusivamente per la larghezza della maglia, hanno come principale bersaglio individui adulti e maturi di specie pelagiche come la palamita Sarda sarda, il tonnetto Euthynnus alletteratus, l’aguglia maggiore Tylosurus acus imperialis ed il rondone di mare Cheilopogon heterurus (Fiorentino e Zava, 2007). In questa nota sono riportate le informazioni salienti sulla caratteristiche biologiche degli esemplari di Cheilopogon heterurus raccolti con i suddetti attrezzi di pesca. Materiali e metodi - Quarantasette individui di C. heterurus sono stati raccolti presso la marineria di Isola delle Femmine nei mesi di giugno 2006 e giugno-luglio 2007. Trasportati in laboratorio gli esemplari sono stati misurati (LT, cm) e pesati (PT = peso totale, g; PS = peso somatico, g). Inoltre, sono stati inoltre rilevati il sesso, l’aspetto ed il peso delle gonadi (PG, g). L’indice gonado somatico è stato calcolato come IGS = PG/(PS-PG)*100, con PS=PT-PG. Risultati e conclusioni – La distribuzione in taglia degli individui campionati è riportata in Fig. 1. Il range di taglia (LT) è stato 35-39 cm nei maschi e 34-41 cm nelle femmine. I parametri della relazione taglia-peso a sessi combinati sono risultati a=0,0022 e b=3,2735, con r 2 =0,8301. Le gonadi apparivano in avanzato stato di maturazione. In particolare dieci femmine presentavano uova idratate distribuite su lunghe striature longitudinali e ben visibili attraverso la tunica ovarica (IGS medio delle femmine con uova idratate =18,68±4,87. Nessun maschio fluente è stato osservato nel campione. Le taglie e la condizione di maturità rilevate evidenziano che 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 330
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