Squalus blainvillei (Risso, 1827)

Alkusairy, Hasan & Saad, Adib, 2018, Species Composition, Diversity and Length Frequency of By-Catch Sharks from the Syrian Coast, International Journal of Research Studies in Zoology 4 (1), pp. 11-21 : 16

Squalus blainvillei

TL ranged between 28 and 78 cm for males and between 29 and 82 cm for females. Common TL ranged from 44 to 53 cm for males and from 46 to 58 cm for females. This species was presented in all months of year except December and January. Females contributed 57.3% of species catches. Its caught appeared a significant difference between seasons (X 2 = 10.800, P = 0.013), peak of season landing was in summer ( Fig. 2f ), while a peak of juveniles landing was in spring ( Fig. 3f ). Males and females of S. blainvillei matured at 46 and 56 cm TL [ 20], respectively. Therefore, about 33% of males and 71% of females were immature in species catches ( Fig. 4f ).

Figures

Figure 2. Changes of caught specimens number per season; (a) H. griseus,(b); H. perlo, (c); C. plumbeus, (d); M. mustelus (e); G. melastomus, (f); S. blainvillei, (g); C. moluccensis, (h); C. granulosus

Figure 3. Size (TL) variations of abundant and common of by-catch sharks per season off Syria coast. Males (gray), females (white): (a); H. griseus,(b); H. perlo, (c); C. plumbeus, (d); M. mustelus (e); G. melastomus, (f); S. blainvillei, (g); C. granulosus, (h); C. uyato

Figure 4. Total length (TL) frequency distributions (percent of species catch) of the abundant and common bycatch sharks off Syrian coast. Males (black), females (white). Vertical lines indicate maturity size of males (sporadic) and females (continuous) following literature: (a); H. griseus,(b); H. perlo, (c); C. plumbeus, (d); M. mustelus (e); G. melastomus, (f); S. blainvillei, (g); C. granulosus, (h); C. uyato