Tuesday, 24 March 2026

Letter from the conservation front line for spiny butterfly ray

 


First published in Animal Conservation: 17 July 2024, 
 


In the 19th century, frequent landings of spiny butterfly ray were reported in the Adriatic Sea (Kolombatovic, 1886); however, through the 20th century, records of such landings nearly disappeared (Dulcic et al., 2003). There were no records in this century until a large gravid female was recently described in Vlore, Albania, marking the first record of a gravid female in the northern Mediterranean (Gajic et al., 2023). The subsequent systematic research conducted by the authors in Vlore led to five new findings between 2022 and 2024. Another gravid female (153-cm DW, 24.9-kg TW) bearing seven latestage fetuses, together with an adult male (103 cm DW and 8.15 kg TW) and a juvenile male (63-cm DW, 2-kg TW), were recorded off Zvernec, Sazan Island, and Vjose Delta, at the depths of 25 to 30 meters. Local ecological knowledge provided one additional record in 2022, and another one from 2016

Research activities at Sharklab ADRIA

The study was gratefully funded by the Mohamed bin Zayed Species Conservation Fund (Project no.: 232532379). Additionally, we are grateful to all our partners, particularly in Albania, for their invaluable assistance during field surveys. During the study, the authors solely observed the catch and conducted interviews with local fishermen. They were in no way involved in or interfered with any fishing activities.



Friday, 2 July 2021

A new species of giant guitarfish recorded from Bay of Bengal, Bangladesh

Yang researcher Md Jayedul Islam recorded a new species of giant guitarfish, Glaucostegus younholeei sp. nov., with his teacher that is described from 13 specimens, 730933 mm total length, collected from fish landing center of Bangladesh Fisheries Development Corporation in Cox's Bazar district of Bangladesh. The new species is distinguished from congeners in having the following combination of characters: Body brownish or greyish in color with a narrowly wedge-shaped disc, and long narrow bluntly pointed snout (angle 3140°), and broad oblique nostrils with the narrow anterior opening. Nostrils about half of the mouth width, subequal (0.981.33) to internasal width; ~5557 nasal lamellae; anterior nasal flaps slightly penetrating into internasal space, their interspace 2.20 2.61 in length of the posterior nasal aperture. Orbit very small in adults, diameter 8.1911.62 in preorbital length, 2.252.69 in interorbital space. Rostral ridges almost joined along their entire length; margin of cranium sharply demarcated before eyes. Spiracular folds very short and widely separated. Skin rough, densely covered with small denticles, more coarsely granular on the dorsal surface than ventrally, enlarged between orbits and in a distinct band between nape and first dorsal fin. Tail relatively longer, length 1.151.48 in disc length; dorsal fins narrowly spaced, interspace 1.322.11 in base length of the first dorsal fin. Clasper length in adult male 4.375.70 in total length. Phylogenetic analysis of DNA barcode sequences also shows the clear divergence of Glaucostegus younholeei from other congeneric species obtained from GenBank. A key is provided to the 8 known members including new species of the genus Glaucostegus.

                                                Giant guitarfish (Glaucostegus younholeei sp.)

Citation : Habib KA, Islam MJ. Description of a new species of giant guitarfish, Glaucostegus younholeei sp. nov. (Rhinopristiformes: Glaucostegidae) from the northern Bay of Bengal, Bangladesh. Zootaxa. 2021 Jun 29;4995(1):129-146. doi: 10.11646/zootaxa.4995.1.7. PMID: 34186813.