Sillago suezensis,a new whiting from the northern Red Sea,and status of Sillago erythraea Cuvier (Teleostei: Sillaginidae)

The status of Sillago erythraea Cuvier in Cuvier and Valenciennes 1829 is re-examined. A lectotype designation by McKay in 1985 fixes it as a junior synonym of Sillago sihama (Forsskål in Niebuhr, 1775), which is restricted to the southern Red Sea. Northern Red Sea populations previously assigned to S. sihama or S. erythraea, are here described as Sillago suezensis sp. nov. Sillago suezensis is also distributed in the eastern Mediterranean Sea due to Lessepsian immigration through the Suez Canal. The new species is characterized within the Sillago sihama group, which has the swimbladder divided posteriorly into two tapering extensions projecting below the vertebral column extending into the tail musculature, by the absence of scales on the preopercle and on most of the opercle, a total number of 34 vertebrae, the swimbladder with lateral extensions each spreading a blind tubule anterolaterally, and a low position of the nostril.

http://www.zoobank.org/urn:lsid:zoobank.org:act:B289CDF4-AE82-44D3-9AE1-4A2B514AD348     

北部湾多鳞鱚生长与死亡参数的估算

利用2008年3-9月北部湾底拖网和刺网渔获物中采集的样本,对北部湾多鳞鱚的生长、死亡特性进行了初步研究,并利用单位补充量产量模型对多鳞鱚渔业的开发状态进行了评估。结果表明:北部湾多鳞鱚优势体长为100～130mm,占60.71%;优势体重为5～25g,占83.96%;雌性个体略大于雄性个体,性比为1:1.36,雌雄个体数量不平衡;von Bertalanffy生长方程的参数分别为:L∞=188.6mm,K=0.51,t0=-0.32;体重的生长拐点年龄为1.86龄;总死亡系数、自然死亡系数和捕捞死亡系数分别为2.58、1.217和1.36;渔业生物学参考点F0.1和Fmax的值分别为0.34和0.50,渔业资源已处于过度利用状态。     

Copepods of the genus Colobomatus (Poecilostomatoida: Philichthyidae) from fishes of the family Sillaginidae (Teleostei: Perciformes)

Six species of Colobomatus, five of which are new to science, were found in a survey of 26 species of sillaginid fishes in the Indo-west Pacific. Three of the species are closely related and occur in the head cavities of various species of their hosts. Colobomatus sillaginis West, 1983 is recorded in Sillaginodes punctata and 12 species of Sillago, from around the coast of Australia and in the Gulf of Thailand, representing many new host and locality records. Female C. asiaticus sp. nov. are described from southeast Asia and the Persian Gulf, in three species of Sillago. Female C. arabicus sp. nov. are described from two species of Sillago occurring only in the Persian Gulf. A second intrageneric grouping of three species of Colobomatus inhabits a different microhabitat: tubes of the lateral line scales. Each of these species infects several sillaginid fishes, and in contrast to members of the first species-group they are entirely allopatric with each other. In Australia, female C. fulloonae sp. nov. are described from three species of Sillago in northern waters, and female C. charleah sp. nov. are described from two species of Sillago and Sillaginodes punctata in southern waters. Female C. westi sp. nov. are described from three species of Sillago in the waters of eastern Asia (Japan, Korea and China). Only one male specimen of each of C. arabicus sp. nov., C. charleah sp. nov. and C. westi sp. nov. was found.