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Marine and Freshwater Research Marine and Freshwater Research Society
Advances in the aquatic sciences
Marine and Freshwater Research

Marine and Freshwater Research

Volume 73 Number 8 2022


Three genetic groups of Sepioteuthis spp. was identified in Japan and Taiwan. Sepioteuthis sp. 2 was dominant in Japan, whereas Sepioteuthis sp. 1 was dominant in Taiwan. Variations in life-history traits and statolith shapes of the squid were greater between geographic populations (Japan and Taiwan) than among the taxa. The results provide insights into the population structure and connectivity of Sepioteuthis spp. in the Northwest Pacific.

MF21103Age and growth of Pacific cownose ray, Rhinoptera steindachneri: a species with intermediate growth and shorter lifespan than expected

Karen A. Pabón-Aldana 0000-0002-3839-547X, Felipe N. Melo-Barrera, Xchel A. Pérez-Palafox 0000-0002-7358-0662, Andrés F. Navia 0000-0002-6758-7729, Víctor H. Cruz-Escalona 0000-0002-9878-2957 and Paola A. Mejía-Falla 0000-0003-2220-6969
pp. 1011-1024

The age and growth of the Pacific cownose ray, Rhinoptera steindachneri, were examined in the south-western region of the Gulf of California, through edge type and marginal increment analysis of 276 vertebral centra. Individual growth was described using a multi-model approach and inference. Results indicated that R. steindachneri is a batoid species with intermediate growth and a shorter lifespan than for confamilial species and even than species with similar reproductive traits.


Black dogfish off Canada undergoes a multi-year distributional shift, starting in the Laurentian Channel pupping grounds–nursery area, then spreading out along slope waters, with the largest fish being found furthest from the Channel, up to 4000 km away. No other deep demersal species are known to have a dedicated nursing ground–pupping area or to undergo a progressive migration as they grow.

MF21326Abundance, distribution and behaviour of humpback whales (Megaptera novaeangliae) along the Pacific coast of Nicaragua, Central America

Joëlle De Weerdt 0000-0003-4054-6609, John Calambokidis, Etienne Pouplard, Victoria Pouey-Santalou, Carla Patulny 0000-0001-7232-3341, Bram Vanschoenwinkel, Marc Kochzius and Phillip Clapham
pp. 1041-1055

This paper presents information on the distribution, behaviour, ecology and population size of humpback whales observed off the Pacific coast of Nicaragua. Thought to be part of the endangered humpback whale population off the Pacific coast of Central America, little is known about the population characteristics of the whales off Nicaragua. This knowledge will be valuable for scientists and decision makers to help establish effective conservation measures.


Tris(1,3-dichloro-2-propyl) phosphate (TDCIPP), as an organophosphorus flame retardant, prevails in the marine environment. This study shows that exposure to TDCIPP can adversely affect larval survival, larval growth, fecundity, and embryonic development in marine invertebrates. The results have implications for ecological risk assessment and management of organophosphorus flame retardants.

MF21141Vulnerability of 14 elasmobranchs to various fisheries in the southern Gulf of Mexico

Fátima Guadalupe Bravo-Zavala, Juan Carlos Pérez-Jiménez 0000-0002-7258-1700, Javier Tovar-Ávila 0000-0001-9095-5801 and Ana Minerva Arce-Ibarra 0000-0001-7191-1395
pp. 1064-1082

Vulnerability of elasmobranchs to multiple fisheries was estimated through the productivity and susceptibility analysis (PSA) and rebound potential method. Among sharks and rays, the silky shark, sandbar shark and scalloped hammerhead, and southern stingray and spotted eagle ray had the highest vulnerability and the lowest rebound potential. In addition, significant correlations between rebound potential and the cumulative vulnerability of the approach that averaged susceptibility attributes were estimated, indicating a general pattern in which the species’ rebound potential increases while the vulnerability decreases.

MF22049Population dynamics and dietary habits of monkey goby (Neogobius fluviatilis) in its native range in the Dnieper River basin

Alexander Didenko 0000-0002-4062-8033, Igor Buzevych, Yuriy Volikov, Alexander Gurbyk, Svitlana Kruzhylina and Vitaliy Bekh
pp. 1083-1097

The population dynamics and dietary habits of monkey goby were studied in its native range in a freshwater habitat (Dnieper River). Altogether, 70 taxa of prey organisms composed the diet of this fish, among which the most abundant were chironomid larvae, followed by cladocerans. The opportunistic feeding strategy combined with time-expanded multiple spawnings and relatively fast growth can facilitate the successive invasion and establishment of this species in new environments, and contribute to its wide distribution.


Australian glass shrimp is widely distributed along the eastern coast of Australia. This shrimp is a species complex (nine species within one). We identified presence of two hidden species (cryptic species) when we used mitochondrial DNA but there was only one species when nuclear DNA was used.

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