Surrogacy-led migration: reflections on the policy dilemmas

PurposeThere is abundant research on surrogacy; however, migration scholars have not addressed surrogacy-driven migration. Policies related to surrogacy and surrogacy-led migration are under-researched. The paper argues that surrogacy-led migration or fertility/reproductive migration constitutes a significant part of mainstream migration. The purpose of this paper is to reflect on the policy dilemmas in various countries.Design/methodology/approachA total of 9 surrogate mothers (4 from India; 2 from Thailand, 2 from Indonesia and 1 from Nepal) and 8 commissioning parents (2 from Japan; 4 from Europe; 1 from the USA; 1 from Australia) and 2 doctors (1 from India and 1 from Thailand) selected on snowball basis were interviewed between 2014 and 2016 by using a checklist.FindingsThe deficiency and inconsistency of laws regarding surrogacy facilitated the growth of the surrogacy market. Therefore, a uniform policy would help to define and improve the surrogacy and surrogacy-led migration management.Originality/valueThis paper demonstrates the interplay of surrogacy and mainstream migration. This is a fresh addition to the study of migration.

Fish movement patterns in a Neotropical free-flowing tributary located downstream from a large dam

In dammed rivers, the conservation of free-flowing tributaries is considered an important strategy to mitigate the negative effects of the dam on fish communities. In this study, we evaluated the importance of a free-flowing tributary of a dammed river as a reproductive migration route. From August 2012 to July 2013, hydroacoustics data were collected alongside active fish sampling using cast nets and ichthyoplankton nets in the São Francisco and Abaeté rivers. Cast net sampling captured 738 individuals and hydroacoustics detected 42196 fishes. In almost all samples and sampling sites, preferential movements to the Abaeté River and the main São Francisco River were observed. The increase in the flow rate of the Abaeté coincided with a greater incidence of fish movements to upstream areas of the tributary. A higher density and proportion of larger fishes, as well as a higher density of ichthyoplankton, were observed in the Abaeté River compared with the main river. Because this tributary is an alternative route for migratory fishes, its protection is essential for fish conservation and therefore maintenance of local fisheries

Repeated vertical movements of mature anguillid eels in a lake

Reproductive migration is a critical phase in the life history of anguillid eels. Nevertheless, fine-scale behaviours of migrating eels remain unknown, primarily due to the difficulty in attaching high-resolution recording devices to, and recovering them from, these small-sized teleosts. We attached a small accelerometer with time-scheduled release system to mature Anguilla celebesensis and A. marmorata in Lake Poso, Indonesia, during the pre-migration period. The eels repeated up-and-down movements in the water column (maximum depth, 77m), with slower, less active descents at shallower pitch angles, followed by faster, more active ascents at steeper pitch angles. The asymmetric diving pattern indicates negative buoyancy of the eels, which was confirmed by the measurements of body densities. The repeated diving is unlikely to represent foraging or thermoregulation because mature eels are thought to fast and water temperature changed little with depth. We suggest that the repeated diving is a result of the eels’ internal motivation for continuous swimming in preparation for oceanic migration, and is possibly energetically more efficient than if they keep swimming at a certain depth. The swimming energetics of eels in nature might be more complicated than previously thought because of the effect of vertical movements and non-neutral buoyancy.