Acoustic tag retention rate varies between juvenile green and hawksbill sea turtles

ABSTRACT This study tested an external tag for juveniles of Lophiosilurus alexandri and measured the effects of tagging in different size classes of fishes. Experiment 1 evaluated the retention rate and influence of the tag on survival and growth of three hundred fishes divided Small, Medium and Large size classes. After 90 days of experiment the fishes had 100% survival and the tag had a higher retention rate for animals of the Large size class. Experiment 2 evaluated the tag’s influence on hematology parameters of forty-two fishes at 5, 10 and 30 days post-tagging. In this experiment both tagged and untagged animals experienced 9.4% mortality. The hematocrit was higher on the 30th day for tagged animals than for untagged animals. No difference was observed for leukocytes, plasma protein, erythrocytes and mean corpuscular volume. It was concluded from Experiment 1 that the tag reduced growth performance when applied to small sized juvenile L. alexandri, and that the tag retention rate increased with increasing animal size. Among the hematological parameters studied for juveniles on the Experiment 2 the tag only influenced the hematocrit parameters, which shows that the tag can be used without considerable influence on the hematological parameters of juvenile L. alexandri.

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Application of PIT tags for individual identification of turbot (<i>Scophthalmus maximus</i>)

Archives Animal Breeding ◽

10.7482/0003-9438-56-028 ◽

2013 ◽

Vol 56 (1) ◽

pp. 285-292 ◽

Cited By ~ 1

Author(s):

S. Oesau ◽

G. Thaller ◽

C. Schulz ◽

J. Tetens

Keyword(s):

Retention Rate ◽

Abdominal Cavity ◽

Well Being ◽

Scophthalmus Maximus ◽

Individual Identification ◽

Passive Integrated Transponder ◽

Pit Tags ◽

Tag Retention ◽

Correct Function ◽

Turbot Scophthalmus Maximus

Abstract. Passive integrated transponder (PIT) tags only work in very close proximity of the receiver (cm distance). Therefore, active transponders are mainly used in behavioural monitoring. In the present study, the effects of intraabdominal implantation of PIT tags on survival, well-being and growth performance of juvenile turbot (Scophthalmus maximus) were investigated. Furthermore, the tag retention rate and read out error rate of all tags were examined. Passive integrated transponder tags were implanted in the abdominal cavity of nearly 6 000 turbots. All tags were readout and checked for correct function over a period of 122 days every five and a half weeks. No significant effects of tagging on fish survival (mortality rate <0.2 %), health or growth were detected during the trial period. Tag retention rate was 100 % and no malfunctions were observed. Results suggest that turbots can be marked with PIT tags in the abdominal cavity without obvious negative influences on performance traits and tag retention rate.

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Coded wire tagging of juvenile curimbatá, Prochilodus lineatus (Valenciennes, 1837) (Characiformes): mortality, tag retention, and growth

Neotropical Ichthyology ◽

10.1590/1982-0224-20140074 ◽

2015 ◽

Vol 13 (2) ◽

pp. 383-388 ◽

Cited By ~ 2

Author(s):

Tatiana M. Barroca ◽

Mónica A. Gutiérrez-Espinosa ◽

Alejandro Giraldo ◽

Alessandra G. Bedore ◽

Alexandre L. Godinho

Keyword(s):

Growth Rate ◽

Retention Rate ◽

Prochilodus Lineatus ◽

Hydroelectric Reservoirs ◽

Tag Retention ◽

Absolute Growth Rate ◽

Fin Ray ◽

Short Term Mortality ◽

Absolute Growth ◽

Coded Wire Tags

In recent decades, Brazilian hydroelectric reservoirs have been stocked with hundreds of millions of juvenile migratory fish, but almost no research on stocking has been conducted. In order to study stocking it is essential to tag the fish to be stocked. In this investigation we determined handling-induced mortality, tag retention rate, and absolute growth rate of hatchery-reared juvenile curimbatá (Prochilodus lineatus) tagged with coded wire tags (CWT), a tag widely used on stocked fish. We injected CWT into the dorsal musculature just below the first dorsal fin ray. Despite the need for frequent tag injector maintenance, this tagging location proved to be suitable for tagging juvenile curimbatá. We found no short-term mortality of juvenile curimbatá handled for CWT tagging, high retention rate for CWT (≥ 98.2%) even after 174 d of tagging, and no influence on absolute growth rate by CWT. We conclude that CWT is effective at tagging juvenile curimbatá, and we expect that it will also be effective for many other Brazilian fish species used for stocking.

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Comparing tagging strategies: Effects of tags on retention rate, mortality rate and growth in hatchery-reared juvenile meagre, Argyrosomus regius (Pisces: Sciaenidae)

Scientia Marina ◽

10.3989/scimar.04583.26b ◽

2017 ◽

Vol 81 (2) ◽

pp. 171 ◽

Cited By ~ 4

Author(s):

María Del Mar Gil ◽

Miquel Palmer ◽

Amalia Grau ◽

Enrique Massutí ◽

Elena Pastor

Keyword(s):

Retention Rate ◽

Balearic Islands ◽

Fish Growth ◽

Fish Mortality ◽

Short Term ◽

Tag Retention ◽

Tag Loss ◽

Argyrosomus Regius ◽

Tank Experiment ◽

Fish Survival

The objective of this study was to compare the effectiveness of different tags (T-bar anchor tags, internal anchor tags and visible implant elastomers) implanted into juvenile meagre, Argyrosomus regius (Asso, 1801) for a restocking programme conducted in the Balearic Islands. Effectiveness was assessed in terms of tag loss, fish survival and fish growth by means of a tank experiment. The internal anchor tags showed the highest retention rate (100%), but the tagging mortality was also high (40%). The tagging mortality of T-bar tags was negligible. However, another tank experiment with different food rates showed the tag retention rate of the T-bar tag to be highly variable, ranging from 35% to 95%. In contrast with other reported results, the retention rate of visible implant elastomers was low (48%). Finally, none of the tested tags affected growth. In summary, the T-bar anchor tags showed the best trade-off between short-term tag retention and fish mortality, and seem to be the most suitable tagging method for meagre juveniles.

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Tagging juvenile seabass and sole with telemetry transmitters: medium-term effects on growth

ICES Journal of Marine Science ◽

10.1016/s1054-3139(03)00135-8 ◽

2003 ◽

Vol 60 (6) ◽

pp. 1328-1334 ◽

Cited By ~ 26

Author(s):

M.L Bégout Anras ◽

D Covés ◽

G Dutto ◽

P Laffargue ◽

F Lagardère

Keyword(s):

Growth Rate ◽

Retention Rate ◽

Dicentrarchus Labrax ◽

Fish Growth ◽

Control Fish ◽

Medium Term ◽

Tag Retention ◽

Solea Solea ◽

Tank Experiment ◽

Mesocosm Experiments

Abstract The effects of tagging with acoustic transmitters on the growth of juvenile seabass, Dicentrarchus labrax (L.) (initial mean mass±SD, 173 g ± 23.4) in a 47 d tank experiment, and sole, Solea solea (L.) (103.2 g ± 14.8) in a 72 d tank experiment and (104.0 g ± 18.4) in a 58 d salt marsh mesocosm experiment were examined. Twenty externally tagged seabass grew more slowly than the 20 with surgically implanted tags, which reached the same mass as nine control fish. Movements of the external transmitter's harness caused abrasions of the skin and loss of the tag in 60% of the cases. We thus recommend implanting transmitters for telemetry studies of juvenile seabass weighing between 120 and 214 g and carrying a tag that represents 2.2–2.5% of body mass. Both tank and mesocosm experiments conducted on juvenile sole concluded that the externally attached tag retention rate was good, but at the expense of the fish growth rate.

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