29 research outputs found
Fig. 5 in Marine insects of the Maldives (Heteroptera: Gerridae, Hermatobatidae and Veliidae; Diptera: Chironomidae) with notes on taxonomy, Indo-Pacific distribution, and ecology
No full textFig. 5. Halobates germanus. Specimens collected inside Haa Alifu Atoll at night, January 2007. Scale bar = 0.5 mm. A, adult female, dorsal view (body length = 3.7 mm); B, male genitalia, dorsal view (genital segment length = 1.9 mm); C, male genitalia, ventral view (genital length = 1.5 mm).Published as part of <i>Anderson, R. Charles, Adam, M. Shiham & Cheng, Lanna, 2023, Marine insects of the Maldives (Heteroptera: Gerridae, Hermatobatidae and Veliidae; Diptera: Chironomidae) with notes on taxonomy, Indo-Pacific distribution, and ecology, pp. 478-490 in Raffles Bulletin of Zoology 71</i> on page 487, DOI: 10.26107/RBZ-2023-0035, <a href="http://zenodo.org/record/10271645">http://zenodo.org/record/10271645</a>
Halobates micans Eschscholtz 1822
No full text<i>Halobates micans</i> Eschscholtz, 1822 <p> <i>Halobates micans</i> is the only cosmopolitan species of <i>Halobates</i> and is widely distributed in the warm tropical and subtropical oceanic waters of the Atlantic, Pacific, and Indian Oceans (Herring, 1961; Cheng, 1989). It has only occasionally been found in the relatively shallow waters of the Sunda Shelf (Andersen & Cheng, 2004), including the waters around Singapore and peninsular Malaysia (Tran et al., 2015). In Maldivian waters, this species has been collected further offshore than any other marine insect species (Herring, 1961; Fig. 2C).</p>Published as part of <i>Anderson, R. Charles, Adam, M. Shiham & Cheng, Lanna, 2023, Marine insects of the Maldives (Heteroptera: Gerridae, Hermatobatidae and Veliidae; Diptera: Chironomidae) with notes on taxonomy, Indo-Pacific distribution, and ecology, pp. 478-490 in Raffles Bulletin of Zoology 71</i> on page 485, DOI: 10.26107/RBZ-2023-0035, <a href="http://zenodo.org/record/10271645">http://zenodo.org/record/10271645</a>
Population dynamics and movements of skipjack tuna (
No full textAn advection diffusion reaction model was used to estimate movement and tag attrition parameters from skipjack tuna tagging data off the Maldives. Two sets of data were available from the experiments carried out during two distinct periods: 1990–1991 and 1993–1995. The results of the analysis were compared with the previous analyses and discussed in relation to management of skipjack fisheries in the Maldives and in the Indian Ocean. The movements were found to be highly variable in space and time, and few consistent patterns were observed between the two data sets. Similarly, significantly different estimates of fishing and natural mortality rates were observed from the two data sets. These differences were found, in part, to be due to the uneven distribution of tag releases in both space and time. Estimates of movement and attrition rates show that emigration from the Maldivian fishery to the rest of the Indian Ocean’s was small. The exploitation rate was found to be substantial, contributing about 30-40% of the total attrition in the fishery area. Such levels of localized exploitation may be maintained by steady immigration from outside of the Maldives, but more extensive tagging is required to be certain. The impact of tuna fisheries elsewhere in the Indian Ocean on the domestic Maldivian fishery cannot be determined until a comprehensive large-scale tagging program, including all the fisheries in the Indian Ocean, is completed
Options for Improving dFAD Recovery and Accountability to Minimize Marine Coastal Habitat Damage and Marine Litter
Get PDFDynamics of bigeye (Thunnus obesus) and yellowfin (T. albacares) tuna in Hawaii’s pelagic fisheries: analysis of tagging data with a bulk transfer model incorporating size-specific attrition
Get PDFTag release and recapture data of bigeye (Thunnus obesus) and yellowfin tuna (T. albacares) from the Hawaii Tuna Tagging Project (HTTP) were analyzed with a bulk transfer model incorporating size-specific attrition to infer population dynamics and transfer rates between various fishery components. For both species, the transfer rate estimates from the offshore handline fishery areas to the longline fishery area were higher than the estimates of transfer from those same areas into the inshore fishery areas. Natural and fishing mortality rates were estimated over three size classes: yellowfin 20–45, 46–55, and ≥56 cm and bigeye 29–55, 56–70, and ≥71 cm. For both species, the estimates of natural mortality were highest in the smallest size class. For bigeye tuna, the estimates decreased with increasing size and for yellowfin tuna there was a slight increase in the largest size class. In the Cross Seamount fishery, the fishing mortality rate of bigeye tuna was similar for all three size classes and represented roughly 12% of the gross attrition rate (includes fishing and natural mortality and emigration rates). For yellowfin tuna, fishing mortality ranged between 7% and 30%, the highest being in the medium size class. For both species, the overall attrition rate from the entire fishery area was nearly the same. However, in the specific case of the Cross Seamount fishery, the attrition rate for yellowfin tuna was roughly twice that for bigeye. This result indicates that bigeye tuna are more resident at the Seamount than yellowfin tuna, and larger bigeye tunas tend to reside longer than smaller individuals. This may result in larger fish being more vulnerable to capture in the Seamount fishery. The relatively low level of exchange between the Sea-mount and the inshore and longline fisheries suggests that the fishing activity at the Seamount need not be of great management concern for either species. However, given that the current exploitation rates are considered moderate (10–30%), and that Seamount aggregations of yellowfin and bigeye tuna are highly vulnerable to low-cost gear types, it is recommended that further increases in fishing effort for these species be monitored at Cross Seamount
Dynamics of bigeye (Thunnus obesus) and yellowfin (T. albacares) tuna in Hawaii’s pelagic fisheries: analysis of tagging data with a bulk transfer model incorporating size-specific attrition
No full textTag release and recapture data of bigeye (Thunnus obesus) and yellowfin tuna (T. albacares) from the Hawaii Tuna Tagging Project (HTTP) were analyzed with a bulk transfer model incorporating size-specific attrition to infer population dynamics and transfer rates between various fishery components. For both species, the transfer rate estimates from the offshore handline fishery areas to the longline fishery area were higher than the estimates of transfer from those same areas into the inshore fishery areas. Natural and fishing mortality rates were estimated over three size classes: yellowfin 20–45, 46–55, and ≥56 cm and bigeye 29–55, 56–70, and ≥71 cm. For both species, the estimates of natural mortality were highest in the smallest size class. For bigeye tuna, the estimates decreased with increasing size and for yellowfin tuna there was a slight increase in the largest size class. In the Cross Seamount fishery, the fishing mortality rate of bigeye tuna was similar for all three size classes and represented roughly 12% of the gross attrition rate (includes fishing and natural mortality and emigration rates). For yellowfin tuna, fishing mortality ranged between 7% and 30%, the highest being in the medium size class. For both species, the overall attrition rate from the entire fishery area was nearly the same. However, in the specific case of the Cross Seamount fishery, the attrition rate for yellowfin tuna was roughly twice that for bigeye. This result indicates that bigeye tuna are more resident at the Seamount than yellowfin tuna, and larger bigeye tunas tend to reside longer than smaller individuals. This may result in larger fish being more vulnerable to capture in the Seamount fishery. The relatively low level of exchange between the Sea-mount and the inshore and longline fisheries suggests that the fishing activity at the Seamount need not be of great management concern for either species. However, given that the current exploitation rates are considered moderate (10–30%), and that Seamount aggregations of yellowfin and bigeye tuna are highly vulnerable to low-cost gear types, it is recommended that further increases in fishing effort for these species be monitored at Cross Seamount
Part 1: An annotated checklist of the deep demersal fishes of the Maldive Islands. Part 2: New records of fishes from the Maldive Islands,with notes on other species
No full textJ.L.B. Smith Institute of Ichthyology, Grahamstown, South Africa
Ichthyological Bulletin, Number 67, May 1998 Part 1: An annotated
checklist of the deep demersal fishes of the Maldive Islands M. Shiham
Adam, Nigel R. Merrett and R. Charles Anderson Part 2: New records of
fishes from the Maldive Islands, with notes on other species R.
Charles Anderson, John E. Randall and Rudie Kuiter Code Number:FB98001
Sizes of Files: Text: 167K Graphics: Line drawings (gif) - 26K
Photographs (jpg) - 1040.5K PART 1: AN ANNOTATED CHECKLIST OF THE DEEP
DEMERSAL FISHES OF THE MALDIVE ISLANDS ABSTRACT Adam, M.Shiham, Nigel
R. Merrett & R. Charles Anderson (1997). An annotated checklist of
the deep demersal fishes of the Maldive Islands. Icthyological Bulletin
of the J.L.B. Smith Institute of Ichthyology, No. 67 (Part 1). 1-19 pp.
We report here information on the occurrence of the deep demersal fish
species known to date from the Maldivian Exclusive Economic Zone below
a depth of 180 m. Collections of Maldivian deep demersal fishes are
held by The Natural History Museum, London (NHM); the Bernice P. Bishop
Museum, Honolulu; the Field Museum of Natural History, Chicago; the
Marine Research Section, Ministry of Fisheries and Agriculture,
Malé, Republic of Maldives; the South African Museum, Cape Town;
and the Zoological Survey of India, at the Indian Museum, Calcutta.
Specimens from all of these institutions have been studied by the
authors. In addition, the authors carried out sampling of the slope
shark fishery during March - April 1996, which resulted in a
significant new collection of shark material for the NHM. A total of
100 deep demersal species are reported here which includes 37 new
records for the Maldives. The six most speciose families are the
Macrouridae (10 species), Congridae (5), Lutjanidae (5), Squalidae (4),
Ogocephalidae (4) and Halosauridae (4). PART 2: NEW RECORDS OF FISHES
FROM THE MALDIVE ISLANDS, WITH NOTES ON OTHER SPECIES ABSTRACT
Anderson, R. Charles, John E. Randall and Rudie H. Kuiter (1998). New
records of fishes from the Maldive Islands, with notes on other
species. Ichthyological Bulletin of the J.L.B. Smith institute of
Ichthyology , No. 67, Part 2: 20-32. Seventy-eight fish species are
recorded from the Maldives for the first time. A further 30, which have
been recorded in the literature but not included in previous reviews of
Maldavian fishes, are listed. The total known shore and epipelagic fish
fauna of the Maldives now stands at 1007 species. The total known
demersal and epipelagic fish fauna is raised to 1090. Copyright 1998
J.L.B. Smith Institute of Ichthyolog
Part 1: An annotated checklist of the deep demersal fishes of the Maldive Islands. Part 2: New records of fishes from the Maldive Islands,with notes on other species
No full textJ.L.B. Smith Institute of Ichthyology, Grahamstown, South Africa
Ichthyological Bulletin, Number 67, May 1998 Part 1: An annotated
checklist of the deep demersal fishes of the Maldive Islands M. Shiham
Adam, Nigel R. Merrett and R. Charles Anderson Part 2: New records of
fishes from the Maldive Islands, with notes on other species R.
Charles Anderson, John E. Randall and Rudie Kuiter Code Number:FB98001
Sizes of Files: Text: 167K Graphics: Line drawings (gif) - 26K
Photographs (jpg) - 1040.5K PART 1: AN ANNOTATED CHECKLIST OF THE DEEP
DEMERSAL FISHES OF THE MALDIVE ISLANDS ABSTRACT Adam, M.Shiham, Nigel
R. Merrett & R. Charles Anderson (1997). An annotated checklist of
the deep demersal fishes of the Maldive Islands. Icthyological Bulletin
of the J.L.B. Smith Institute of Ichthyology, No. 67 (Part 1). 1-19 pp.
We report here information on the occurrence of the deep demersal fish
species known to date from the Maldivian Exclusive Economic Zone below
a depth of 180 m. Collections of Maldivian deep demersal fishes are
held by The Natural History Museum, London (NHM); the Bernice P. Bishop
Museum, Honolulu; the Field Museum of Natural History, Chicago; the
Marine Research Section, Ministry of Fisheries and Agriculture,
Malé, Republic of Maldives; the South African Museum, Cape Town;
and the Zoological Survey of India, at the Indian Museum, Calcutta.
Specimens from all of these institutions have been studied by the
authors. In addition, the authors carried out sampling of the slope
shark fishery during March - April 1996, which resulted in a
significant new collection of shark material for the NHM. A total of
100 deep demersal species are reported here which includes 37 new
records for the Maldives. The six most speciose families are the
Macrouridae (10 species), Congridae (5), Lutjanidae (5), Squalidae (4),
Ogocephalidae (4) and Halosauridae (4). PART 2: NEW RECORDS OF FISHES
FROM THE MALDIVE ISLANDS, WITH NOTES ON OTHER SPECIES ABSTRACT
Anderson, R. Charles, John E. Randall and Rudie H. Kuiter (1998). New
records of fishes from the Maldive Islands, with notes on other
species. Ichthyological Bulletin of the J.L.B. Smith institute of
Ichthyology , No. 67, Part 2: 20-32. Seventy-eight fish species are
recorded from the Maldives for the first time. A further 30, which have
been recorded in the literature but not included in previous reviews of
Maldavian fishes, are listed. The total known shore and epipelagic fish
fauna of the Maldives now stands at 1007 species. The total known
demersal and epipelagic fish fauna is raised to 1090. Copyright 1998
J.L.B. Smith Institute of Ichthyolog
New records of fishes from the Maldive Islands, with notes on other species
Get PDFPart 1: We report here information on the occurrence of the deep demersal fish species known to date from the Maldivian Exclusive Economic Zone below a depth of 180 m. Collections of Maldivian deep demersal fishes are held by The Natural History Museum, London (BMNH); the Bernice P. Bishop Museum, Honolulu; the Field Museum of Natural History, Chicago; the Marine Research Section, Ministry of Fisheries and Agriculture, Male, Republic of Maldives; the South African Museum, Cape Town; and the Zoological Survey of India, at the Indian Museum, Calcutta. Specimens from all of these institutions have been studied by the authors. In addition, the authors carried out sampling of the slope shark fishery during March - April 1996, which resulted in a significant new collection of shark material. A total of 99 deep demersal species are reported here which includes 36 new records for the Maldives. The six most speciose families are the Macrouridae (7 species), Congridae (5), Lutjanidae (5), Squalidae (4), Ogocephalidae (4) and Halosauridae (4).Part 2: Seventy-eight fish species are recorded from the Maldives for the first time. A further 30, which have been recorded in the literature but not included in previous reviews of Maldivian fishes, are listed. The total known shore and epipelagic fish fauna of the Maldives now stands at 1007 species. The total known demersal and epipelagic fish fauna is raised to 1090.Rhodes University Libraries (Digitisation
