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  • 1
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    Effects of Salinity on Embryonic and Early Larval Development of a Tropical Sea Urchin, Salmacis sphaeroides (2021)
    In:  http://aquaticcommons.org/id/eprint/22700 | 18721 | 2018-05-16 20:29:56 | 22700 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-09
    Description: Effects of salinity on fertilization, embryonic stage, and early larval development and growth performances of short-spined white sea urchin, Salmacis sphaeroides were conducted under a controlled laboratory condition. The experiment was carried out with seven salinity treatments (15, 20, 25, 30, 35, 40 and 45 PSU), each of which was triplicated. Significantly highest fertilization success was achieved at 30 PSU, followed by those at 25, 35, 20, 40 and 45 PSU, while the lowest value was obtained at 15 PSU, decreased with increasing and decreasing salinities (p〈.05).The time required to reach these embryonic and larval stages was increased with the salinity deviations from 30 till the extent to 25 and 35 PSU. No significant differences (p〉.05) were noted among these three salinity levels on prism larval length and width. However, significance differences (p〉.05) were noted in morphometric characters of 2-arm and 4-arm pluteus larvae. The findings of the this study indicate that S. sphaeroides is stenohaline and do not survive and develop out of the range from 25 to 35 PSU.
    Keywords: Biology ; Fisheries ; Salmacis sphaeroides ; Sea urchin ; Salinity ; Embryo ; Larvae development ; Malaysia
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 456-468
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  • 2
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    Development of breeding and fingerling production techniques for endangered long-whiskered catfish Sperata aor in captivity (2021)
    In:  http://aquaticcommons.org/id/eprint/22752 | 18721 | 2018-05-19 19:20:20 | 22752 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-09
    Description: An experiment was undertaken to develop a suitable seed production technique for Sperata aor in captivity. Naturally produced fry of aor was reared at different densities in nine nursery ponds 0.012 ha in size with an average depth of 0.8 m each. Three stocking densities tested, each of which was triplicated. Fry of aor stocked at 100,000/ha was designated as treatment-1 (T1), 150,000/ha as treatment-2 (T2) and 200,000/ha as treatment-3 (T3). All stocked fry were from the same age group with mean length and weight of 1.78 ± 0.28 cm and 0.24 ± 0.05 g, respectively. Fry in all the treatments were fed with SABINCO nursery feed (32.06% crude protein) for the first 14 days and starter-I (31.53% crude protein) for days 15 to 56. Physico-chemical parameters and plankton population of pond water were within the optimal level being better in T1 than those in T2 and T3. Growth in terms of final weight and length, weight and length gain, specific growth rate, daily growth rate, and survival of fingerlings were significantly higher in T1 followed by T2 and T3. Food conversion rate was significantly lower in T1 than in T2 and T3. Significantly higher number of fingerlings was produced in T3 than those in T2 and T1. Despite this, consistently higher net benefits were achieved from T1 than from T2 and T3. This is the first time report that stocking of 100,000 fry/ha appears to be the most suitable density for rearing of aor fingerlings in nursery ponds.
    Keywords: Biology ; Fisheries ; Sperata aor ; Fry ; Stocking density ; Fingerling ; Growth ; Production ; Genetics ; Malaysia
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-14
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  • 3
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    Embryonic, larval and juvenile development of tropical sea urchin, Diadema setosum (2021)
    In:  http://aquaticcommons.org/id/eprint/22785 | 18721 | 2018-05-22 18:06:23 | 22785 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: Diadema setosum (Leske, 1778), is one of the common echinoids widely distributed in the Indo-West Pacific Ocean, where it occurs from the Red Sea, Persian Gulf and the east coast of Africa to Japan, Australia and Malaysia. To investigate the developmental basis of morphological changes in embryos and larvae, we documented the ontogeny of D. setosum in a controlled laboratory condition at the Institute of Bioscience, Universiti Putra Malaysia, during July–September, 2012. Matured gametes were obtained from the adult individuals and the eggs fertilized at limited sperm concentration (10^-5 dilution). The obtained embryos were then reared at 24-25°C. First cleavage (2-cell), 4-cell, 8-cell, 16-cell, 32-cell and multi-cell (Morulla) stages were attained at 01.20, 02.14, 02.44, 03.09, 03.32 and 03.54 h after fertilization, respectively. Blastulae with a mean length of 111.47±1.88 µm (mean±SD) hatched 08.45 h after sperm entry. Gastrula formed 16.36 h post-fertilization and the archenteron extended constantly, while the ectodermal red-pigmented cells migrated synchronously to the apical plate. The pluteus larva started to feed unicellular algae (Chaetoceros calcitrans) in 2 d, grew continuously, and finally attained metamorphic competence within 35 d after fertilization. Induction of metamorphosis took approximately 1 h 30 min from attachment on the substratum to the complete resorption of larval tissues and the development of complete juvenile structure with adult spines, extended tubefeet and well-developed pedicellaria, the whole event usually took place within 1 d post-settlement. The newly formed juvenile (473.16 ± 6.96 µm, n=30) with a complete adult structure then grew on coralline algae to 3-month old juvenile, which represents the "sea urchin seed" for stocking in grow-out culture. This study represents the first successful investigation on embryonic, larval and early juvenile development of D. setosum. The findings would greatly be helpful towards the development of breeding and seed production techniques for aquaculture of sea urchins.
    Keywords: Aquaculture ; Biology ; Fisheries ; Sea urchin ; Diadema setosum ; Embryo ; Larva ; Juvenile ; Development ; Pulau Pangkor ; aquaculture ; Pacific Ocean ; Red Sea ; Persian Gulf ; Africa ; Japan ; Australia ; Malaysia
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 409-424
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  • 4
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    Exploration of fishing gear and fisheries diversity of Agunmukha River at Galachipa Upazila in Patuakhali District of Bangladesh (2021)
    In:  http://aquaticcommons.org/id/eprint/23011 | 18721 | 2018-06-13 21:41:00 | 23011 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-12
    Description: Agunmukha River is an important water body having plentiful aquatic resources. The fisheries communities in the river are familiar with a diverse range of fishing gear and crafts to catch fish. Therefore, the objectives of the present study were to explore fishing gear and fishing crafts, catch composition of the respective gear and identification of fish biodiversity of Agunmukha River. A step wise validated questionnaire was used for data recording from February 2015 to August 2015. In total, 19 types of fishing gear were identified under 9 major categories. On the other hand, in view of fisheries biodiversity, 47 fish species were listed covering 28 families of which Cyprinidae was found as the most dominant family which contains 9 species under 7 genera followed by Bagridae having 5 species belonging to 3 genera and Engraulidae also containing 3 species under 3 different genera. The study described 7 vulnerable, 5 endangered and 2 critically endangered species out of 42 finfish species. Diversity indexes were calculated for the present finding of which Margalef’s index (d) was 5.13 for species available in the study area. Due to unawareness and indiscriminate fish caught with a small mesh size net, diversity of fish species in the river is under threat. Thus, public awareness and adequate knowledge on use of appropriate fishing gear with appropriate mesh size could contribute to sustainable fisheries diversity in the river and the improvement in livelihood of the fishermen in the adjacent area.
    Keywords: Fisheries ; Management ; Fish biodiversity ; Fishing gears ; Fishing crafts ; Agunmukha River ; Bangladesh ; Stock assessment
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 108-126
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