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  • 1
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    Some observations on the problem of marine timber destroying organisms of Indian coasts (2021)
    In:  http://aquaticcommons.org/id/eprint/16159 | 12051 | 2015-02-08 09:49:17 | 16159 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-06-29
    Description: In India the chief marine timber boring organisms are 2 species of Martesia, 28 species of shipworms, 4 species and a variety of Sphaeroma and 9 species of Limnoria besides bacteria and fungi. The occurrence, abundance and activity of the various species of borers show remarkable variations and fluctuations in the different harbours of India, each harbour or area having its own dominant set of species and an assemblage of less important forms. These species have their own characteristic preferences, life history and seasons of attachment and a scheme evolved for one locality may prove ineffective for another. Through a delicate and complex ecological adjustment the borers occurring in a locality have reached an interrelationship reducing interspecific and intraspecific competition. The seasons of settlement of the dominant borers in the different harbours of India are indicated. The need for a detailed biological enquiry is stressed.
    Keywords: Biology ; coastal waters ; wood ; boring organisms ; ecological distribution ; life history ; boring organisms ; Martesia ; Sphaeroma ; Limnoria ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 87-97
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  • 2
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    Environmental inventory and the distribution of inorganic nutrients in a tropical estuary of the south-west coast of India (2021)
    In:  http://aquaticcommons.org/id/eprint/15927 | 12051 | 2015-01-16 08:51:38 | 15927 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-11
    Description: Dissolved nutrients (PO sub(4)-P, NO sub(3)-N, NO sub(2)-N and SiO sub(4)-Si) estimated in the surface and bottom waters of five selected stations of the Paravur Lake, Kerala, India, during February 1987 to January 1988 revealed distinct seasonal variations. Rainfall and land drainage play significant roles in the nutrient economy, particularly NO sub(3)-N and SiO sub(4)-Si, of this water body. Abnormally high values of PO sub(4)-P indicated extremely polluted condition at the wetting zone of the lake during the premonsoon season. SiO sub(4)-Si showed significant negative relationship with salinity.
    Keywords: Biology ; Environment ; estuaries ; nutrients (mineral) ; seasonal variations ; temporal distribution ; distribution ; brackish ; Southern-Western India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 59-68
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  • 3
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    Biodeterioration of cellulose materials in Karingote, Nileswaram, Kavvayi and Ramapuram Backwater systems of Kerala (2021)
    In:  http://aquaticcommons.org/id/eprint/16019 | 12051 | 2015-01-24 15:23:50 | 16019 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-12
    Description: The hydrographic conditions prevailing in an estuarine system along the southwest coast of India are described. The nature of destruction of timber in these backwaters has been examined in detail which revealed the existence of 8 species of shipworms, 2 species each of pholads and isopods. The shipworms are represented by Dicyathifer manni, Lyrodus pedicellatus, Teredo furcifera, T. clappi, Nausitora dunlopei, Bankia carinata, B. campanellata; the pholads by Martesia striata and M. (Purticoma) nairi; and the isopods by Sphaeroma terebrans and S. annandalei. The incidence and relative abundance of these pests are discussed in relation to the salinity profile of the estuary.
    Keywords: Biology ; Environment ; Boring organisms ; Bankia ; Teredo ; Sphaeroma ; Martesia ; brackish ; backwaters ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 69-76
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  • 4
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    Reproductive biology of Parapenaeopsis stylifera (2021)
    In:  http://aquaticcommons.org/id/eprint/16011 | 12051 | 2015-01-24 15:01:05 | 16011 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-11
    Description: Controversy exists regarding the incidence and reproductive habits of Parapenaeopsis stylifera along the coast of Kerala, India. Results are reported of a detailed study on the different aspects of the reproductive biology based on the trawl catches landed at Neendakara Coast for a period of one year. This species breeds throughout the year with peak breeding activity in May and November. The monsoon catches consist of juveniles. Life span of the species is 2.5 years and total length at first maturity is 75 mm. Measures for the effective management of the species in the area are discussed.
    Keywords: Biology ; shrimp fisheries ; fishery biology ; Parapenaeopsis stylifera ; marine ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-12
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  • 5
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    Observations on the parasites and associates of wood boring molluscs and crustaceans of the south-west coast of India (2021)
    In:  http://aquaticcommons.org/id/eprint/18383 | 12051 | 2015-10-24 13:16:09 | 18383 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-08
    Description: An interesting assemblage of commensalic organisms ranging from Protozoa to Arthropoda has been identified from the wood boring animals (molluscs and crustaceans) from the south-west coast of India. Certain aspects of the general biology of the associated ciliates such as the nature of incidence, division in relation to environmental parameters, survival outside the body of the host and reactions related to the general condition of the host are described. Results are also presented of the tolerance of the rare commensalic hydroid Eutima commensalis to different salinities of the medium.
    Keywords: Biology ; parasites ; commensalism ; boring organisms ; Eutima commensalis ; Ciliata ; Crustacea ; Mollusca ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 65-73
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  • 6
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    Height-length relation of shells in the Indian backwater oyster Crassostrea madrasensis (Preston) of the Cochin harbour (2021)
    In:  http://aquaticcommons.org/id/eprint/18508 | 12051 | 2015-10-31 20:11:57 | 18508 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-09
    Description: Height-length relationship in Crassostrea madrasensis (Preston) showed an exponential trend and relation in the form, H=ALᴮ. Deviations of actual values from the mean values consequent to the increase in size were noticed. Height and length approximated in oysters of less than 3.5cm in height resulting in orbicular shape. In oyster of shell height 3.5cm to 8cm, increase in height is faster leading to an oval shape. Above 8cm in height, the oysters become further elongated. Height-length relation is non-linear with an index (B value) of 1.1156. A linear relationship also holds good as the B value is not very much different from unity (H=-2.5424+2.0036L).
    Keywords: Biology ; Crassostrea madrasensis ; oysters ; shells ; growth rate ; height-length relationship ; backwaters ; Cochin ; Kerala
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 27-31
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  • 7
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    Length-weight relationship in Nandus nandus (Hamilton) (Perciformes-Teleostei) (2021)
    In:  http://aquaticcommons.org/id/eprint/18819 | 12051 | 2015-11-17 17:13:00 | 18819 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-12
    Description: Length-weight relationship of the freshwater fish of Pamba River, Nandus nandus (Ham) has been worked out. The results showed that the slope values and elevations were not significant and hence a combined regression equation has been calculated for both the sexes (Log W=2.4130 Log L -0.3306). The’t’ test analyses were conducted and found that the growth departs significantly from the isometric growth. Thus the formula W=aL super(n) has to be applied in calculating the length-weight relationship of this species.
    Keywords: Biology ; Length-weight relationship ; fishery biology ; Nandus nandus ; Pamba River ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 13-14
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  • 8
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    Biology of fouling in Neendakara port, a tropical estuary in the south west coast of India (2021)
    In:  http://aquaticcommons.org/id/eprint/18360 | 12051 | 2015-10-22 05:46:11 | 18360 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-08
    Description: Species composition and some aspects of the biology of the fouling community in Neendakara port (southwest coast of India) has been examined for a period of one year. Fouling organisms were collected with a system of glass panels exposed for varying durations and during different months in the port. One species of sponge, nine species of coelenterates, thirteen species of polyzoans, four species of mud-tube dwelling polychaetes, four species of serpulids, one species each of mud-tube forming amphipod and tanaid, two species of oysters, six species of mussels and not less than eight species of tunicates were the macro fouler which settled over the panels. Monthly and seasonal settlement of the different species has been recorded. Fouling has been a continuous process occurring throughout the year in Neendakara port with slightly fluctuating biomass and considerably varying species composition. Alternate species dominance of marine and brackish water forms has been an important feature of fouling in the area. Number of species of the sedentary fouling animals represented on test panels has been high during the highly saline pre-monsoon period and low during the monsoon period.
    Keywords: Biology ; estuaries ; community composition ; harbors ; seasonal distribution ; fouling organisms ; Neendakara ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 79-94
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  • 9
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    Relation between weight and linear measurement of shell in C. madrasensis (Preston) (2021)
    In:  http://aquaticcommons.org/id/eprint/18538 | 12051 | 2015-11-04 14:48:37 | 18538 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-10
    Description: Relation of weight to height, length and breadth in the Indian backwater oyster Crassostrea madrasensis (Preston) is reported. The relative importance of the variables on weight was found to be height, length and breadth in their order of preference. The multiple regression V = -0.4017 + 0.46743 X + 0.8278 Y + 0.1130 Z can be used to estimate the meat weight (logarithm) for given dimensions of length, height and breadth (all in logarithms). An exponential relation between weight and height is also observed.
    Keywords: Biology ; length-weight relationships ; growth ; Crassostrea madrasensis ; oysters ; backwaters ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 120-124
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  • 10
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    Vertical distribution of marine wood boring and fouling organisms from the estuarine areas of the south west coast of India (2021)
    In:  http://aquaticcommons.org/id/eprint/18451 | 12051 | 2015-10-27 16:00:14 | 18451 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-09
    Description: Vertical distribution of marine wood boring and fouling organisms from three different estuarine areas namely, the Ernakulam channel in the Cochin backwaters, Ayiramthengu in the Kayamkulam Lake and Neendakara in the Asthamudi Lake during the post-monsoon, the pre-monsoon and the monsoon periods is presented. The boring organisms noticed during the present study were Martesia striata, Teredo furcifera, Nausitora hedleyi and Sphaeroma terebrans. The dominant fouling organisms were Balanus amphitrite amphitrite, calcareous worms and Modiolus sp. Algae and diatoms were very common on the sub-tidal panels during the monsoon. The incidence of Teredo, Nausitora and calcareous tube worms were significantly high on the bottom panels. Sphaeroma, Balanus and Modiolus occurred in greater numbers on the intertidal panels.
    Keywords: Biology ; estuaries ; boring organisms ; vertical distribution ; fouling organisms ; backwaters ; Ernakulam ; Ayiramthengu ; Kayamkulam Lake ; Neendakara ; Asthamudi Lake ; Cochin ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 118-125
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